Variable impedance circuit

Details Variable impedance circuit Variable impedance circuit

1983-05-03

1985-05-14

Beha, Jr., William H.

Electricity: power supply or regulation systems

External or operator controlled

Using an impedance as the final control device

307264, 323315, H03H 1100

Patent

active

045175080

ABSTRACT:
A variable impedance circuit is disclosed which comprises a pair of diodes having their cathodes connected together, a first current source coupled to the connection between the diodes, and a second and a third current source which are connected to the anodes of the diodes respectively. The second and third current sources are controlled by means of current mirror circuits so that equal forward currents are caused to flow therefrom to the paired diodes, thus making it possible to set up a desired impedance variation range.

REFERENCES:
patent: 4066914 (1978-01-01), Gundry
patent: 4179650 (1979-12-01), Fukushima et al.
patent: 4220875 (1980-09-01), Lawton
patent: 4288707 (1981-09-01), Katakura
patent: 4339677 (1982-07-01), Hoeft

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