Programmable Gain Amplifier and Transconductance Compensation System
First Claim
1. A system comprising:
- a programmable gain amplifier includinga from end having a plurality of selectable transconductors arranged in parallel, anda back end configured to receive an output of the front end and having a plurality of selectable current gain stages arranged in series; and
a control circuit configured to change the transconductance of one or more of the plurality of selectable transconductors such that the gain configurations of the programmable gain amplifier are independent of temperature variations.
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Accused Products
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.
103 Citations
31 Claims
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1. A system comprising:
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a programmable gain amplifier including a from end having a plurality of selectable transconductors arranged in parallel, and a back end configured to receive an output of the front end and having a plurality of selectable current gain stages arranged in series; and a control circuit configured to change the transconductance of one or more of the plurality of selectable transconductors such that the gain configurations of the programmable gain amplifier are independent of temperature variations. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A system comprising:
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a programmable gain amplifier including a front end having a plurality of selectable transconductors arranged in parallel; a back end configured to receive an output of the front end and having a plurality of selectable current gain stages arranged in series; and a control circuit configured to change a gain of the programmable gain amplifier by selecting a transconductor in the front end or by selecting a current gain stage in the back end. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24)
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25. A method comprising:
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generating a first transconductance measure with a first circuit; comparing the first transconductance measure to a first target; maintaining a first negative feedback voltage to control the first circuit based on the comparison of the first transconductance measure to the first target; and controlling a programmable gain amplifier with the first negative feedback voltage. - View Dependent Claims (26, 27, 28, 29, 30, 31)
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Specification