Amplifier circuit and light receiving apparatus

Details Amplifier circuit and light receiving apparatus Amplifier circuit and light receiving apparatus

2008-01-29

2008-01-29

Mottola, Steven J. (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including atomic particle or radiant energy impinging on a...

C330S086000

Reexamination Certificate

active

11282480

ABSTRACT:
An amplifier11to which transistors13and14functioning as variable resistors are connected in parallel is used. A burst signal is received by a light receiving element10and the received signal is converted into an input current signal Iin. The input current signal Iin is converted in the amplifier11into an output voltage Vo. Determination is made in a determining circuit20as to whether the output voltage Vo exceeds a current voltage V1which is a threshold. The result of determination is stored in a register circuit15. Based on the result of determination outputted from the register circuit15, a desired voltage is selected from among a number of voltages generated beforehand in a control voltage generating circuit. The selected voltage is used to generate a control voltage Vg1or Vg2to be applied to the transistors13and14; and the generated control voltage Vg1or Vg2is inputted to the transistor13or14of the amplifier11.

REFERENCES:
patent: 6246282 (2001-06-01), Oono et al.
patent: 7158729 (2007-01-01), Yokomizo
patent: 2003/0165207 (2003-09-01), Noguchi et al.
patent: 2006/0087378 (2006-04-01), Hayakawa
patent: 2001-144552 (2001-05-01), None
patent: 2003-198296 (2003-07-01), None

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