Tuned low power/low noise mixer

Details Tuned low power/low noise mixer Tuned low power/low noise mixer

1999-07-08

2000-12-05

Vo, Nguyen

Telecommunications

Receiver or analog modulated signal frequency converter

Frequency modifying or conversion

455326, 455333, 455292, H04B 116

Patent

active

061578223

ABSTRACT:
A tuned low noise mixer (200) for use in radio frequency (RF) communications includes a transconductance amplifier (203) for amplifying an RF input signal (201). An impedance matching network (207) is formed using an impedance matching transformer with a tap connection (207') between primary and secondary coils. A mixer circuit (209) is then used for mixing a local oscillator signal (211) with the output of the impedance matching network (207) while a load network (213) provides a load to an output (215) of the mixer circuit (209). The invention provides a novel RF mixer topology that has a substantially low noise figure and a proportionally large power gain with low current drain for eliminating the need for an low noise amplifier (LNA) commonly used in RF mixer circuitry.

REFERENCES:
patent: 3727078 (1973-04-01), Wollesen
patent: 4636663 (1987-01-01), Jongepier et al.
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patent: 5884154 (1999-03-01), Sano et al.
patent: 6026286 (2000-02-01), Long
patent: 6094571 (2000-07-01), Groe
Abou-Allam, E., El-Masry, E.I., and Manku, T., "CMOS Front End RF Amplifier with On-Chip Tuning," IEEE 1996.

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