Amplifiers – With semiconductor amplifying device – Including push-pull amplifier
Patent
1995-12-20
1997-03-25
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including push-pull amplifier
330263, 330265, H03F 330
Patent
active
056148666
ABSTRACT:
An amplifier includes an output buffer having an input coupled to a gain node which is the common node of the outputs of first and second current mirrors for receiving a signal current and having an output for providing an amplified drive current. The output buffer includes a first transistor of a first type having its base coupled to a gain node of the output buffer and to the base of a first transistor of a second type for receiving the signal current. The emitter of the first transistor of a first type is coupled to the base of a second transistor of a second type. The emitter of the first transistor of the second type is coupled to the base of a second transistor of the first type. The emitter of the second transistor of the first type is coupled to the emitter of the second transistor of the second type and to the output of the buffer. In response to a programming current and an input signal current, first and second current mirrors of complementary transistor types provide an output signal current to the output buffer and provide biasing currents to the buffer. Third and fourth current sources, which are complementary, each have an terminal coupled to the second input of the respective first and second current sources for providing a biasing current. A fifth current source has a first terminal coupled to the output of the buffer and has a second terminal coupled to the second input of the first current source for providing a compensation current to substantially increase the output impedance of the first current source. A sixth current source has a first terminal coupled to the output of the buffer and has a second terminal coupled to the second input of the second current source for providing a compensation current to substantially increase the output impedance of the second current source.
REFERENCES:
patent: 5179355 (1993-01-01), Harvey
patent: 5351012 (1994-09-01), Toumazou
patent: 5515005 (1996-05-01), Yoshioka
Schematic--Elantec Model EL 2028 Operational Amplifier.
Schematic--Elantec Model EL 2029 Operational Amplifier.
Elantec, Inc.
Mullins James B.
Smith Albert C.
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