Abstract
Achieving low noise is becoming an important requirement in linear supply regulators for RF and mixed-signal SoC applications. A low-noise, low dropout regulator using switched-RC bandgap reference and a multi-loop, unconditionally stable error amplifier for output capacitor-less operation is presented. Switched-RC sample-and-hold filtered bandgap reference and current-mode chopped error amplifier techniques are used for reducing output noise of the LDO. A switched capacitor notch filter is used to ensure chopping ripple free output voltage. The proposed techniques reduce the 10Hz to 100kHz integrated output noise of the LDO from 95.3μVRMS to 14.8μVRMS. The LDO delivers a maximum load current of 100mA with a dropout voltage of 230mV and quiescent current consumption of 40μA. It achieves a PSR of 50dB at 10kHz for programmable output voltage range of 1V-3.3V. Fabricated in a 0.25μm CMOS process, the LDO core occupies an area of 0.18mm2.
Original language | English (US) |
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Title of host publication | Proceedings of the Custom Integrated Circuits Conference |
Publisher | Institute of Electrical and Electronics Engineers Inc. |
Volume | 2015-November |
ISBN (Print) | 9781479986828 |
DOIs | |
State | Published - Nov 25 2015 |
Event | IEEE Custom Integrated Circuits Conference, CICC 2015 - San Jose, United States Duration: Sep 28 2015 → Sep 30 2015 |
Other
Other | IEEE Custom Integrated Circuits Conference, CICC 2015 |
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Country/Territory | United States |
City | San Jose |
Period | 9/28/15 → 9/30/15 |
Keywords
- capacitor-less
- chopping
- LDO
- low dropout regulator
- low noise
- notch filter
- sample-and-hold
ASJC Scopus subject areas
- Electrical and Electronic Engineering