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US 4,539,489 AGranted
CMOS Schmitt trigger circuit
AssigneeMotorola, Inc.
InventorHerchel A. Vaughn
Life of this patent
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Abstract
A CMOS Schmitt trigger which has two series-connected inverters uses both an input and an output signal to provide hysteresis. A pair of series-coupled transistors is coupled between a power supply terminal and a node between the two inverters. One of the transistors has a control electrode for receiving the input signal. The other of the transistors has a control electrode for receiving the output signal.
Claims3
A Schmitt trigger comprising:
- a first inverter having an input for receiving an input signal, and an output coupled to a control node;
- a second inverter having an input coupled to the control node, and an output for providing an output signal;
- and
- a pair of series coupled transistors of a first conductivity type coupled between a first power supply terminal and the control node, with one of the pair having a control electrode for receiving the input signal and the other of the pair having a control electrode for receiving the output signal.
1 more element
Dependencies are inferred from the claim text.