LOW POWER, LOW AREA, HIGH PSR, CURRENT MODE BANDGAP VOLTAGE REFERENCE

• Autor(a) principal: Lisboa, João
• Data de Publicação: 2023
• Tipo de documento: Dissertação
• Idioma: eng
• Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
• Texto Completo: http://hdl.handle.net/10362/162066
• topic: FinFET; BGR; Low Power; High PSR; Low Area; Domínio/Área Científica::Engenharia e Tecnologia::Nanotecnologia

Voltage references are electronic blocks whose purpose is to generate an output voltage that remains largely unaffected by external conditions, such as load, power supply, and temperature changes. These are critical components in Integrated Circuits (IC) typical functional blocks, such as Analog to Digital Converters and Digital to Analog Converters, low-dropout regulators, filters, among other analog and mixed-signal devices. With the ever-increasing diversity of IC circuits, a voltage reference with robust behavior in a wide range of applications is desirable. In this work, a robust, wide supply range, low power, high PSR, low area current mode Bandgap Voltage Reference (BGR) using Finfet Technology is developed and simulated. Besides the BGR core a “half-cascode” Operational Amplifier (OPAMP) and a Schmitt trigger start-up circuit were also developed. To ensure a robust functioning of the circuit, all simulations performed involve process, voltage and temperature (PVT) corner analysis. Additionally, a trimming Verilog-A script is developed with the purpose of enhancing the properties of the developed BGR. The proposed BGR design enables to choose an output voltage from 450 mV to 550 mV, functions in a supply range from 1.05 to 1.8 V and consumes from 21.6 to 62.9 A depending on the considered PVT corner. Across corners, simulations results show that the Temperature Coefficient (TC) ranges from 14.3 to 111 (ppm/ºC), the Line Regulation (LR) from 0.226 to 2.1 % and the Power Supply Rejection (PSR) from -29 to -53.5 dB. The area covered by the circuit was estimated to be around 0.0039 mm2. The trimming script does not have a big impact in terms of TC and LR but reduces the Monte Carlo (MC) variation significantly.