Article
Low-Voltage 0.81mW, 1-32 CMOS VGA with 5% Bandwidth variations and 38dB DC rejection
Author/s | Rico-Aniles, Héctor Daniel
Ramírez Angulo, Jaime Rocha-Pérez, José Miguel López-Martín, Antonio J. González Carvajal, Ramón ![]() ![]() ![]() ![]() ![]() ![]() ![]() |
Department | Universidad de Sevilla. Departamento de Ingeniería Electrónica |
Publication Date | 2020-06 |
Deposit Date | 2020-08-26 |
Published in |
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Abstract | A CMOS low-voltage amplifier with approximately constant bandwidth and DC rejection is introduced. The design is based on the cascade of a wide linear input range OTA, an op-amp and a servo-loop with extremely large time ... A CMOS low-voltage amplifier with approximately constant bandwidth and DC rejection is introduced. The design is based on the cascade of a wide linear input range OTA, an op-amp and a servo-loop with extremely large time constants. It operates with ±0.45V supplies and a power consumption of 0.81mW in 180nm technology. The bandwidth changes only from 9.08MHz to 9.54MHz over a gain range from 1 to 32, it has a 9.8Hz low cutoff frequency and a DC attenuation of 38dBs. DC floating voltage sources are used to keep the gates of all differential pairs at a constant value close to a supply rail in order to operate the amplifier circuit with minimum supply voltage. The proposed circuit has small and large signal figures of merit FOM SS = 5380 (MHz*pF/mW) and FOM LS = 0.0085((V/ns)*pF/mA) for a nominal gain A = 32. |
Project ID. | ES/1PE/TEC2016-80396
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Citation | Rico-Aniles, H.D., Ramírez Angulo, J., Rocha-Pérez, J.M., López-Martín, A.J. y González Carvajal, R. (2020). Low-Voltage 0.81mW, 1-32 CMOS VGA with 5% Bandwidth variations and 38dB DC rejection. IEEE Access, 8, 106310-106321. |
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