Fully differential class-AB OTA with improved CMRR

01 Pubblicazione su rivista
Centurelli Francesco, Monsurro' Pietro, Parisi Gaetano, Tommasino Pasquale, Trifiletti Alessandro
ISSN: 0218-1266

This paper presents a fully differential class-AB current mirror OTA that improves the common-mode behavior of a topology that presents very good differential-mode performance but poor common-mode rejection ratio (CMRR). The proposed solution requires a low-current auxiliary circuit driven by the input signal, to compensate the effect of the common-mode input component. Simulations in 40-nm CMOS technology show a net reduction of common-mode gain of more than 90dB without affecting the differential-mode behavior; a sample-And-hold amplifier exploiting the proposed amplifier has also been simulated.

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