DC level wandering cancellation circuit

Details DC level wandering cancellation circuit DC level wandering cancellation circuit

2007-03-27

2007-03-27

Nguyen, Long (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Amplitude control

C327S077000, C327S087000

Reexamination Certificate

active

11308883

ABSTRACT:
A DC level wandering cancellation circuit is provided. The DC level wandering cancellation circuit comprises a low pass filter, for receiving an input voltage; a high pass filter coupled to the low pass filter; an amplifier coupled to the high pass filter for receiving a reference voltage and an output signal of the high pass filter; a comparator coupled to the amplifier for receiving an output signal of the amplifier to compare the reference voltage with the output signal of the amplifier; a resistor coupled between outputs of the high pass filter and the amplifier; a control logic coupled to the comparator for receiving a compared result from the comparator; and a switching means coupled between the high pass filter and the output of the amplifier. The switching means is turned on for a predetermined interval by the control logic according to the compared result.

REFERENCES:
patent: 4297642 (1981-10-01), Baldwin et al.
patent: 4377759 (1983-03-01), Ohhata et al.
patent: 6246282 (2001-06-01), Oono et al.
patent: 7102409 (2006-09-01), Wu

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