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: 
 a tuner for receiving a radio frequency (RF) television signal and down converting the RF television signal to an intermediate frequency (IF) television signal, the tuner comprising:    at least two tunable filters, each tunable filter comprising a first component comprising a capacitive, inductive, or resistive component and a second component comprising a capacitive, inductive, or resistive component, wherein the first components of the least two tunable filters are substantially equal in value, the second components of the least two tunable filters are not substantially equal in value, and the frequency response of each tunable filter is linearly proportional to the value of the second component of the tunable filter; and    and IF processor, coupled to the tuner, for down converting the IF television signal to a baseband television signal.    
   
   
       2 . The monolithic integrated circuit of  claim 1 , wherein the frequency response ratio of the first tunable filter and the second tunable filter is equal to a ratio of the second component value of the first tunable filter and the second component value of the second tunable filter.  
   
   
       3 . The monolithic integrated circuit of  claim 1 , wherein the frequency response of a first tunable filter relative to a frequency response of a second tunable filter is dependent on the second component values of the first and second tunable filters.  
   
   
       4 . The monolithic integrated circuit of  claim 1 , wherein: 
 the first component of each tunable filter comprises a capacitive component substantially equal in capacitive value; and    the second component of each tunable filter comprises a resistive component not substantially equal in resistive value.    
   
   
       5 . The monolithic integrated circuit of  claim 4 , wherein: 
 the frequency response of a tunable filter is lineraly proportional to the resistive value of the second component.    
   
   
       6 . The monolithic integrated circuit of  claim 4 , wherein the frequency response ratio of a first tunable filter and a second tunable filter is equal to a ratio of the resistive value of the first tunable filter and the resistive value of the second tunable filter.  
   
   
       7 . The monolithic integrated circuit of  claim 1 , wherein the second component of each tunable filter comprises a plurality of selectable capacitive, inductive, or resistive elements configured for a particular frequency response.  
   
   
       8 . The monolithic integrated circuit of  claim 7 , wherein the capacitive, inductive, or resistive elements are configured in parallel and individually selectable or deselectable to change the frequency response of the tunable filter.  
   
   
       9 . The monolithic integrated circuit of  claim 7 , wherein a capacitive, inductive, or resistive element is selected or deselected to add or remove capacitive, inductive, or resistive value to the second component of a tunable filter.  
   
   
       10 . The monolithic integrated circuit of  claim 7 , wherein a capacitive, inductive, or resistive element is selectable using a binary code.  
   
   
       11 . The monolithic integrated circuit of  claim 7 , wherein the frequency response of the first tunable filter relative to a frequency response of the second tunable filter is dependent on the selection of capacitive, inductive, or resistive elements in the second component of each tunable filter.  
   
   
       12 . The monolithic integrated circuit of  claim 7 , wherein the first component of a tunable filter comprises a single capacitive, inductive, or resistive element.  
   
   
       13 . The monolithic integrated circuit of  claim 7 , wherein the first component of each tunable filter comprises a plurality of selectable capacitive, inductive, or resistive elements configured for a particular frequency response.  
   
   
       14 . The monolithic integrated circuit of  claim 1 , wherein a tunable filter comprises a bandpass or notch filter.  
   
   
       15 . The monolithic integrated circuit of  claim 1 , wherein the monolithic integrated circuit comprises a closed circular alternating (AC) loop.  
   
   
       16 . The monolithic integrated circuit of  claim 1 , wherein the RF television signal comprises a range of fundamental frequencies from 55 mega hertz (Mhz) to 210 Mhz.