Dual conversion receiver with reduced harmonic interference

Details Dual conversion receiver with reduced harmonic interference Dual conversion receiver with reduced harmonic interference

2011-02-22

2011-02-22

Urban, Edward (Department: 2618)

Telecommunications

Receiver or analog modulated signal frequency converter

Frequency modifying or conversion

C455S068000, C455S296000

Reexamination Certificate

active

07894790

ABSTRACT:
A dual conversion receiver selects and down-converts one channel from a plurality of channels in a received RF signal. The dual conversion receiver includes first and second mixer stages that are driven by first and second local oscillator signals. Channel selection is performed by tuning the first local oscillator signal so that a desired channel is up-converted to a first IF frequency, which defines the center of the passband of a first bandpass filter connected between the first and second mixer stages. The second mixer stage down-converts the output of the first bandpass filter to a second IF frequency, which is further filtered by a second bandpass filter. The first and second local oscillators can produce harmonics that mix in the second mixer stage, causing unwanted spurious signals that can fall in band with the second IF frequency. In order to avoid interference from these unwanted spurious signals, the frequency step size of the first local oscillator is tuned so that the spurious signals fall out-of-band of the second IF frequency.

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