Programmable gain amplifier and transconductance compensation system
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United States of America Patent
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Jun 7, 2011
Issued Date -
N/A
app pub date -
Oct 12, 2009
filing date -
Oct 13, 2008
priority date (Note) -
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Abstract
A programmable gain amplifier (PGA) system comprises selectable parallel transconductors in a front end, independently selectable serial amplification circuits in a back end. The back end is configured to receive an output of the front end and may include a plurality of current or voltage mode amplifiers in series. The PGA system also includes control circuitry to select a gain configuration for the PGA by selecting selectable components in the front and back ends. The PGA system may additionally include control circuitry configured to change the transconductance of one or more of the front end transconductors such that the gain configurations of the PGA are independent of variations such as those due to temperature and fabrication. The PGA system may be used between a signal receiver and an analog to digital converter.
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