Method and system for filter calibration using fractional-n frequency synthesized signals

Abstract

A method and system for filter calibration using fractional-N frequency synthesized signals are presented. Aspects of the method may include generating an LO signal by a PLL circuit within a chip. A reference signal may be generated based on the generated LO signal and a synthesizer control signal. A frequency response for a filter circuit integrated within the chip may be calibrated by adjusting parameters associated with the filter circuit based on the generated LO signal. Aspects of the system may include a single-chip multi-band RF receiver that enables generation of a LO signal by a PLL circuit within the single-chip, and enables calibration of a frequency response for a filter circuit integrated within the chip. A reference signal may be generated based on the generated LO signal and a synthesizer control signal. The frequency response may be calibrated by adjusting the filter based on the generated reference signal.

1 - 24 . (canceled) 
   
   
       25 . A method for processing information in a wireless communication system, the method comprising:
 generating a test signal within a single-chip multi-band RF receiver;   generating a filter control signal within said single-chip multi-band RF receiver; and   calibrating a frequency response for a filter circuit integrated within said single-chip multi-band RF receiver, by adjusting said filter circuit based on one or both of said test signal and said filter control signal.   
   
   
       26 . The method according to  claim 25 , comprising generating, within said single-chip multi-band RF receiver, an attenuated test signal by attenuating said test signal. 
   
   
       27 . The method according to  claim 25 , comprising generating, within said single-chip multi-band RF receiver, a filtered test signal based on filtering of said test signal by said filter circuit. 
   
   
       28 . The method according to  claim 27 , comprising comparing, within said single-chip multi-band RF receiver, an attenuated test signal and said filtered test signal. 
   
   
       29 . The method according to  claim 28 , comprising computing, within said single-chip multi-band RF receiver, an average for one or both of said attenuated test signal and said filtered test signal, prior to said comparing. 
   
   
       30 . The method according to  claim 28 , comprising generating said filter control signal based on said comparing. 
   
   
       31 . The method according to  claim 30 , comprising adjusting, within said single-chip multi-band RF receiver, one or both of a resistance value, and a capacitance value, for said filter circuit integrated within said single-chip multi-band RF receiver, based on said generated filter control signal. 
   
   
       32 . The method according to  claim 31 , comprising modifying a cut-off frequency for said filter circuit integrated within said single-chip multi-band RF receiver based on said adjusting one or both of said resistance value, and said capacitance value. 
   
   
       33 . The method according to  claim 30 , comprising adjusting one or both of a transconductance value, and a capacitance value, for said filter circuit integrated within said single-chip multi-band RF receiver based on said generated filter control signal. 
   
   
       34 . The method according to  claim 33 , comprising modifying a cut-off frequency for said filter circuit integrated within said single-chip multi-band RF receiver based on said adjusting one of both of said transconductance value, and said capacitance value. 
   
   
       35 . The method according to  claim 25 , wherein said filter circuit integrated within said single-chip multi-band RF receiver comprises a low-pass filter. 
   
   
       36 . The method according to  claim 35 , wherein said low-pass filter comprises a Chebyschev filter. 
   
   
       37 . A system for processing information in a wireless communication system, the system comprising:
 one or more circuits that enable generation of a test signal within a single-chip multi-band RF receiver;   said one or more circuits enable generation of a filter control signal within said single-chip multi-band RF receiver; and   said one or more circuits enable calibration of a frequency response for a filter circuit integrated within said single-chip multi-band RF receiver, by adjusting said filter circuit based on one or both of said test signal and said filter control signal.   
   
   
       38 . The system according to  claim 37 , wherein said one or more circuits enable generation, within said single-chip multi-band RF receiver, of an attenuated test signal by attenuating said test signal. 
   
   
       39 . The system according to  claim 37 , wherein said one or more circuits enable generation, within said single-chip multi-band RF receiver, of a filtered test signal based on filtering of said test signal by said filter circuit. 
   
   
       40 . The system according to  claim 39 , wherein said one or more circuits enable comparing, within said single-chip multi-band RF receiver, of an attenuated test signal and said filtered test signal. 
   
   
       41 . The system according to  claim 40 , wherein said one or more circuits enable computation, within said single-chip multi-band RF receiver, of an average for one or both of said attenuated test signal and said filtered test signal, prior to said comparing. 
   
   
       42 . The system according to  claim 40 , wherein said one or more circuits enable generation of said filter control signal based on said comparing. 
   
   
       43 . The system according to  claim 42 , wherein said one or more circuits enable adjustment, within said single-chip multi-band RF receiver, of one or both of a resistance value, and a capacitance value, for said filter circuit integrated within said single-chip multi-band RF receiver, based on said generated filter control signal. 
   
   
       44 . The system according to  claim 43 , wherein said one or more circuits enable modification of a cut-off frequency for said filter circuit integrated within said single-chip multi-band RF receiver based on said adjusting one or both of said resistance value, and said capacitance value. 
   
   
       45 . The system according to  claim 42 , wherein said one or more circuits enable adjustment of one or both of a transconductance value, and a capacitance value, for said filter circuit integrated within said single-chip multi-band RF receiver based on said generated filter control signal. 
   
   
       46 . The system according to  claim 45 , wherein said one or more circuits enable modification of a cut-off frequency for said filter circuit integrated within said single-chip multi-band RF receiver based on said adjusting one of both of said transconductance value, and said capacitance value. 
   
   
       47 . The system according to  claim 37 , wherein said filter circuit integrated within said single-chip multi-band RF receiver comprises a low-pass filter. 
   
   
       48 . The system according to  claim 47 , wherein said low-pass filter comprises a Chebyschev filter.