Operational amplifier

Details Operational amplifier Operational amplifier

1987-03-18

1988-06-07

Wan, Gene

Amplifiers

With semiconductor amplifying device

Including push-pull amplifier

330262, H03F 326

Patent

active

047499583

ABSTRACT:
The invention relates to an operational amplifier, particularly for signal amplification requiring high accuracy and extremely high speed which includes bandwidth, slew rate and settling time. A current feedback can be implemented with a low impedance inverting input for an increased high frequency performance. The operational amplifier according to the present invention has an input stage providing a pair of output signals, thus preserving a differential nature of the input signal of the operational amplifier. A power amplifier means is coupled to the input stage for amplifying and converting the output signals thereof into a single output signal. A very high open loop gain and save phase margin are obtained with a low number of amplification stages as the input stage has inherently a high voltage gain and the output signals thereof are amplified separately, whereby the common base configuration is preferred.

REFERENCES:
patent: 4549145 (1985-10-01), van de Plassche

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