DC offset cancellation circuit, differential amplification...

Details DC offset cancellation circuit, differential amplification... DC offset cancellation circuit, differential amplification...

2007-10-09

2007-10-09

Wells, Kenneth B. (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Amplitude control

C327S363000, C327S563000

Reexamination Certificate

active

10372967

ABSTRACT:
A DC offset cancellation circuit that is capable of canceling a DC offset voltage occurring between a pair of differential output signals of a differential amplification circuit, while preventing a signal waveform from being distorted due to accumulation of AC components and a photo-electric pulse conversion circuit that is capable of generating an electrical pulse signal that accurately reproduces a rise timing and a fall timing of an optical pulse signal by canceling the DC offset voltage are provided. A photo-electric pulse conversion circuit is provided with a photodiode, an I-V conversion circuit, a first differential amplification circuit having a DC offset cancellation circuit, a second differential amplification circuit, a reference voltage generation circuit, and a comparison circuit. The DC offset cancellation circuit uses a changeover circuit to change a state of a low-pass filter with a hold function in synchronization with an inversion electrical pulse signal, and performs a negative feedback of a filtered signal which is generated by subjecting third differential signals to low-pass filtration or a hold filtered signal which is a filtered signal held during changeover.

REFERENCES:
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patent: 5648738 (1997-07-01), Welland et al.
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patent: 6288604 (2001-09-01), Shih et al.
patent: 6933762 (2005-08-01), Ono
patent: 7098716 (2006-08-01), Ono

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