Linear amplifiers

Details Linear amplifiers Linear amplifiers

1978-10-06

1980-09-16

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

328127, 330288, H03F 345

Patent

active

042232759

ABSTRACT:
A voltage current transactor including a pair of cross-coupled current generators fed with equal currents from a constant current source. The current generators comprise cascaded bipolar transistor current mirrors in which current magnification is achieved by use of emitter multiplication. The output current is controlled only by the input voltage. Both the input port and output port are isolated in terms of identification (return paths) and while the input port can act on the output port, the reverse is not true. The device functions as a mid-identified current source wherein the current outputs are in anti-phase but independent of each other. The overall transconductance of the circuit can be programmed over a wide range by means of a single external resistor.
Typical applications of the transactor to provide linear amplification, differentiation, integration with integration constant and gyrator functions are described.

REFERENCES:
patent: 4004247 (1977-01-01), Van De Plassche
Van De Plassche, "A Wide-Band Operational Amplifier with a New Output Stage and a Simple Frequency Compensation, IEEE Journal of Solid-State Circuits, vol. SC-6, No. 6, Dec. 1971, pp. 347-352.

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