Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – Nonlinear amplifying circuit
Patent
1994-07-22
1995-08-01
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
Nonlinear amplifying circuit
327563, 327575, 327577, 327356, 327357, 327359, 327361, G06G 712, G06F 744
Patent
active
054382963
ABSTRACT:
A multiplier circuit includes first and second squaring circuits each having a differential input terminal pair. A first input terminal of the differential input terminal pair of the first squaring circuit is applied with a first input voltage and the second input terminal thereof is applied with a second input voltage opposite in phase to the first input voltage. A first input terminal of the differential input terminal pair of the second squaring circuit is supplied with the second input voltage and the second input terminal thereof is applied with the first input voltage. The first and second squaring circuits each includes two sets of unbalanced differential transistor pairs which are arranged so that their inputs are opposite in phase and their outputs are connected in common. The transistors of each unbalanced differential transistor pair have different emitter sizes. Two transistors, having different emitter sizes and constituting a differential transistor pair may be connected with an emitter resistor having a resistance value inversely proportional to the emitter size ratio of the transistors forming the differential transistor pair. The two transistors constituting each differential transistor pair may be equal in emitter size. In this case, only one transistor thereof has an emitter resistor connected to it.
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Messtechnik, vol. 80, No. 9, Sep. 1972, pp. 257-262, Zabler, "Neue Transistorquadrierstufe mit Glatter Parabelkennlinie zur Realisierung eines einfachen Parabelmultiplizierers hoher Genauigkeit".
IEEE Journal of Solid-State Circuits, vol. SC22, No. 6, Dec. 1987, pp. 1064-1073, Pena-Finol et al., "A MOS four-quadrant analog multiplier using the quarter-square techniqe".
Callahan Timothy P.
NEC Corporation
Phan Trong
LandOfFree
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