Low noise Gilbert Multiplier Cells and quadrature modulators

Details Low noise Gilbert Multiplier Cells and quadrature modulators Low noise Gilbert Multiplier Cells and quadrature modulators

1997-09-08

1998-12-08

Grimm, Siegfried H.

Modulators

Phase shift keying modulator or quadrature amplitude modulator

Including discrete semiconductor device

327119, 327359, 332159, 332178, 375261, 375298, 455333, H03C 136, H04B 128, H04L 2704, H04L 2736

Patent

active

058476237

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.

REFERENCES:
patent: 5379457 (1995-01-01), Nguyen
patent: 5574755 (1996-11-01), Persico
patent: 5625307 (1997-04-01), Scheinberg
Gray et al., "Analysis and Design of Analog Integrated Circuit, Third Edition", John Wiley & Sons, Inc., 1993,pp. 670-675.

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