Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1978-02-03
1979-05-01
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330279, 330295, H03G 330
Patent
active
041526643
ABSTRACT:
A circuit is disclosed which provides first and second control voltages for controlling the gains of first and second variable gain amplifiers such that the relative gains provided by the first and second amplifiers can be varied while maintaining the total power gain provided by the first and second amplifiers substantially constant. The first and second control voltages are generated by passing first and second primary currents across semiconductor junctions. The first and second primary currents are controlled respectively by first and second secondary currents, the secondary currents being substantially proportional to the square of the respective primary current. The circuit allows the ratio of the secondary currents to be varied while maintaining the sum of the secondary currents substantially constant. The primary currents are thereby varied such that the sum of the squares of the primary currents remains substantially constant. The controlled variation in the primary currents causes the control voltages to vary in such a manner that the sum of the power gains provided by the first and second amplifiers remains substantially constant.
REFERENCES:
patent: 4063032 (1977-12-01), Willcocks
Glazer Marvin A.
Jones Maurice J.
Motorola Inc.
Mullins James B.
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