A $3.6~\mu\text{V}_{\mathrm{rms}}$ Noise, 3 ppm/°C TC Bandgap Reference With Offset/Noise Suppression and Five-Piece Linear Compensation

Abstract

This paper proposes a low-temperature coefficient (TC), noise, and offset bandgap reference (BGR) for the high precision applications. In order to reduce the offset voltage and noise introduced by the error amplifier, the offset and noise suppression technique is proposed. A five-piece linear compensation has been applied in the BGR to improve the TC performance. Moreover, an adaptive current loop is added to the bandgap reference to enhance the current driving capability. The proposed BGR is implemented in a 0.35 μm standard CMOS process occupying an active area of 0.22 × 0.28 mm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> . The measured results show that the average TC is 3 ppm/°C from -45°C to 125°C after trimming. The output reference voltage of 2.47 V can achieve 3.6 μV (rms) noise from 0.1 to 10 Hz. In the supply voltage range of 2.6 to 5 V, the proposed BGR can deliver 30 μA load current and its PSRR is about -83 dB @ 100Hz.