Local oscillator leak cancellation circuit

Details Local oscillator leak cancellation circuit Local oscillator leak cancellation circuit

1998-07-15

2000-12-26

Eisenzopf, Reinhard J.

Telecommunications

Receiver or analog modulated signal frequency converter

Frequency modifying or conversion

455296, 455295, H04B 110

Patent

active

061672475

ABSTRACT:
A method for reducing the level of an undesired signal, generated through a frequency converter device, by implementing a local oscillator (hereinafter "LO") leak cancellation circuit. A feedback correction loop, for a radio frequency (RF) transmitter or receiver, reduces an undesired local oscillator leak generated through a single input frequency converter device, such as a mixer, by a unique detection circuit. A unique nulling circuit is also implemented for a multiple input frequency converter device, such as a quadrature modulator.

REFERENCES:
patent: 4410764 (1983-10-01), Werth et al.
patent: 5381108 (1995-01-01), Whitmarsh et al.
patent: 5469105 (1995-11-01), Sparks
patent: 5517684 (1996-05-01), Fujita et al.
patent: 5628059 (1997-05-01), Kurisu
patent: 5918167 (1999-06-01), Tiller et al.
patent: 5959499 (1999-09-01), Khan et al.

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