Low power, low noise figure, latch driver circuit

Details Low power, low noise figure, latch driver circuit Low power, low noise figure, latch driver circuit

2007-11-20

2007-11-20

Le, Thanh Cong (Department: 2618)

Telecommunications

Receiver or analog modulated signal frequency converter

Frequency modifying or conversion

C455S326000, C455S333000

Reexamination Certificate

active

11041183

ABSTRACT:
A latch driver circuit is provided as a local oscillator driver for driving a passive mixer of an RF receiver. The driver circuit includes a differential amplifier stage coupled to a supply and a biasing circuit. The amplifier stage is operative to receive and process first and second input signals from a local oscillator for providing first and second amplified signals. The driver circuit further includes a latch stage coupled to the differential amplifier stage, which is operative to receive and process the first and second amplified signals for providing latched versions thereof. A filtering stage of the latch driver circuit is operative to receive and filter the latched versions of the first and second amplified signals for providing first and second mixer signals. Each of the first and second mixer signals includes signal content associated with a fundamental frequency particularly tuned for driving the passive mixer circuit.

REFERENCES:
patent: 4237387 (1980-12-01), Devendorf et al.
patent: 4468784 (1984-08-01), Jagnow et al.
patent: 5438693 (1995-08-01), Cox
patent: 6785530 (2004-08-01), Hatcher et al.
Alireza Zolfaghari and Behzad Razavi; A Low-Power 2.4-GHz Transmitter/Receiver CMOS IC; IEEE Journal of Solid-State Circuits, vol. 38, No. 2 Feb. 2003.

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