Methods and apparatus for implementing a receiver on a monolithic integrated circuit

Abstract

A monolithic integrated circuit includes a tuner and a SAW filter function. The tuner receives a radio frequency (RF) television signal that has a range of fundamental frequencies from 55 mega hertz (Mhz) to 880 Mhz. The tuner down converts the RF television signal to an intermediate frequency (IF) television signal that has a low fundamental frequency. In one embodiment, the SAWF filter performs the SAW filter function on the IF television signal. In another embodiment, the SAWF filter performs the SAW filter function at baseband. An IF processor for processing the IF television signal to generate a video television signal and an audio television signal is disclosed.

1 . A monolithic integrated circuit comprising: 
 tuner for receiving a radio frequency (RF) television signal, said RF television signal comprising a plurality of television channels, wherein a television channel comprises a picture carrier (F p ), a sound carrier (F s ) and a color sub-carrier (F sc ) signals, said tuner for down converting said RF television signal to an intermediate frequency (IF) television signal, said IF television signal comprising a fundamental frequency below 20 Mhz; and    IF demodulator circuit comprising a Nyquist filter, coupled to said tuner, for receiving said IF television signal and for filtering, at a frequency below 20 Mhz, said IF television signal to reject signals in adjacent channels, to generate a Nyquist slope, and to extract a picture signal content from said picture carrier (F p ) and color sub-carrier (F sc ) signals and a sound signal content from said sound carrier (F s ) signal.    
   
   
       2 . The monolithic integrated circuit as set forth in  claim 1 , further comprising an IF processor, coupled to said Nyquist filter, for processing said picture carrier and said color sub-carrier signals to generate a video television signal and said sound carrier to generate an audio television signal.  
   
   
       3 . The monolithic integrated circuit as set forth in  claim 1 , wherein said fundamental frequency of said IF television signal comprises 13 Mhz.  
   
   
       4 . The monolithic integrated circuit as set forth in  claim 1 , wherein said Nyquist filter comprises at least one notch filter.  
   
   
       5 . The monolithic integrated circuit as set forth in  claim 1 , wherein said Nyquist filter comprises at least one bandpass filter.  
   
   
       6 . The monolithic integrated circuit as set forth in  claim 1 , wherein said Nyquist filter comprises a plurality of biquad filters.  
   
   
       7 . A monolithic integrated circuit comprising: 
 tuner for receiving a radio frequency (RF) television signal, said RF television signal comprising a plurality of television channels, wherein a television channel comprises a picture carrier (F p ), a sound carrier (F s ) and a color sub-carrier (F sc ) signals, said tuner for down converting said RF television signal to an intermediate frequency (IF) television signal;    IF demodulator circuit, coupled to said tuner, for down converting said IF television signal to a baseband television signal; and    Nyquist filter, coupled to said tuner, for receiving said baseband television signal and for filtering said baseband television signal to reject signals in adjacent channels, to generate a Nyquist slope, and to extract a picture signal content from said picture carrier (F p ) and color sub-carrier (F sc ) signals and a sound signal content from said sound carrier (F s ) signal.    
   
   
       8 . The monolithic integrated circuit as set forth in  claim 7 , further comprising an IF processor, coupled to said Nyquist filter, for processing said picture carrier and said color sub-carrier signals to generate a video television signal and said sound carrier to generate an audio television signal.  
   
   
       9 . The monolithic integrated circuit as set forth in  claim 7 , wherein said fundamental frequency of said IF television signal comprises 13 Mhz.  
   
   
       10 . The monolithic integrated circuit as set forth in  claim 7 , wherein said Nyquist filter comprises at least one notch filter.  
   
   
       11 . The monolithic integrated circuit as set forth in  claim 7 , wherein said Nyquist filter comprises at least one bandpass filter.  
   
   
       12 . The monolithic integrated circuit as set forth in  claim 7 , wherein said Nyquist filter comprises a plurality of biquad filters.  
   
   
       13 . A method for processing an RF television signal, said method comprising: 
 receiving a radio frequency (RF) television signal, said RF television signal comprising a plurality of television channels, wherein a television channel comprises a picture carrier (F p ), a sound carrier (F s ) and a color sub-carrier (F sc ) signals;    down converting said RF television signal to an intermediate frequency (IF) television signal, said IF television signal comprising a fundamental frequency below 20 Mhz; and    filtering, at a frequency below 20 Mhz, said IF television signal to reject signals in adjacent channels, to generate a Nyquist slope, and to extract a picture signal content from said picture carrier (F p ) and color sub-carrier (F sc ) signals and a sound signal content from said sound carrier (F s ) signal.    
   
   
       14 . The method as set forth in  claim 13 , further comprising processing said picture carrier and said color sub-carrier signals to generate a video television signal and said sound carrier to generate an audio television signal.  
   
   
       15 . The method as set forth in  claim 13 , wherein said fundamental frequency of said IF television signal comprises 13 Mhz.  
   
   
       16 . The method as set forth in  claim 13 , wherein said Nyquist filter comprises at least one notch filter.  
   
   
       17 . The method as set forth in  claim 13 , wherein said Nyquist filter comprises at least one bandpass filter.  
   
   
       18 . The method as set forth in  claim 13 , wherein said Nyquist filter comprises a plurality of biquad filters.