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US 10,845,440 B2Granted
Programmable gain amplifier with linear in dB gain control
AssigneeWaveguide Corporation
InventorsMichael Trakimas, Alexander Alexeyev
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Abstract
Various approaches of adjusting a gain of received signals in integrated circuitry include implementing an open-loop source-degenerated amplifier having a pair of input devices for amplifying the received signals; boosting an effective transconductance of the input devices (e.g., using a pair of super-gm feedback loops); and setting a bias current of devices in the open-loop source-degenerated amplifier (e.g., using a constant-gm bias circuit).
Claims10
An NMR apparatus comprising:
- an NMR coil configured to enclose a sample;
- a receiver comprising an analog front-end structure and a PGA for adjusting a gain of the front-end structure based at least in part on an amplitude of NMR signals received from the sample, the PGA comprising (i) an open-loop source-degenerated amplifier comprising a pair of input devices, (ii) a pair of super-gm feedback loops, each coupled to one of the input devices for boosting an effective transconductance thereof, and (iii) a constant-gm bias circuit for setting a bias current of devices in the open-loop source-degenerated amplifier;
- and
- a controller configured to analyze the received NMR signals.
1 more element
Dependencies are inferred from the claim text.