Amplifiers – With plural diverse-type amplifying devices
Patent
1989-11-01
1991-05-21
Mottola, Steven
Amplifiers
With plural diverse-type amplifying devices
330 98, H03F 500
Patent
active
050178849
ABSTRACT:
An improved transimpedance amplifier includes a common cathode-connected vacuum tube first stage, coupled to a common-drain-connected MOSFET second stage, and an optional common drain-connected MOSFET third stage. Preferably, capacitive feedback is coupled from the output of the second stage to the input of the vacuum tube stage, to control the transimpedance of the amplifier. The circuit takes advantages of the low stray inter-electrode capacitances, low delay and transit times of the vacuum tube and the high transconductance of the MOSFET second and optional third stages, in a way complementary to one another to form a high transimpedance amplifier whose characteristics are controlled almost exclusively by the feedback capacitance or other feedback impedance, rather than by gain and stray capacitance terms of individual devices. The resulting transimpedance amplifier is useful in a number of applications, for example, in audio preamplifiers and audio power amplifiers.
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patent: 4553108 (1985-11-01), Young
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J. Roberts et al., "Instrument Output Amplifier".
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N. Ya. Sedov, "A Universal Sepectrometric Preamplifier", Instruments and Experimental Techniques, vol. 19, No. 1, Pt. 2, pp. 153-154, Jan.-Feb. 1976; Plenum Publishing Corporation, New York.
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