Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1995-06-06
1996-06-18
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330 85, 330260, 330294, H03F 345
Patent
active
055281974
ABSTRACT:
A current mode VCA includes a negative feedback architecture around a gain core stage. An input signal is injected as a differential current into the signal path and is converted to a differential voltage by a transresistance stage having a dynamic impedance. The differential voltage is applied to a transconductance stage which limits the VCA's high frequency gain and stabilizes the feedback loop. The transconductance stage supplies a differential drive current to the gain core stage, which produces two differential output currents that sum to the differential drive current. The fraction of the drive current provided to each output current is controlled by the application of a control signal to the gain core stage. A current-to-voltage converter produces an output voltage in response to the output current. A differential feedback current is returned to the transresistance stage to complete the negative feedback loop and control the dynamic impedance of the transresistance stage to compensate for the gain extracted from the VCA and maintain constant loop gain.
REFERENCES:
patent: 3714462 (1973-01-01), Blackmer
patent: 4451798 (1984-05-01), Yokoyama
"Voltage-Controlled Amplifier/OVCE", model SSM-2018 produced by Analog Devices, Inc., 1981.
Analog Devices Inc.
Mullins James B.
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