Schmitt trigger circuit

Details Schmitt trigger circuit Schmitt trigger circuit

1982-11-17

1984-12-25

Zazworsky, John

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307359, H03K 3295

Patent

active

044906277

ABSTRACT:
A Schmitt trigger uses a switched high gain MOS transistor coupled to a control node for speed but a low gain transistor to establish a control voltage on the control node to minimize current flow. In one mode the high gain transistor is switched off to allow the control node to increase in voltage. The low gain transistor limits the voltage on the control node by drawing current therefrom. Such current drawing is delayed in time to avoid reducing the initial rate of increase in voltage on the control node. By limiting the voltage on the control node, the charge stored is reduced thereby reducing effective input capacitance. Additionally, speed is increased when the high gain transistor is turned on because the voltage on the control node does not have to be reduced as far.

REFERENCES:
patent: 3882331 (1975-05-01), Sasaki
patent: 4069431 (1978-01-01), Kucharewski
patent: 4376251 (1983-03-01), Kobayashi et al.
patent: 4379974 (1983-04-01), Plachno

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