Cascaded internal impedance dependent amplifier with accurate va

Details Cascaded internal impedance dependent amplifier with accurate va Cascaded internal impedance dependent amplifier with accurate va

1985-12-16

1987-06-30

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including gain control means

330289, 330311, H03G 330

Patent

active

046773924

ABSTRACT:
An internal impedance dependent amplifier has a gain as determined by the impedance at a predetermined node within the amplifier. A PIN diode is coupled to the predetermined node. The PIN diode is driven with a forward biased current which serves as the accurate gain control (AGC) signal for the amplifier. In the preferred embodiment, the PIN diode is driven by an operational amplifier in such a manner that the impedance thus coupled to the predetermined node in the amplifier is temperature independent. Because the PIN diode has an impedance given by:

REFERENCES:
patent: 3942181 (1976-03-01), Berrod et al.
patent: 4464635 (1984-08-01), Rypkema
patent: 4524331 (1985-06-01), Faith

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