This work presents two-stage single-ended operational transconductance amplifiers (OTA) with very high voltage gain and rail-to-rail output voltage excursion. This is achieved by using improved composite transistors (ICT) with safe forward-bodybiasing, so the amplifier can be used with typical I/O supply voltages and high-VT thick-oxide transistors without significant parasitic substrate current. Two versions of the same OTA were designed and simulated using the open-source Skywater 130 nm PDK. The first version, made of only trapezoidal transistor arrays, achieves an 84 dB voltage gain, 1.33 MHz GBW, and 60◦ phase margin for a 10 pF capacitive load while demanding 122μW of power at 3.0 V power supply. The proposed ICT OTA version attains about the same specifications, except for its voltage gain, which has increased by 33 dB, thus reaching 121 dB.

Rail‑to‑rail input/output bulk driven class AB operational amplifier with improved composite transistors

Orazio Aiello
2023-01-01

Abstract

This work presents two-stage single-ended operational transconductance amplifiers (OTA) with very high voltage gain and rail-to-rail output voltage excursion. This is achieved by using improved composite transistors (ICT) with safe forward-bodybiasing, so the amplifier can be used with typical I/O supply voltages and high-VT thick-oxide transistors without significant parasitic substrate current. Two versions of the same OTA were designed and simulated using the open-source Skywater 130 nm PDK. The first version, made of only trapezoidal transistor arrays, achieves an 84 dB voltage gain, 1.33 MHz GBW, and 60◦ phase margin for a 10 pF capacitive load while demanding 122μW of power at 3.0 V power supply. The proposed ICT OTA version attains about the same specifications, except for its voltage gain, which has increased by 33 dB, thus reaching 121 dB.
File in questo prodotto:
File Dimensione Formato  
s10470-023-02160-0.pdf

accesso chiuso

Tipologia: Documento in versione editoriale
Dimensione 1.93 MB
Formato Adobe PDF
1.93 MB Adobe PDF   Visualizza/Apri   Richiedi una copia

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11567/1122963
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 1
  • ???jsp.display-item.citation.isi??? 1
social impact