Motorola Corporation

Philippe Gorisse

Mark J Chambers

Jesus L Finol

Jesus S Pena-Finol

Erica G Miller

Michael J McGowan

A multiplier (10) includes a transconductor (14) and a multiplier core (34). The transconductor (14) converts an RF voltage signal to an RF current signal. The RF current signal modulates the quiescent currents flowing in current conducting elements (23, 24), thereby generating a modulated current signal. The modulated current signal is transmitted to the multiplier core (34), where it is combined with an LO signal to generate an output signal. The transconductor (14) and the multiplier core (34) have their current conduction paths separated from each other by the current conducting elements (23, 24).

Multiplier and method for mixing signals

A transmitter (300) sends a transmitted current (I.sub.203, I.sub.204) along a transmit signal path (203, 204) to a receiver (400) having a low input impedance. The receiver includes a transistor structure (402, 404) that amplifies the transmitted current and feeds it back to the input of the receiver to maintain the low input impedance and a substantially constant voltage on the transmit signal path. The substantially constant voltage at the input of the receiver avoids interference with other circuits (206, 208) located along the transmit signal path.

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Mesa, AZ, United States of America

Philippe Gorisse