USRE37751EExpiredUtility
Apparatus and method for transient suppression in synchronous data detection systems
Est. expiryApr 28, 2017(expired)· nominal 20-yr term from priority
Inventors:Pantas Sutardja
G11B 20/10009G11B 20/10055G11B 20/1403
67
PatentIndex Score
6
Cited by
6
References
72
Claims
Abstract
Disclosed is a method for transient suppression in synchronous data protection systems which includes high-pass filtering of the signal produced by the sampling and shaping circuits before the signal enters the timing and gain control circuits. This high-pass filtering may be turned on when a transient is detected, in anticipation of a previously detected transient, or may be always on. Using the high-pass version of the shaped signal allows the timing loop and the gain loop to function during a transient interval, thus maintaining timing and gain lock during such an interval.
Claims
exact text as granted — not AI-modifiedWhat is claimed is:
1. An apparatus for suppression of transients in a synchronous data detection system comprising:
an analog front-end circuit receiving an analog signal and outputting an amplified signal;
a sampler receiving the amplified signal and outputting a sampled signal;
a shaping circuit receiving the sampled signal and outputting a shaped signal;
a data detector receiving the shaped signal and detecting data in the shaped signal;
a first high-pass filter receiving the shaped signal and outputting a high-pass signal;
a gain control circuit receiving the high-pass signal and controlling the analog front-end circuit using the high-pass signal; and
a timing control circuit receiving the high-pass signal and controlling the sampler and the shaping circuit using the high-pass signal.
2. The apparatus in claim 1 , wherein the first high-pass filter is bypassable.
3. The apparatus in claim 2 , further comprising An apparatus for suppression of transients in a synchronous data detection system comprising:
an analog front - end circuit receiving an analog signal and outputting an amplified signal;
a sampler receiving the amplified signal and outputting a sampled signal;
a shaping circuit receiving the sampled signal and outputting a shaped signal;
a data detector receiving the shaped signal and detecting data in the shaped signal;
a first high - pass filter receiving the shaped signal and outputting a high - pass signal, wherein the first high - pass filter is bypassable;
a gain control circuit receiving the high - pass signal and controlling the analog front - end circuit using the high - pass signal;
a timing control circuit receiving the high - pass signal and controlling the sampler and the shaping circuit using the high - pass signal; and
a transient detector receiving the sampled signal and using the sampled signal to control bypassing of the first high-pass filter.
4. The apparatus in claim 3 , wherein the first high-pass filter is switched on when a transient is detected by the transient detector.
5. The apparatus in claim 3 , wherein the first high-pass filter is switched on in anticipation of a transient that was previously detected by the transient detector.
6. The apparatus in claim 1 , wherein the analog front-end circuit comprises a variable gain amplifier (VGA).
7. The apparatus in claim 6 , wherein the analog front-end further comprises a second high-pass filter.
8. The apparatus in claim 7 , wherein the second high-pass filter is bypassable.
9. The apparatus in claim 1 , wherein the sampler comprises an analog-to-digital converter.
10. The apparatus in claim 1 , wherein the sampler comprises a sample-and-hold circuit.
11. The apparatus in claim 1 , wherein the shaping circuit comprises a finite impulse response (FIR) filter.
12. The apparatus in claim 1 , wherein the data detector comprises a maximum-likelihood sequence detector.
13. The apparatus in claim 1 , further comprising a voltage controlled oscillator (VCO) receiving a voltage input from the timing control circuit and outputting an oscillating signal to the sampler and the shaping circuit.
14. A method for robust data detection in a synchronous data detection system comprising:
receiving a signal including a transient in a baseline of the signal;
amplifying the signal under control of a gain control signal to form an amplified signal;
sampling the amplified signal under control of a timing control signal to form a sampled signal;
shaping the sampled signal under control of the timing control signal to form a shaped signal;
recovering data from the shaped signal;
high-pass filtering the shaped signal to form a high-pass version of the shaped signal;
generating the gain control signal using the high-pass version of the shaped signal; and
generating the timing control signal using the high-pass version of the shaped signal.
