Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Slope control of leading or trailing edge of rectangular or...
Patent
1997-07-03
1999-03-16
Tran, Toan
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Slope control of leading or trailing edge of rectangular or...
327134, 327561, 327 77, 327554, H03K 512
Patent
active
058835350
ABSTRACT:
An amplification circuit is composed of a differential operational amplifier internally containing a current source circuit and having an inverted input connected to an output thereof through a parallel circuit composed of a first switch and a first capacitor. The inverted input is connected to one end of a second capacitor having the other end connected to a signal input terminal through a second switch. A non-inverted input of the differential operational amplifier is connected to a first reference voltage, and the other end of second capacitor is connected through a third switch to a second reference voltage. There is provided a current source generation circuit having a pair of input terminals connected to the non-inverted input and the inverted input of the differential operational amplifier, respectively, and an output connected to supply the internal current source circuit with a voltage value corresponding to a voltage difference between the non-inverted input and the inverted input of the differential operational amplifier, Thus, a slew rate controllable amplification circuit can be realized in which when a large slew rate is required, the current value of the internal current source circuit of the differential operational amplifier can be temporarily increased.
REFERENCES:
patent: 4894620 (1990-01-01), Nagaraj
patent: 5124593 (1992-06-01), Michel
patent: 5508649 (1996-04-01), Shay
patent: 5642063 (1997-06-01), Lehikoinen
patent: 5708376 (1998-01-01), Ikeda
NEC Corporation
Tran Toan
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