Amplifiers – With semiconductor amplifying device – Including d.c. feedback bias control for stabilization
Patent
1977-08-10
1978-08-08
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including d.c. feedback bias control for stabilization
307299B, 330293, 330299, 330308, 330311, H03F 314
Patent
active
041059433
ABSTRACT:
The dynamic input impedance of a feedback current amplifier is varied such that a matching to the characteristic impedance of a line feeding the amplifier is achieved. An integrated negative feedback current amplifier has at least two amplifier stages and one inverse coupling branch from the amplifier input to the amplifier output. The active element of the last amplifier stage has a divided output circuit such that the output current is divided between the inverse coupling branch and the amplifier output. The input DC current is selected such that the dynamic amplifier input impedance is adjusted to the characteristic impedance of a line feeding the amplifier.
REFERENCES:
patent: 3710269 (1973-01-01), Fowler et al.
patent: 3725683 (1973-04-01), Anderson
patent: 3822387 (1974-07-01), Mulder
IEEE Journal of Solid-State Circuits, vol. SC-7, No. 5, Oct. 1972, pp. 340-351.
Mullins James B.
Siemens Aktiengesellschaft
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