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Abstract

A four terminal multiplication circuit capable of mixing up to three input signals. The circuit includes a MOS transistor having gate, source, drain and back-gate terminals. When the circuit is used as an RF mixer or downconverter, an RF signal is provided to the gate terminal and a local oscillator signal is provided to the back-gate terminal. A DC voltage is applied to the source terminal for biasing the transistor and the mixed/downconverted output (IF) signal is obtained from the drain terminal. A single balanced and a double balanced mixer circuit are also disclosed. In the single balanced circuit, two MOS transistors are used; the RF signal is applied to the gate terminals with the positive phase LO component applied to one back-gate terminal and the negative phase local oscillator (LO) component applied to the other back-gate terminal for producing a positive phase and a negative phase IF signal. In the double balanced circuit, four MOS transistors are used; the positive phase RF signal is applied to the gate terminals of two of the transistors and the negative phase RF signal is applied to the gate terminals of the other two transistors. Likewise, the positive phase LO signal is applied to two of the transistors and the negative phase LO signal is applied to the other two transistors.

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First Claim