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A 0.25-V 90 dB PVT-stabilized four-stage OTA with linear Q-factor modulation and fast slew-rate enhancement for ultra-low supply ADCs

Dong, Siwan ; Wang, Wentao ; Tong, Xingyuan

International journal of electronics and communications, 2022-02, Vol.144, p.154044, Article 154044 [Periódico revisado por pares]

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Título:
A 0.25-V 90 dB PVT-stabilized four-stage OTA with linear Q-factor modulation and fast slew-rate enhancement for ultra-low supply ADCs
Autor: Dong, Siwan ; Wang, Wentao ; Tong, Xingyuan
Assuntos: ADC ; Bulk Driven ; Common-mode Compensation ; Four-Stage Amplifier ; PVT Stabilization ; Ultra-Low Power
É parte de: International journal of electronics and communications, 2022-02, Vol.144, p.154044, Article 154044
Descrição: A high gain and stability, four-stage OTA with a linear transistor Q-factor modulation compensation (TQM) and a fast, power-constrained slew-rate enhancement (PC-SRE) is proposed for ADCs working under ultra-low supply voltage. A rail-to-rail input & output bulk-driven fully differential four-stage operational amplifier with proposed structure is also presented under 0.25 V supply voltage. By using proposed structure, the response speed and stability of designed four-stage amplifier have been greatly improved. The effectiveness of the circuit has been verified in standard 65 nm CMOS process, the proposed three-stage amplifier has 90.9 dB DC-gain, 31.2 kHz unity-gain frequency, and 78.2° phase margin while consuming 32.8nW power, and occupying chip area of 0.00082 mm2 from a 0.25 V supply while driving a 100pF load.
Editor: Elsevier GmbH
Idioma: Inglês

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