Circuit and method for switching gains of preamplifier

Details Circuit and method for switching gains of preamplifier Circuit and method for switching gains of preamplifier

2006-01-24

2006-01-24

Choe, Henry (Department: 2817)

Amplifiers

With semiconductor amplifying device

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

C250S2140AG

Reexamination Certificate

active

06989717

ABSTRACT:
A pre-amplifier amplifies an output current of a photodetector that converts a burst optical signal into an electrical signal, and outputs an electric voltage signal. A gain switching circuit is connected with a serial circuit comprising a resistor and a switch and a serial circuit comprising a resistor and a switch, in parallel with a feedback resistor. The gain switching circuit includes an arrangement to receive the electric voltage signal output from the pre-amplifier, close the switch at a specific bit position, close the switch at the other specific bit position, upon occurrence of a situation that the switch is to be closed, provided that the switch is closed.

REFERENCES:
patent: 6140878 (2000-10-01), Masuta
patent: 6246282 (2001-06-01), Oono et al.
patent: 6246284 (2001-06-01), Nemoto
patent: 6307433 (2001-10-01), Ikeda
patent: 2000-252774 (2000-09-01), None
patent: 2000-315923 (2000-11-01), None
patent: 2001-144552 (2001-05-01), None
patent: 2001-196877 (2001-07-01), None

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