Patent Number: 6,167,247

Title: Local oscillator leak cancellation circuit

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.

Inventors: Kannell; George Kenneth (Florham Park, NJ), Myer; Robert Evan (Denville, NJ), Sreenath; Krishnamurthy (Randolph, NJ)

Assignee: Lucent Technologies, Inc.

International Classification: H03C 1/06 (20060101); H03C 1/00 (20060101); H03D 7/00 (20060101); H04B 001/10 ()

Expiration Date: 12/26/2017