H - Electricity – 04 – B
Patent
H - Electricity
04
B
325/1
H04B 10/06 (2006.01) H03G 3/20 (2006.01) H03G 5/16 (2006.01) H04B 10/158 (2006.01) H04B 10/18 (2006.01)
Patent
CA 2021380
EOUALIZING AND AMPLIFYING CIRCUIT IN AN OPTICAL SIGNAL RECEIVING APPARATUS ABSTRACT OF THE DISCLOSURE Disclosed is an equalizing and amplifying circuit in an optical signal receiving apparatus comprising a preamplifier circuit (102a) having an input ter- minal (406) connected to the output of a light receiving element (101), the preamplifier circuit amplifying the electrical signal from the light receiving element to output an amplified signal, and comprising an automatic gain control circuit (103) connected to the output of said preamplifier circuit. The preamplifier cir- cuit (102a) comprises a transistor (402) having a common-base, a current source (403) connected to the emitter of the transistor, for supplying a bias current to the transistor, and a load resistor (404) connected to the collector of the transistor. The emitter of the transistor is connected to the input terminal (406), and the collector of the transistor is connected to the output terminal (409). Whereby, a negative influence caused by mounting the circuit on a package can be avoided and the circuit can operate stably in a high frequency range.
Amemiya Izumi
Arai Yasunari
Hamano Hiroshi
Ihara Takeshi
Yamamoto Takuji
Fujitsu Limited
Mcfadden Fincham
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