Low power clock squarer with tight duty cycle control

Details Low power clock squarer with tight duty cycle control Low power clock squarer with tight duty cycle control

1997-12-18

2000-07-18

Lam, Tuan T.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Rectangular or pulse waveform width control

327184, 327291, 327299, H03K 3017

Patent

active

060912723

ABSTRACT:
The present invention is directed to a method and apparatus for producing a square wave output signal with a clock circuit that possesses characteristics of low current consumption, relatively tight duty cycle control, and versatility over a wide range of voltages and input signal frequencies down to, and including DC. Exemplary embodiments receive an input signal, and process the input signal into an output square wave signal. A processing of the input signal is achieved using at least one current mirror for controlling a duty cycle of the output square wave signal said at least one current mirror being implemented in part with at least one pair of cascoded transistors. The processing is further achieved with an output stage having at least one inverter operatively connected with a node between the transistors of the at least one pair of cascoded transistors to control switching of the at least one pair of cascoded transistors.

REFERENCES:
patent: 4072870 (1978-02-01), Davis
patent: 4110641 (1978-08-01), Payne
patent: 4689819 (1987-08-01), Killion
patent: 4728815 (1988-03-01), Main
patent: 5414354 (1995-05-01), Bushman

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