Integrator and active filter including integrator with simple ph

Details Integrator and active filter including integrator with simple ph Integrator and active filter including integrator with simple ph

1989-07-26

1992-01-14

Westin, Edward P.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307520, 328167, 330252, G06G 718, H03K 500

Patent

active

050814230

ABSTRACT:
In an integrator circuit having a wide linearity range, there are provided: a first emitter-coupled transistor pair having two bipolar transistors, emitter areas of the transistors being substantially equal to each other; a second emitter-coupled transistor pair having two bipolar transistors, emitter areas of said transistors being substantially equal to each other; first and second input terminals for receiving an input voltage respectively; a first output terminal to which a first collector of the first emitter-coupled pair and also a first collector of the second emitter-coupled transistor pair of commonly connected; a second output terminal to which a second collector of the first emitter-coupled transistor pair and also a second collector of the second emitter-coupled transistor pair are commonly connected; first DC-voltage applying means connected to the first input terminal, for applying a first offset DC (direct current) voltage having a predetermined level between a first base electrode of the first emitter-coupled transistor pair and a first base electrode of the second emitter-coupled transistor pair; second DC-voltage applying means connected to the second input terminal, for applying a second offset DC voltage having the same level but an opposite polarity to that of the first offset DC voltage between a second base electrode of the first emitter-coupled transistor pair and a second base electrode of the second emitter-coupled transistor pair; and, capacitance means connected between the first and second output terminals.

REFERENCES:
patent: 3986127 (1976-10-01), Ray
patent: 4748420 (1988-05-01), Metz
patent: 4808942 (1989-02-01), Milkovic
patent: 4904952 (1990-02-01), Tanimoto
Khorramabadi et al., "High-Frequency CMOS Continuous-Time Filters", IEEE Journal of Solid-State Circuits, vol. Sc-19, No. 6, Dec. 1984, pp. 939-948.
Proceedings of the International Symposium on Circuits and Systems, Kyoto, 5th-7th Jun. 1985, vol. 3, pp. 1427-1430, IEEE, New York, US; S. Masuda et al.: "A Monolithic Continuous-Time Low-Pass Filter".

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