Gain control cell

Details Gain control cell Gain control cell

1987-07-14

1988-08-09

LaRoche, Eugene R.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

330254, 330257, 330288, G06G 712, H03F 345

Patent

active

047630248

ABSTRACT:
A gain control cell comprises an input stage (10) having first (12) and second (13) input nodes and including a first current mirror (T.sub.14), and an output stage (11) having an output node (14) and including a second current mirror (T.sub.15). The input stage (10) is biased by a first current source I.sub.11 and the output stage (11) is biased by a second current source I.sub.12, the gain of the cell being defined by the ratio of the two current sources. The two current mirrors are matched so that errors due to the finite current gains of the current mirrors compensate for each other. The quiescent output current is thus substantially independent of the current gains of the pnp transistors used in the current mirrors.

REFERENCES:
patent: 3761741 (1973-09-01), Hoeft
patent: 4288707 (1981-09-01), Katakura
patent: 4459555 (1984-07-01), Jett, Jr.
patent: 4568840 (1986-02-01), Kenji

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