Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Amplitude control
Patent
1996-04-05
1998-08-25
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Amplitude control
330259, H03L 500, H03F 345
Patent
active
057986649
ABSTRACT:
In an optical receiver, an offset cancelling amplifier comprises a limiting amplifier for amplifying an input signal while preventing amplified amplitude from exceeding a predetermined level to provide an output signal, an offset detector for detecting an offset in the output signal to produce a detection signal representative of the offset amount detected, and an offset controller coupled in the input circuit of the limiting amplifier and the offset detector for controlling an input voltage of the limiting amplifier in response to the detection signal to reduce the offset in the output signal. In order to widen the dynamic range and lower the low-frequency cutoff of the offset cancelling amplifier, the offset detector comprises a Miller integrator.
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Araki Soichiro
Hatakeyama Ichiro
Miyoshi Kazunori
Nagahori Takeshi
Callahan Timothy P.
NEC Corporation
Nu Ton My-Trang
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