Local oscillator leak cancellation circuit
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United States of America Patent
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Dec 26, 2000
Grant Date -
N/A
app pub date -
Jul 15, 1998
filing date -
Jul 15, 1998
priority date (Note) -
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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.
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