Electronic digital logic circuitry – Signal sensitivity or transmission integrity – Input noise margin enhancement
Patent
1997-03-20
1999-02-09
Le, Vu A.
Electronic digital logic circuitry
Signal sensitivity or transmission integrity
Input noise margin enhancement
326 27, 326 28, 365206, H03K 3295
Patent
active
058699783
ABSTRACT:
Disclosed is a circuit for removing noise components included in a signal which an oscillator generates by using an integrator and hysteresis characteristic. The signal is oscillated by an oscillator. A square-wave generating inverter receives a sine wave signal including noise components oscillated by a quartz crystal oscillator circuit and then generates a square-wave signal having improved RC and integrator characteristics, and provides the generated square-wave signal to a Schmitt trigger. The Schmitt trigger receives the square-wave signal including the noise components from the square-wave generating inverter and removes the noise components included in the received square-wave signal. The circuit can remove noise components included in a signal oscillated by an oscillator due to a surrounding influence such as a temperature. Therefore, state clocks which is used in a microprocessor and a microcontroller, may be generated.
REFERENCES:
patent: 3984703 (1976-10-01), Jorgensen
patent: 4369381 (1983-01-01), Okamoto et al.
patent: 5602496 (1997-02-01), Mahmood
Daewoo Electronics Co. Ltd.
Le Vu A.
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