15. An apparatus for suppression of transients in a synchronous data detection system comprising:
an analog front - end circuit receiving an analog signal and outputting an amplified signal;
a sampler receiving the amplified signal and outputting a sampled signal;
a data detector responsive to the sampled signal to detect data therein;
a first high - pass filter responsive to the sampled signal and outputting a high - pass signal;
a gain control circuit receiving the high - pass signal and controlling the analog front - end circuit using the high - pass signal; and
a timing control circuit receiving the high - pass signal and controlling the sampler in accordance with the high - pass signal.
16. The apparatus in claim 15 , wherein the first high- pass filter is bypassable.
17. The apparatus in claim 15 , wherein the analog front- end circuit comprises a variable gain amplifier ( VGA ) .
18. The apparatus in claim 17 , wherein the analog front- end further comprises a second high - pass filter.
19. The apparatus in claim 18 , wherein the second high- pass filter is bypassable.
20. The apparatus in claim 15 , wherein the sampler comprises an analog- to - digital converter.
21. The apparatus in claim 15 , wherein the sampler comprises a sample- and - hold circuit.
22. The apparatus in claim 15 , wherein the data detector comprises a maximum- likelihood sequence detector.
23. The apparatus in claim 15 , further comprising a voltage controlled oscillator ( VCO ) receiving a voltage input from the timing control circuit and outputting an oscillating signal to the sampler.
24. An apparatus for suppression of transients in a synchronous data detection system comprising:
an analog front - end circuit receiving an analog signal and outputting an amplified signal;
a sampler receiving the amplified signal and outputting a sampled signal;
a data detector responsive to the sampled signal to detect data therein;
a first high - pass filter responsive to the sampled signal and outputting a high - pass signal, wherein the first high - pass filter is bypassable;
a gain control circuit receiving the high - pass signal and controlling the analog front - end circuit using the high - pass signal;
a timing control circuit receiving the high - pass signal and controlling the sampler in accordance with the high - pass signal; and
a transient detector responsive to the sampled signal to control bypassing of the first high - pass filter.
25. The apparatus in claim 24 , wherein the first high- pass filter is switched on when a transient is detected by the transient detector.
26. The apparatus in claim 24 , wherein the transient detector controls said analog front end circuit.
27. The apparatus in claim 24 , wherein the first high- pass filter is switched on in anticipation of a transient that was previously detected by the transient detector.
28. A method for data detection in a synchronous data detection system comprising:
a. receiving a signal including a transient component;
b. amplifying the signal under control of a gain control signal to form an amplified signal;
c. sampling the amplified signal under control of a timing control signal to form a sampled signal;
d. recovering data from the sampled signal;
e. high - pass filtering the sampled signal to form a high - pass version of the sampled signal;
f. generating the gain control signal using the high - pass version of the sampled signal; and
g. generating the timing control signal using the high - pass version of the sampled signal.
29. The method of claim 28 further comprising the step of:
ff. high - pass filtering the amplified signal.
30. The method of claim 29 , further comprising the step of:
gg. bypassing step ff.
31. A method for data detection in a synchronous data detection system comprising:
a. receiving a signal including a transient component;
b. amplifying the signal under control of a gain control signal to form an amplified signal;
c. sampling the amplified signal under control of a timing control signal to form a sampled signal;
d. recovering data from the sampled signal;
e. high - pass filtering the sampled signal to form a high - pass version of the sampled signal;
f. generating the gain control signal using the high - pass version of the sampled signal;
g. generating the timing control signal using the high - pass version of the sampled signal; and
h. detecting a transient in step c; and
i. bypassing step e in response to step h.
32. The method of claim 31 , wherein step i further comprises bypassing step e when a transient is detected in step h.
33. The method of claim 32 , wherein step i further comprises bypassing step e when a transient is anticipated that was previously detected in step h.
