Solid-state current transformer

Details Solid-state current transformer Solid-state current transformer

1975-06-23

1976-12-07

Mullins, James B.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

330 14, 330 28, 330 59, H01J 3912

Patent

active

039964620

ABSTRACT:
A signal transformation network which is uniquely characterized to exhibit a very low input impedance while maintaining a linear transfer characteristic when driven from a voltage source and when quiescently biased in the low microampere current range. In its simplest form, it consists of a tightly coupled two-transistor network in which a common emitter input stage is interconnected directly with an emitter follower stage to provide virtually 100 percent negative feedback to the base input of the common emitter stage. Bias to the network is supplied via the common tie point of the common emitter stage collector terminal and the emitter follower base stage terminal by a regulated constant current source, and the output of the circuit is taken from the collector of the emitter follower stage.

REFERENCES:
patent: 3383612 (1968-05-01), Harwood
patent: 3697882 (1972-10-01), Plassche
patent: 3717821 (1973-02-01), Amemiya et al.
patent: 3801820 (1974-04-01), Eichelberger et al.
patent: 3840819 (1974-10-01), Steckler

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