Low noise Gilbert Multiplier Cells and quadrature modulators
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United States of America Patent
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Dec 8, 1998
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app pub date -
Sep 8, 1997
filing date -
Sep 8, 1997
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Abstract
A Gilbert Multiplier Cell includes an emitter-coupled transistor pair and a pair of cross-coupled emitter-coupled transistor pairs. A filter couples the emitter-coupled transistor pair to the pair of the cross-coupled emitter-coupled transistor pairs. The filter may include a pair of inductors or resistors, a respective one of which serially couples a respective one of the emitter-coupled transistor pair to a respective one of the pair of cross-coupled emitter-coupled transistor pairs, and a capacitor connected between the pair of inductors or resistors. A local oscillator is coupled to the pair of cross-coupled emitter-coupled transistor pairs and a data input is coupled to the emitter-coupled transistor pair. By low pass filtering the output of the emitter-coupled transistor pair that is applied to the pair of cross-coupled emitter-coupled transistor pairs, low noise floor Gilbert Multiplier Cells and quadraphase modulators may be provided.
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