Even order term mixer

Telecommunications – Receiver or analog modulated signal frequency converter – Frequency modifying or conversion

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455333, 455318, H04B 126

Patent

active

054654157

ABSTRACT:
An even order term mixer for mixing two ac input signals includes two bipolar junction transistors (each having a base-emitter junction forward bias threshold voltage V.sub.T) with mutually connected collectors and cross-coupled bases and emitters. Each transistor receives a dc emitter bias current I.sub.E and both transistors each receive two single-ended ac input signals V.sub.1 (=.vertline.V.sub.1 .vertline..cos[2.pi.f.sub.1 t]) and V.sub.2 (=.vertline.V.sub.2 .vertline..cos[2.pi.f.sub.2 t]). Each transistor mixes its two ac input signals V.sub.1, V.sub.2 and produces a collector current representing the result thereof. The two collector currents sum at the interconnected collectors and produce across a resistor R.sub.C also connected thereto an ac output voltage V.sub.0 having even order terms and virtually no odd order terms of the mixing products (e.g. sum of and difference between the frequencies) of the two ac input signals.

REFERENCES:
patent: 4658440 (1987-04-01), Pavio et al.
patent: 4704738 (1987-11-01), Graziadie et al.
patent: 4910801 (1990-03-01), Anzini et al.
patent: 5083050 (1992-01-01), Vasile
D. C. Surana & J. G. Gardiner, "Crosscoupled Transistor Mixer", Proceedings of the IEEE, vol. 117, No. 11, Nov. 1970, pp. 2105-2108.

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