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

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 <inline-formula> <tex-math notation="LaTeX">$0.35~\mu \text{m}$ </tex-math></inline-formula> standard CMOS process occupying an active area of <inline-formula> <tex-math notation="LaTeX">$0.22 \times 0.28$ </tex-math></inline-formula> mm<sup>2</sup>. The measured results show that the average TC is 3 ppm/°C −45 °C to 125 °C after trimming. The output reference voltage of 2.47 V can achieve <inline-formula> <tex-math notation="LaTeX">$3.6~\mu \text{V}$ </tex-math></inline-formula> (rms) noise from 0.1 to 10 Hz. In the supply voltage range of 2.6 to 5 V, the proposed BGR can deliver <inline-formula> <tex-math notation="LaTeX">$30~\mu \text{A}$ </tex-math></inline-formula> load current and its PSRR is about −83 dB @ 100Hz.

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