Transformer-coupled mixer circuit

Details Transformer-coupled mixer circuit Transformer-coupled mixer circuit

1997-04-18

1998-10-13

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific input to output function

Combining of plural signals

327119, 327123, 455333, G06F 744

Patent

active

058218025

ABSTRACT:
A transformer-coupled mixer circuit including dc voltage supply; and four transistors, arranged as a first transistor pair and a second transistor pair. Each transistor pair has a first transistor and a second transistor and each transistor has a base, a collector and an emitter. The emitter of the first transistor in each transistor pair is connected to the collector of the second transistor in that transistor pair, and the emitter of the second transistor in each transistor pair is connected to a current sink. The circuit also comprises a transformer, having a set of primary windings and first and second sets of secondary windings, the first set of secondary windings being connected in series with the emitter of the first transistor in the first transistor pair and the second set of secondary windings being connected in series with the emitter of the first transistor in the second transistor pair. The windings are arranged such that outputs taken from the first and second sets of secondary windings are 180 degrees out of phase, and the primary windings of the transformer are arranged to receive an input signal. The bases of all of the transistors are arranged to receive local oscillator signals, the dc voltage applied to the second transistor in each transistor pair being less than the dc voltage applied to the first transistor in each transistor pair. Finally, the signals applied to the first transistor pair are the inverse of the signals applied to the second transistor pair, such that the local oscillator signals activate only one transistor pair at a time.

REFERENCES:
patent: 4311929 (1982-01-01), Konrad et al.
patent: 4403156 (1983-09-01), Sakamoto
patent: 4636663 (1987-01-01), Jongepier et al.
IEEE Journal of Solid State Circuits, vol. SC3, pp. 365 to 373, Dec. 1968.
"Analysis and Design of Analogue Integrated Circuits", Third Edition, by Gray & Meyers, Wiley 1993, Figure 10.9, p. 670.

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