Protective circuit for the input transistor of a reception ampli

Details Protective circuit for the input transistor of a reception ampli Protective circuit for the input transistor of a reception ampli

1991-07-26

1993-03-16

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including protection means

324322, H03F 152

Patent

active

051948257

ABSTRACT:
A reception amplifier in a nuclear magnetic resonance system includes an input transistor. The base of the input transistor is connected to a protective circuit. The protective circuit shifts the voltage at the base-emitter path of the input transistor into the inhibit range only during a high-frequency transmission pulse. The voltage is produced by rectification of a fraction of the high-frequency transmission pulse. The protective circuit of the reception pre-amplifier prevents the input transistor from being gradually destroyed by an excessive base current during the transmission when voltage peaks are provided at the input.

REFERENCES:
patent: 2939949 (1960-06-01), Curtis
patent: 2993128 (1961-07-01), Carroll
patent: 4764726 (1988-08-01), Misic et al.
D. I. Hoult, The NMR Receiver: A Description and Analysis of Design, Progress in NMR Spectroscopy, vol. 12 pp. 49-51 (1978).

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