US2003232613A1PendingUtilityA1

Quadrature signal generation in radio-frequency apparatus and associated methods

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Priority: Jan 12, 2001Filed: Jan 15, 2003Published: Dec 18, 2003
Est. expiryJan 12, 2021(expired)· nominal 20-yr term from priority
Inventors:Donald A. Kerth
H04B 15/02H04B 1/406H04B 15/04H04B 2215/064H04B 1/28H04B 1/0003
45
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Claims

Abstract

A radio-frequency (RF) apparatus, which may reside in a receiver or transceiver, includes receive-path circuitry. The receive-path circuitry includes a poly-phase filter and a harmonic filter. The poly-phase filter accepts an input signal and generates two output signals. One output signal of the poly-phase filter constitutes an in-phase (I) signal. The other output signal of the poly-phase filter constitutes a quadrature (Q) signal. The a harmonic filter couples to the poly-phase filter. The harmonic filter accepts as input signals the in-phase and quadrature output signals of the poly-phase filter.

Claims

exact text as granted — not AI-modified
I claim:  
     
         1 . A radio-frequency (RF) apparatus, comprising: 
 receive-path circuitry, comprising: 
 a poly-phase filter, the poly-phase filter configured to accept an input signal and provide a first in-phase signal and a first quadrature signal; and  
 a harmonic filter coupled to the poly-phase filter, the harmonic filter configured to accept the first in-phase signal and the first quadrature signal.  
   
     
     
         2 . The radio-frequency (RF) apparatus according to  claim 1 , wherein the harmonic filter is further configured to provide a second in-phase signal and a second quadrature signal.  
     
     
         3 . The radio-frequency (RF) apparatus according to  claim 2 , wherein the harmonic filter is further configured to filter a third harmonic frequency of the input signal of the poly-phase filter.  
     
     
         4 . The radio-frequency (RF) apparatus according to  claim 3 , wherein the harmonic filter comprises a passive filter.  
     
     
         5 . The radio-frequency (RF) apparatus according to  claim 3 , wherein the harmonic filter comprises a passive complex filter.  
     
     
         6 . The radio-frequency (RF) apparatus according to  claim 3 , wherein the harmonic filter comprises an active filter.  
     
     
         7 . The radio-frequency (RF) apparatus according to  claim 6 , wherein the harmonic filter further comprises a transconductance circuitry coupled to a capacitor.  
     
     
         8 . The radio-frequency (RF) apparatus according to  claim 7 , wherein the harmonic filter comprises complementary metal oxide semiconductor (CMOS) circuitry.  
     
     
         9 . The radio-frequency (RF) apparatus according to  claim 7 , wherein the capacitor comprises an input capacitance of a limiter coupled to the harmonic filter.  
     
     
         10 . The radio-frequency (RF) apparatus according to  claim 3 , further comprising a buffer coupled to the poly-phase filter, the buffer configured to accept a local oscillator signal, the buffer further configured to provide the input signal of the poly-phase filter.  
     
     
         11 . The radio-frequency (RF) apparatus according to  claim 10 , further comprising: 
 a first mixer coupled to the harmonic filter, the first mixer configured to mix a radio-frequency (RF) signal with the second in-phase signal; and    a second mixer coupled to the harmonic filter, the second mixer configured to mix the ratio-frequency (RF) signal with the second quadrature signal.    
     
     
         12 . The radio-frequency (RF) apparatus according to  claim 10 , further comprising: 
 a first limiter coupled to the harmonic filter, the first limiter configured to accept the second in-phase signal, the first limiter further configured to generate a third in-phase signal; and    a second limiter coupled to the harmonic filter, the second limiter configured to accept the second quadrature signal, the second limiter further configured to generate a third quadrature signal.    
     
     
         13 . The radio-frequency (RF) apparatus according to  claim 12 , further comprising: 
 a first mixer coupled to the first limiter, the first mixer configured to mix a radio-frequency (RF) signal with the third in-phase signal; and    a second mixer coupled to the second limiter, the second mixer configured to mix the ratio-frequency (RF) signal with the third quadrature signal.    
     
     
         14 . The radio-frequency (RF) apparatus according to  claim 3 , wherein the receive-path circuitry comprises low-intermediate-frequency (low-IF) circuitry.  
     
     
         15 . The radio-frequency (RF) apparatus according to  claim 3 , wherein the receive-path circuitry comprises direct-conversion circuitry.  
     
     
         16 . A radio-frequency (RF) apparatus, comprising: 
 receive-path circuitry, comprising: 
 a harmonic filter, the harmonic filter configured to accept an input signal and to provide an output signal; and  
 a poly-phase filter coupled to the harmonic filter, the poly-phase filter configured to accept the output signal of the harmonic filter.  
   
     
     
         17 . The radio-frequency (RF) apparatus according to  claim 16 , wherein the poly-phase filter is further configured to provide a second in-phase signal and a second quadrature signal.  
     
     
         18 . The radio-frequency (RF) apparatus according to  claim 17 , wherein the harmonic filter is further configured to filter a third harmonic frequency of the input signal.  
     
     
         19 . The radio-frequency (RF) apparatus according to  claim 18 , wherein the harmonic filter comprises a passive filter.  
     
     
         20 . The radio-frequency (RF) apparatus according to  claim 18 , wherein the harmonic filter comprises a passive complex filter.  
     
     
         21 . The radio-frequency (RF) apparatus according to  claim 18 , wherein the harmonic filter comprises an active filter.  
     
     
         22 . The radio-frequency (RF) apparatus according to  claim 21 , wherein the harmonic filter further comprises a transconductance circuitry coupled to a capacitor.  
     
     
         23 . The radio-frequency (RF) apparatus according to  claim 22 , wherein the harmonic filter comprises complementary metal oxide semiconductor (CMOS) circuitry.  
     
     
         24 . A method of generating quadrature signals in a radio-frequency (RF) apparatus, the method comprising: 
 filtering an input signal in a poly-phase filter;    generating a first in-phase signal and a first quadrature signal; and    filtering the first in-phase signal and the first quadrature signal in a harmonic filter.    
     
     
         25 . The method according to  claim 24 , further comprising generating a second in-phase signal and a second quadrature signal with the harmonic filter.  
     
     
         26 . The method according to  claim 25 , wherein filtering the first in-phase signal and the first quadrature signal in the harmonic filter further comprises filtering a third harmonic frequency of the output signal of the poly-phase filter.  
     
     
         27 . The method according to  claim 26 , wherein the harmonic filter in filtering the first in-phase signal and the first quadrature signal comprises a passive filter.  
     
     
         28 . The method according to  claim 26 , wherein the harmonic filter in filtering the first in-phase signal and the first quadrature signal comprises an active filter.  
     
     
         29 . The method according to  claim 26 , wherein the harmonic filter comprises an active filter.

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