Programmable delay circuit

Details Programmable delay circuit Programmable delay circuit

2006-12-01

2009-11-17

Donovan, Lincoln (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Having specific delay in producing output waveform

C327S278000, C327S264000

Reexamination Certificate

active

07619457

ABSTRACT:
A delay circuit is described having a variable capacitor and a triggering circuit. The variable capacitor and the triggering circuit may both comprise transistors. With both the variable capacitor and the triggering circuit dependent on the threshold voltage, the delay circuit may be less sensitive to process variations. The delay circuit may also include a capacitor, a first triggering circuit, a second triggering circuit, and a pull down circuit. The capacitor may discharge at a first rate, triggering the first triggering circuit which, in turn, activates the pull down circuit to pull down the capacitor at a second rate that is faster than the first rate. The second triggering circuit is triggered as the capacitor is pulled down, thereby reducing the effect of input signal noise on the output of the delay circuit. The discharging of the capacitor may be adjusted by a control input thereby making the delay of the delay circuit programmable.

REFERENCES:
patent: 5081380 (1992-01-01), Chen
patent: 6060930 (2000-05-01), Choi
patent: 6121811 (2000-09-01), Scott et al.
patent: 6348827 (2002-02-01), Fifield et al.
patent: 6407601 (2002-06-01), Lin
patent: 6525586 (2003-02-01), Ahmed et al.
patent: 6987407 (2006-01-01), Chung et al.

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