For the design of inverter-based OTAs with differential input and single-ended output, the differential to single-ended (D2S) converter is a key building block. In fact, the performance of the D2S strongly affects the overall common-mode rejection ratio (CMRR) and input common-mode range (ICMR) of the whole OTA. In recent literature, inverter-based OTAs rely on a D2S topology based on an inverter driving another inverter with the input and output tight together which behaves as a “diode" connected device to implement a voltage gain approximately equal to -1. However, since this approach is based on the matching of the inverters, the performance of this D2S results sensitive to PVT variations if the bias point of the inverters is not properly stabilized. In this paper we present a novel topology of inverterbased D2S converter, exploiting an auxiliary, standard-cell-based, error amplifier and a local feedback loop. The proposed D2S, compared to the conventional one, exhibits higher CMRR, improved ICMR and better robustness with respect to PVT variations.We present also an ULV, standard-cell-based OTA, which exploits the proposed D2S converter and shows excellent performance figures of merit with low area footprint.

A Novel differential to single-ended converter for ultra-low-voltage inverter-based OTAs / DELLA SALA, Riccardo; Centurelli, Francesco; Scotti, Giuseppe. - In: IEEE ACCESS. - ISSN 2169-3536. - 10:(2022), pp. 98179-98190. [10.1109/ACCESS.2022.3206014]

A Novel differential to single-ended converter for ultra-low-voltage inverter-based OTAs

Riccardo Della Sala
Primo
;
Francesco Centurelli
Secondo
;
Giuseppe Scotti
Ultimo
2022

Abstract

For the design of inverter-based OTAs with differential input and single-ended output, the differential to single-ended (D2S) converter is a key building block. In fact, the performance of the D2S strongly affects the overall common-mode rejection ratio (CMRR) and input common-mode range (ICMR) of the whole OTA. In recent literature, inverter-based OTAs rely on a D2S topology based on an inverter driving another inverter with the input and output tight together which behaves as a “diode" connected device to implement a voltage gain approximately equal to -1. However, since this approach is based on the matching of the inverters, the performance of this D2S results sensitive to PVT variations if the bias point of the inverters is not properly stabilized. In this paper we present a novel topology of inverterbased D2S converter, exploiting an auxiliary, standard-cell-based, error amplifier and a local feedback loop. The proposed D2S, compared to the conventional one, exhibits higher CMRR, improved ICMR and better robustness with respect to PVT variations.We present also an ULV, standard-cell-based OTA, which exploits the proposed D2S converter and shows excellent performance figures of merit with low area footprint.
2022
fully synthesizable; inverter-based; standard-cell; ultra-low-voltage (ULV)
01 Pubblicazione su rivista::01a Articolo in rivista
A Novel differential to single-ended converter for ultra-low-voltage inverter-based OTAs / DELLA SALA, Riccardo; Centurelli, Francesco; Scotti, Giuseppe. - In: IEEE ACCESS. - ISSN 2169-3536. - 10:(2022), pp. 98179-98190. [10.1109/ACCESS.2022.3206014]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1654876
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