Operational amplifier output stage and method

Details Operational amplifier output stage and method Operational amplifier output stage and method

2007-09-18

2007-09-18

Pascal, Robert (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including plural stages cascaded

Reexamination Certificate

active

11210036

ABSTRACT:
An operational amplifier includes an input stage for producing a voltage signal in response to an input signal. An output stage includes an output transistor having a source coupled to a supply voltage and a gate coupled to receive the voltage signal. An output cascode transistor has a source coupled to a drain of the output transistor and a drain coupled to an output conductor. A gate control amplifier includes an input stage including a first input transistor having a control electrode coupled to the source of the output cascode transistor and an active load transistor, the input transistor and the active load transistor being coupled to a gate of the output cascode transistor. The gate control amplifier also includes a feedback amplifier having an input coupled to the source of the output cascode transistor and an output coupled to a control electrode of the active load transistor.

REFERENCES:
patent: 6150883 (2000-11-01), Ivanov
patent: 6642789 (2003-11-01), Ivanov et al.
patent: 6657495 (2003-12-01), Ivanov et al.
patent: 6788143 (2004-09-01), Chen

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