Wake-up circuit

Details Wake-up circuit Wake-up circuit

2006-02-03

2008-03-11

Lam, Tuan T (Department: 2816)

Electrical pulse counters, pulse dividers, or shift registers: c

Systems

Counter controlled counter

Reexamination Certificate

active

07342990

ABSTRACT:
A wake-up circuit includes a counter, a register circuit, a first logic circuit, an oscillator, a flip flop, and a second logic circuit. The wake-up circuit receives a standby signal to stop the oscillator working and to wait for the wake-up signal to reactivate the oscillator again. When the duration of the wake-up signal is shorter than an expected time of the counter, the oscillator stops working again and re-enters the saving mode. When the duration of the wake-up signal is longer than the expected time of the counter, the counter controls the flip flop to output a preset signal to the register circuit, and as a result that keeps the oscillator working even after the wake-up signal is removed by the first logic circuit operating, and then the second logic circuit operates with flip-flop to set the counter returning to a normal state to wait for a next standby signal to feed in.

REFERENCES:
patent: 5702426 (1997-12-01), Pons et al.
patent: 5973617 (1999-10-01), Reichmeyer et al.
patent: 6782485 (2004-08-01), Takai

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