Multiplier circuit for processing differential signals, e.g. for use in mobile phone systems, is suitable for use in vector modulators, has a simple design and improved noise properties

摘要

Multiplier circuit comprises: first (1, 2) and second (15, 16) inputs for delivery of first and second input signals; an output (9, 10) for delivery of an output signal dependent on the two inputs; first and second transistor pairs (3, 4; 5, 6) with control inputs that are coupled to the first input and have control paths that are linked to the outputs of the multiplier circuits and at their other ends from a power input; and a current mirror (11, 12) connected on the output side to the transistors pairs and input side to the multiplier circuit inputs.