Amplifiers – With semiconductor amplifying device – Including atomic particle or radiant energy impinging on a...
Patent
1990-07-19
1992-05-12
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including atomic particle or radiant energy impinging on a...
250214A, 250214AG, H03F 1700
Patent
active
051131510
ABSTRACT:
Disclosed is an equalizing and amplifying circuit in an optical signal receiving apparatus comprising a preamplifier circuit having an input terminal connected to the output of a light receiving element. The preamplifier circuit amplifies the electrical signal from the light receiving element and outputs an amplified signal. An automatic gain control circuit is connected to the output of the preamplifier circuit. The preamplifier circuit comprises a transistor having a common-base, a current source connected to the emitter of the transistor for supplying a bias current to the transistor, and a load resistor connected to the collector of the transistor. The emitter of the transistor is connected to the input terminal, and the collector of the transistor is connected to the output terminal. A negative influence caused by mounting the circuit on a package is avoided and the circuit operates stably in a high frequency range.
REFERENCES:
patent: 4870369 (1989-09-01), Bartenstein et al.
Amemiya Izumi
Arai Yasunari
Hamano Hiroshi
Ihara Takeshi
Yamamoto Takuji
Fujitsu Limited
Mullins James B.
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