Direct conversion receiving circuit and direct conversion receiv

Details Direct conversion receiving circuit and direct conversion receiv Direct conversion receiving circuit and direct conversion receiv

1996-07-02

2000-06-06

Nguyen, Lee

Telecommunications

Receiver or analog modulated signal frequency converter

Noise or interference elimination

455314, 455317, 455318, 455324, H04B 110

Patent

active

060730005

ABSTRACT:
The invention provides a superheterodyne receiver by which undesired radiations are minimized. The superheterodyne receiver includes a voltage-controlled oscillator for forming an oscillation signal of a frequency equal to n times a carrier frequency of an object FM signal, and a frequency divider for dividing the frequency of the oscillation signal to the carrier frequency. The superheterodyne receiver further includes a pair of first mixers for frequency converting the object received signal into a pair of first intermediate-frequency signals using signals from the frequency divider as a first local oscillation signal, and a pair of second mixers for converting the first intermediate-frequency signals into a second intermediate-frequency signal with the second local oscillation signals. The superheterodyne receiver further includes a demodulator for demodulating the second intermediate-frequency signal into an original signal.

REFERENCES:
patent: 3480865 (1969-11-01), Sanders
patent: 4451930 (1984-05-01), Chapman et al.
patent: 4944025 (1990-07-01), Gehring et al.
patent: 5530929 (1996-06-01), Lindquist et al.
patent: 5548839 (1996-08-01), Caldwell et al.

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