Integrated circuit having a dummy transimpedance amplifier

Details Integrated circuit having a dummy transimpedance amplifier Integrated circuit having a dummy transimpedance amplifier

2011-06-14

2011-06-14

Choe, Henry K (Department: 2817)

Amplifiers

With semiconductor amplifying device

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

C250S2140AG

Reexamination Certificate

active

07961053

ABSTRACT:
Consistent with the present disclosure, a “dummy” transimpedance amplifier (dummy TIA) is provided on a substrate along with one or more other transimpedance amplifiers (TIAs) that are connected to photodiodes and output voltage signals for further processing. Typically, the dummy TIA is not connected to a photodiode and does not supply a useful output. The dummy TIA, however, is subject to the same processing and temperature variations as the other TIAs, and, as a result, the voltage on the dummy TIA inverting input will be the same or substantially the same as that of the other TIAs. Thus, by sensing the dummy TIA inverting input voltage, an appropriate photodiode bias can be obtained without direct measurement of the voltage on the inverting inputs of the other TIAs.

REFERENCES:
patent: 6756578 (2004-06-01), Kaiser
patent: 6803825 (2004-10-01), Chiou et al.
patent: 6834165 (2004-12-01), Feng
patent: 6956439 (2005-10-01), Devnath

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