Amplifiers – With semiconductor amplifying device – Including field effect transistor
Patent
1989-12-07
1991-09-17
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including field effect transistor
330286, 330295, 330300, H03F 3195
Patent
active
050498363
ABSTRACT:
A circuit, comprising an amplifier and a transformer is disclosed that produces a high power pulse having a fast response time, and that responds to a digital control signal applied through a digital-to-analog converter. The present invention is suitable for driving a component such as an electro-optic modulator with a voltage in the kilovolt range. The circuit is stable at high frequencies and during pulse transients, and its impedance matching circuit matches the load impedance with the output impedance. The preferred embodiment comprises an input stage compatible with high-speed semiconductor components for amplifying the voltage of the input control signal, a buffer for isolating the input stage from the output stage; and a plurality of current amplifiers connected to the buffer. Each current amplifier is connected to a field effect transistor (FET), which switches a high voltage power supply to a transformer which then provides an output terminal for driving a load. The transformer comprises a plurality of transmission lines connected to the FETs and the load. The transformer changes the impedance and voltage of the output. The preferred embodiment also comprises a low voltage power supply for biasing the FETs at or near an operational voltage.
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patent: 4733194 (1988-03-01), Roehrs
Matick, Richard E., Transmission Line Pulse Transformers--Theory and Applications, Proc. IEEE, vol. 56, No. 1, Jan. 1986, pp. 47-62.
Christie David J.
Dallum Gregory E.
Carnahan L. E.
McFarland J. D.
Moser William R.
Mullins James B.
The United States of America as represented by the United States
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