Integrated circuit having a variable-gain amplifier

Details Integrated circuit having a variable-gain amplifier Integrated circuit having a variable-gain amplifier

1992-12-21

1994-06-21

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including field effect transistor

330284, 455333, H03G 330, H04G 128

Patent

active

053231236

ABSTRACT:
An integrated circuit includes a variable-gain amplifier having a first transistor with a load arranged as an inverted and controlled by a first signal of a first frequency, and also having a branch comprising a capacitance in series with a transistor which is arranged as a variable resistance and whose impedance is modulated by a second signal of a second frequency. In this circuit the variable-gain amplifier comprises a second transistor with a load arranged as an inverter and disposed in series with the first transistor and its load between this load and a d.c. supply, in such a manner that the two inverter transistors share the same current, the second inverter being controlled by the output of the first inverter, and the impedance modulated by the second signal is coupled to a node between the load of the first inverter transistor and the second inverter transistor in order to modulate the gain of the latter.

REFERENCES:
patent: 3873932 (1975-03-01), Ishigaki et al.

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