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Journal Article
Untrimmed BGR of 1.1% 3σ Based on Dynamic-Biased Op Amp With Reduced Voff
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- Authors
- Jayol Lee, Cheon-Soo Kim, Jang Hong Choi, Ki Su Kim, Bon Tae Koo
- Issue Date
- 2020-10
- Citation
- IEEE Transactions on Circuits and Systems II : Express Briefs, v.67, no.10, pp.1829-1833
- ISSN
- 1549-7747
- Publisher
- IEEE
- Language
- English
- Type
- Journal Article
- Abstract
- This brief presents an untrimmed sub-1V CMOS bandgap reference (BGR) where a dynamic-biased error amplifier (EA) is invented to accomplish small input-referred offset voltage ( $\text{V}_{\mathrm{ off}}$ ) and improve PSRR of BGR. In the dynamic-biased EA, an intended negative-feedback loop does dominantly work on the reduction of $\text{V}_{\mathrm{ off}}$ and supply noise influx. Simulation results confirm that $\text{V}_{\mathrm{ off}}$ of the proposed EA represents 2.3% distribution whereas each $\text{V}_{\mathrm{ off}}$ of the separate biased EA and the conventional EA shows 4.8% and 15% distributions, respectively. And the PSRR of the proposed EA-based BGR is increased by 23 dB comparing with the separate biased EA-based BGR around 2.5 MHz, and by 34 dB comparing with the conventional biased EA-based BGR around 1 MHz. By adopting the proposed feedback-biased EA, the 40-nm CMOS BGR circuit has been implemented to achieve superior $3\sigma $ inaccuracy of 1.1% and temperature variation of 13 ppm/°C without trimming.
- KSP Keywords
- Biased error, Error amplifier, Feedback Loop, Operational Amplifiers(Op-Amps), Sub-1V CMOS bandgap reference, Temperature variations, offset voltage, simulation results, supply noise(SN)