34. An apparatus for suppression of transients in a synchronous data detection system comprising:
an analog front - end circuit receiving an analog signal and outputting an amplified signal;
a sampler receiving the amplified signal and outputting a sampled signal;
a shaping circuit receiving the sampled signal and outputting a shaped signal;
a data detector receiving the shaped signal to detecting data therein;
a first high - pass filter receiving the shaped signal and outputting a high - pass signal; and
a timing control circuit receiving the high - pass signal and controlling the sampler and the shaping circuit using the high - pass signal.
35. The apparatus in claim 34 , wherein the first high- pass filter is bypassable.
36. The apparatus in claim 34 , wherein the analog front- end circuit comprises a variable gain amplifier ( VGA ) .
37. The apparatus in claim 36 , wherein the analog front- end further comprises a second high - pass filter.
38. The apparatus in claim 37 , wherein the second high- pass filter is bypassable.
39. The apparatus in claim 34 , wherein the sampler comprises an analog- to - digital converter.
40. The apparatus in claim 34 , wherein the sampler comprises a sample- and - hold circuit.
41. The apparatus in claim 34 , wherein the data detector comprises a maximum- likelihood sequence detector.
42. The apparatus in claim 34 , further comprising a voltage controlled oscillator ( VCO ) receiving a voltage input from the timing control circuit and outputting an oscillating signal to the sampler.
43. The apparatus in claim 34 , wherein the shaping circuit comprises a finite impulse response ( FIR ) filter.
44. An apparatus for suppression of transients in a synchronous data detection system comprising:
an analog front - end circuit receiving an analog signal and outputting an amplified signal;
a sampler receiving the amplified signal and outputting a sampled signal;
a shaping circuit receiving the sampled signal and outputting a shaped signal;
a data detector receiving the shaped signal to detecting data therein;
a first high - pass filter receiving the shaped signal and outputting a high - pass signal, wherein the first high - pass filter is bypassable;
a timing control circuit receiving the high - pass signal and controlling the sampler and the shaping circuit using the high - pass signal; and
a transient detector responsive to the sampled signal to control bypassing of the first high - pass filter.
45. The apparatus in claim 44 , wherein the first high- pass filter is switched on when a transient is detected by the transient detector.
46. The apparatus in claim 44 , wherein the transient detector controls said analog front end circuit.
47. The apparatus in claim 44 , wherein the first high- pass filter is switched on in anticipation of a transient that was previously detected by the transient detector.
48. A method for data detection in a synchronous data detection system comprising:
a. receiving a signal including a transient component;
b. amplifying the signal under control of a gain control signal to form an amplified signal;
c. sampling the amplified signal under control of a timing control signal to form a sampled signal;
d. shaping the sampled signal under control of the timing control signal to form a shaped signal;
e. recovering data from the shaped signal;
f. high - pass filtering the shaped signal to form a high - pass version of the shaped signal; and
g. generating the timing control signal using the high - pass version of the shaped signal.
49. The method of claim 48 , further comprising the step of:
yy. high - pass filtering the amplified signal.
50. The method of claim 49 , further comprising the step of:
zz. bypassing step yy.
51. A method for data detection in a synchronous data detection system comprising:
a. receiving a signal including a transient component;
b. amplifying the signal under control of a gain control signal to form an amplified signal;
c. sampling the amplified signal under control of a timing control signal to form a sampled signal;
d. shaping the sampled signal under control of the timing control signal to form a shaped signal;
e. recovering data from the shaped signal;
f. high - pass filtering the shaped signal to form a high - pass version of the shaped signal;
g. generating the timing control signal using the high - pass version of the shaped signal;
h. detecting a transient in step c; and
i. bypassing step f in response to step h.
52. The method of claim 51 , wherein step i further comprises bypassing step e when a transient is detected in step h.
53. The method of claim 51 , wherein step i further comprises bypassing step e when a transient is anticipated that was previously detected in step h.
