Receiver system

Details Receiver system Receiver system

2007-04-10

2007-04-10

Vuong, Quochien B. (Department: 2618)

Telecommunications

Receiver or analog modulated signal frequency converter

Noise or interference elimination

C455S334000, C333S167000

Reexamination Certificate

active

10277870

ABSTRACT:
A conventional receiver system has a filter circuit with unsatisfactory gain characteristics, and thus does not offer satisfactory reception performance. A receiver system of the invention has a filter circuit employing an equivalent inductor circuit including a capacitor, a gyrator composed of a plurality of operational transconductance amplifiers and having the capacitor as a load, and a resistor connected in series with the capacitor. A conventional receiver system has a band-pass filter circuit with a low third-order input intercept point, and thus does not offer satisfactory reception performance. The receiver system of the invention has, in the stage following a mixer, a band-pass filter circuit composed of a low-pass filter and a band-pass filter receiving the output signal of the low-pass filter, wherein the value obtained by dividing the higher cutoff frequency of the band-pass filter by the lower cutoff frequency thereof is smaller than 2, the center frequency of the band-pass filter is within a range of from about 1 to 3 MHz, and the cutoff frequency of the low-pass filter is higher than the center frequency of the band-pass filter.

REFERENCES:
patent: 3824496 (1974-07-01), Hekimian
patent: 5539241 (1996-07-01), Abidi et al.
patent: 6175727 (2001-01-01), Mostov
patent: 6809616 (2004-10-01), Liu et al.
patent: 62-287720 (1987-12-01), None
patent: 2-13304 (1990-01-01), None
patent: 05-090992 (1993-04-01), None
patent: 11-186873 (1999-07-01), None

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