2012•Electronic Design EngineeringRequires access

A CMOS bandgap voltage reference source for audio ∑-ΔA/D converter

Jizuo Zhang

Abstract

An optimized PSR enhance stage was inserted in OPAMP of the classic CMOS bandgap voltage reference source,and one CMOS bandgap voltage reference source for audio ∑-ΔA/D converter was designed.It featured high power supply rejection ratio(PSRR) and low temperature coefficient with first-order temperature compensation.The circuit was implemented in SMIC 0.18-μm CMOS process.The simulation results in Cadence/Spectre showed that the circuit had a temperature coefficient of 9.699ppm/℃ at 1.8V supply voltage from-40℃ to 125℃ and a PSRR up to 90.2 dB(10 Hz) and 74.97 dB(20 kHz) at 27℃.

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Available abstract

Key concepts: Bandgap voltage reference, Power supply rejection ratio, CMOS, Voltage reference, Electrical engineering, Voltage, Temperature coefficient, Materials science