Using hysteresis to generate a low power clock

Details Using hysteresis to generate a low power clock Using hysteresis to generate a low power clock

2007-06-05

2007-06-05

Chang, Joseph (Department: 2817)

Oscillators

With particular source of power or bias voltage

Regulated

C331S160000, C331S183000

Reexamination Certificate

active

11049420

ABSTRACT:
A real time clock that operates an oscillator within a predetermined range by employing a constant current source. The remaining real time clock logic can be operated at a voltage that is relative to the constant current. Power consumption of the oscillator can be controlled by limiting the current from the constant current source. The outputs of the oscillator can be input into a signal detector. A clocking signal can be produced by the signal detector based on the oscillator signals. The current provided by the first current source is limited to provide low power operation of the oscillator. Optionally, the signal detector can employ a differential amplifier. The differential amplifier receives the oscillator outputs, and provides a clocking signal based on the oscillator outputs.

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patent: 5546055 (1996-08-01), Klughart
patent: 6091307 (2000-07-01), Nelson
patent: 6611918 (2003-08-01), Uzelac
patent: 2003/0132741 (2003-07-01), Senthilkumar et al.

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