Log compressing circuit providing capability of keeping clamp le

Details Log compressing circuit providing capability of keeping clamp le Log compressing circuit providing capability of keeping clamp le

1992-12-22

1994-04-19

Sikes, William L.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307546, 328145, G06G 724, H03D 100

Patent

active

053048733

ABSTRACT:
A log compressing circuit is arranged so that the clamping level is independent of the amplification factor of a first transistor for amplifying input current. The log compressing circuit includes the first transistor for amplifying input current, a compressing diode for log-compressing the amplified current, a clamp voltage generating diode serving as a source for generating a clamping voltage, and a second transistor for clamping the log-compressed voltage if the voltage goes beyond a predetermined clamp voltage. The second transistor has the same form as the first transistor and provides a collector connected to a cathode of the clamp voltage generating diode. The constant current is supplied to the second transistor from a constant current source.

REFERENCES:
patent: 4349755 (1982-09-01), Bee
patent: 4560919 (1985-12-01), Ishikawa et al.
patent: 4791325 (1988-12-01), McGinn
patent: 4843304 (1989-06-01), Merlo
patent: 5065053 (1991-11-01), Chan et al.

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