Amplifiers – Signal feedback – Combined with control of bias voltage of signal amplifier
Patent
1975-12-05
1977-04-12
Mullins, James B.
Amplifiers
Signal feedback
Combined with control of bias voltage of signal amplifier
330 30D, H03G 330, H03F 345
Patent
active
040178048
ABSTRACT:
A broad band variable gain amplifier circuit for use as an automatic gain control amplifier with a differentially connected transistor pair as the basic amplifier element is described. Additional transistor circuits are provided so that the amplifier gain becomes a function of a simple ratio of a pair of D.C. bias currents that are applied to these transistor circuits. The gain function being proportional to a simple ratio of two bias currents provides the ability to simply vary the amplifier gain either hyperbolically or linearly. Also, the noise component and the variations of the D.C. component of the output are minimized by subtracting a D.C. current that is the D.C. component of the input current at the minimum amplifier gain less a D.C. current that is a function of the amplifier gain from the externally applied input current.
REFERENCES:
patent: 3891937 (1975-06-01), Bockelmann
Hewlett--Packard Company
Jones Allston L.
Mullins James B.
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