Amplifiers – With semiconductor amplifying device – Including field effect transistor
Patent
1995-05-23
1996-12-31
Mottola, Steven
Amplifiers
With semiconductor amplifying device
Including field effect transistor
330310, 381120, H03F 316
Patent
active
055897991
ABSTRACT:
A preamplifier for use with high impedance audio frequency transducers, having two capacitance coupled stages each including a field effect transistor connected in follower mode. The two stages provide an impedance converter. The first field effect transistor is of substantially smaller geometry than the second, providing a low noise, low input capacitance. The second stage further reduces output impedance while maintaining low power supply feedthrough. A capacitor connected in shunt between the stages is employed for frequency shaping.
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Instruments and Experimental Techniques, vol. 16, No. 3, May-Jun. 1973, pp. 837-838, article "A Thermally Durable Preamplifier" by I. N. Poznyak et al.
Edwin S. Oxner, FET Technology and Application, An Introduction, pp. 98, 99, published by Marcel Dekker, Inc., New York, 1989.
Collins James S.
Madaffari Peter L.
Mottola Steven
Tibbetts Industries, Inc.
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