CMOS input circuit

Details CMOS input circuit CMOS input circuit

1987-10-05

1989-05-16

Miller, Stanley D.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307448, 307451, 307572, 307576, H03K 1716, H03K 19017, H03K 17687

Patent

active

048312827

ABSTRACT:
A digital value represented by first and second pluralities of signals is converted into an analog value represented by an analog signal. The converter and the associated circuitry described above are preferably disposed on an integrated circuit chip formed from MOS transistors. Circuitry provides output currents of optimal waveforms from the digital-to-analog converters for driving stages subsequent to such converters. The circuits of this invention are advantageous because they operate satisfactorily at frequencies in excess of eighty-five megahertz (85 mhz). The circuits facilitate the production of the signals at such high frequencies by employing the distributed capacitances in a first transistor to expedite the response of a second transistor to binary input signals introduced to the first transistor. A servo system is also provided for controlling the magnitude of a biasing voltage introduced to the second transistor and for maintaining substantially constant the currents flowing at all times through one or the other of the first and second transistors.

REFERENCES:
patent: 4430580 (1984-02-01), Lovelace
IBM Tech. Disc. Bul., Bansal, vol. 25, No. 7A, 12/82.
IBM Tech. Dis. Bul., Craig, vol. 17, No. 12, 5/75.

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