Transimpedance amplifier with dual gain outputs
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United States of America Patent
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Issued Date -
May 15, 2003
app pub date -
Nov 14, 2001
filing date -
Nov 14, 2001
priority date (Note) -
Abandoned
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Abstract
A transimpedance amplifier system includes a current source, such as a photodiode, coupled between two transimpedance amplifiers, each having feedback circuits with different impedances. Thus, for example, the cathode of a photodiode is coupled to a first transimpedance amplifier while the anode of the photodiode is coupled to the second transimpedance amplifier. Consequently, two voltage gains can be achieved without the use of conventional switched feedback circuits or the use of additional gain stages. A clamp circuit in parallel with one of the feedback circuits can be used to ensure that the both transimpedance amplifiers operate within their linear regions.
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