Patent ID: 9595987
Date: 2017-03-14
CPC Classifications: H03D,H04B

Claim:
1. An apparatus comprising: at least one band pass filter; first and second mixers; and first and second local oscillators, wherein the band pass filter processes an input signal and passes a filtered signal to the first mixer, wherein the first mixer mixes the filtered signal with a signal from the first local oscillator and outputs a signal having a first intermediate frequency, wherein the second mixer mixes the signal having the first intermediate frequency with a signal from the second local oscillator and outputs a signal having a second intermediate frequency, wherein, for each input signal frequency, a relationship between the first and second local oscillators is fixed, wherein the first local oscillator is tuned to a selected frequency based on a tuning lookup table that compensates for part and production characteristics and variations of the apparatus, and wherein a relationship between the input signal frequency and the selected frequency of the first local oscillator is non-fixed.