Adjustable gain range current mirror

Details Adjustable gain range current mirror Adjustable gain range current mirror

1991-02-28

1994-06-14

Mullins, James B.

Telephonic communications

Substation or terminal circuitry

For loudspeaking terminal

330284, 330288, H04M 102, H03G 330

Patent

active

053217462

ABSTRACT:
A speakerphone with a varying gain current mirror circuit is provided. The varying gain current mirror circuit is within the DC control loop of the speakerphone such that by varying the gain of the current mirror circuit, the attenuation range of the speakerphone is correspondingly varied.

REFERENCES:
patent: 4259642 (1981-03-01), Derby
patent: 4720856 (1988-01-01), Pace et al.

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