Wide tuning range receiver

摘要

A wide tuning range receiver is provided that includes first and second mixers, and first and second local oscillators. The first mixer can mix an input signal with a signal from the first local oscillator and output a signal having a first intermediate frequency, the second mixer can mix the signal having the first intermediate frequency with a signal from the second local oscillator and output a signal having a second intermediate frequency, and, for each input signal frequency, a relationship between the first and second local oscillators can be fixed.

主权项

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.