Superheterodyne receiver having at least one downconversion...

Details Superheterodyne receiver having at least one downconversion... Superheterodyne receiver having at least one downconversion...

2011-01-25

2011-01-25

Nguyen, Duc (Department: 2618)

Telecommunications

Receiver or analog modulated signal frequency converter

With wave collector

C455S189100, C370S478000

Reexamination Certificate

active

07877073

ABSTRACT:
A multi-channel superheterodyne receiver employs a low intermediate frequency (IF) and both high-side injection and low-side injection of a selected local oscillator (LO) signal into the mixer in order to position image frequencies outside the passband of a single image reject filter. Any channel that falls within a used portion of the image reject filter passband can be downconverted with image rejection if the utilized bandwidth portion is no greater than about 4 times the IF minus the bandwidth of a channel in the filter passband. Low side injection is used for channels falling within the lower half of the passband of the image reject filter, while high-side injection is used for channels falling within the upper half thereof. The image always remains outside the passband and the receiver can accommodate a greatly increased number of channels.

REFERENCES:
patent: 6487219 (2002-11-01), Snider

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