Circuit for varying gain of preamplifier

Details Circuit for varying gain of preamplifier Circuit for varying gain of preamplifier

2003-07-30

2009-10-06

Yam, Stephen (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

C250S2140AG, C398S210000, C330S308000

Reexamination Certificate

active

07598479

ABSTRACT:
A gain switching circuit switches a conversion gain of a preamplifier that is configured with a series circuit formed with a first resistor and a first switching element and a series circuit formed with a second resistor and a second switching element respectively connected in parallel with a feedback resistor. The gain switching circuit includes a first operating unit that generates a first switching element operating signal for closing the first switching element within a first gain switching period, and a second operating unit that generates a second switching element operating signal for closing the second switching element within a second gain switching period.

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English translation for JP 2000-315923.

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