54. An apparatus for suppression of transients in a synchronous data detection system comprising:
an analog front - end circuit receiving an analog signal and outputting an amplified signal;
a sampler receiving the amplified signal and outputting a sampled signal;
a shaping circuit receiving the sampled signal and outputting a shaped signal;
a data detector receiving the shaped signal and detecting data in the shaped signal;
a first high - pass filter receiving the shaped signal and outputting a high - pass signal; and
a gain control circuit receiving the high - pass signal and controlling the analog front - end circuit using the high - pass signal.
55. The apparatus in claim 54 , wherein the first high- pass filter is bypassable.
56. The apparatus in claim 54 , wherein the analog front- end circuit comprises a variable gain amplifier ( VGA ) .
57. The apparatus in claim 56 , wherein the analog front- end further comprises a second high - pass filter.
58. The apparatus in claim 57 , wherein the second high- pass filter is bypassable.
59. The apparatus in claim 54 , wherein the sampler comprises an analog- to - digital converter.
60. The apparatus in claim 54 , wherein the sampler comprises a sample- and - hold circuit.
61. The apparatus in claim 54 , wherein the data detector comprises a maximum- likelihood sequence detector.
62. The apparatus in claim 54 , wherein the shaping circuit comprises a finite impulse response ( FIR ) filter.
63. An apparatus for suppression of transients in a synchronous data detection system comprising:
an analog front - end circuit receiving an analog signal and outputting an amplified signal;
a sampler receiving the amplified signal and outputting a sampled signal;
a shaping circuit receiving the sampled signal and outputting a shaped signal;
a data detector receiving the shaped signal and detecting data in the shaped signal;
a first high - pass filter receiving the shaped signal and outputting a high - pass signal, wherein the first high - pass filter is bypassable;
a gain control circuit receiving the high - pass signal and controlling the analog front - end circuit using the high - pass signal; and
a transient detector responsive to the sampled signal to control bypassing of the first high - pass filter.
64. The apparatus in claim 63 , wherein the first high- pass filter is switched on when a transient is detected by the transient detector.
65. The apparatus in claim 63 , wherein the first high- pass filter is switched on in anticipation of a transient that was previously detected by the transient detector.
66. The apparatus in claim 63 , wherein the transient detector controls said analog front end circuit.
67. A method for data detection in a synchronous data detection system comprising:
a. receiving a signal including a transient component;
b. amplifying the signal under control of a gain control signal to form an amplified signal;
c. sampling the amplified signal under control of a timing control signal to form a sampled signal;
d. shaping the sampled signal under control of the timing control signal to form a shaped signal;
e. recovering data from the shaped signal;
f. high - pass filtering the shaped signal to form a high - pass version of the shaped signal; and
g. generating the gain control signal using the high - pass version of the shaped signal.
68. The method of claim 67 , further comprising the step of:
j. high - pass filtering the amplified signal.
69. The method of claim 68 , further comprising the step of:
k. bypassing step j.
70. A method for data detection in a synchronous data detection system comprising:
a. receiving a signal including a transient component;
b. amplifying the signal under control of a gain control signal to form an amplified signal;
c. sampling the amplified signal under control of a timing control signal to form a sampled signal;
d. shaping the sampled signal under control of the timing control signal to form a shaped signal;
e. recovering data from the shaped signal;
f. high - pass filtering the shaped signal to form a high - pass version of the shaped signal;
g. generating the gain control signal using the high - pass version of the shaped signal;
h. detecting a transient in step c; and
i. bypassing step f in response to step h.
71. The method of claim 70 , wherein step i further comprises bypassing step e when a transient is detected in step h.
72. The method of claim 70 , wherein step i further comprises bypassing step e when a transient is anticipated that was previously detected in step h.Join the waitlist — get patent alerts
Track USRE37751E — get alerts on status changes and closely related new filings.
We store only your email — no account needed. See our privacy policy.