Precision analog switching circuit employing MOS transistors

Details Precision analog switching circuit employing MOS transistors Precision analog switching circuit employing MOS transistors

1983-06-07

1987-03-17

Miller, Stanley D.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307577, 307443, 307579, 307584, 307585, H03K 1716, H03K 17693, H03K 19096

Patent

active

046510370

ABSTRACT:
An insulated-gate type field-effect transistor (MOST) analog switching circuit which has improved capacitance compensation to provide high speed, low transient noise operation and which is readily implemented as an integrated circuit comprises a switching MOST coupled between an analog signal input terminal and an output terminal, and two series connected compensation MOSTs which are substantially the same size as the switching MOST. The compensation MOSTs are connected so as to function as compensation capacitors and the series circuit is connected between the output terminal of the switching circuit and a source of pulses of opposite phase to the switching pulses applied to the gate of the switching MOST. The compensation MOSTs can be interconnected in different ways to form the series circuit, but gate-to-gate interconnection is preferred where the junction capacitance between the source-drain and substrate is not negligible with respect to the gate capacitance. Capacitor operation of the compensation MOSTs can be achieved by short-circuiting the source and drain of each MOST together, or by connecting the source and drain, respectively, of each MOST to the source or drain of other MOST.

REFERENCES:
patent: 4198580 (1980-04-01), Culmer
patent: 4393318 (1983-07-01), Takahashi et al.
patent: 4467227 (1984-08-01), Lewyn et al.
patent: 4511814 (1985-04-01), Matsuo et al.

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