Duty ratio adjusting circuit

Details Duty ratio adjusting circuit Duty ratio adjusting circuit

2007-10-23

2007-10-23

Wells, Kenneth B. (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Rectangular or pulse waveform width control

C327S172000

Reexamination Certificate

active

11388093

ABSTRACT:
A duty ratio adjusting circuit has a differential buffer (11) to produce a pulse signal (Dout) according to an input sine wave signal (Ain) and a reference voltage. The pulse signal is inverted and filtered to be supplied to a first analog buffer (14) as a direct voltage. The first analog buffer outputs voltage equal to the direct voltage. A second analog buffer (15) has the same structure as the first analog buffer and outputs voltage equal to the reference voltage. A differential amplifying circuit (16) produces an output voltage (SDout) as the reference voltage according to the difference between voltages output from the first and the second analog buffers. Capacitor (17, 19) connected to lines connecting between the first and the second analog buffers and the differential amplifying circuit.

REFERENCES:
patent: 4596954 (1986-06-01), Haque
patent: 5907254 (1999-05-01), Chang
patent: 6998894 (2006-02-01), Lee et al.
patent: 5-29893 (1993-02-01), None
patent: 9-214307 (1997-08-01), None
patent: 2003-243973 (2003-08-01), None

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