Abstract
This paper presents a 1.2 V low-power rail-to-rail class AB operational amplifier (OpAmp) suitable for integrated lock-in amplifiers. The proposed OpAmp has been designed in a standard 0.18 μm CMOS technology. For a 1.2 V single supply and 81 μW power consumption, simulations shows a 86 dB open loop gain, 56o phase margin, 17 MHz unity gain frequency with 1 pF load and 97 dB CMRR. Adaptive biasing provides 33 V/μs slew-rate for a 1 pF capacitive load. A compact and reliable lock-in amplifier (LIA) has been designed using the proposed circuit. Post-layout results for noisy signals confirm the capability of the LIA to effectively recover information from signal-to-noise ratios down to -26 dB with errors below 4.2% up to 50 kHz and a power consumption of only 675 μW
| Original language | English |
|---|---|
| Title of host publication | 2013 European Conference on Circuit Theory and Design (ECCTD) |
| Publisher | IEEE |
| Pages | 1-4 |
| Number of pages | 4 |
| ISBN (Electronic) | 978-3-00-0043785-4 |
| DOIs | |
| Publication status | Published - 8 Sept 2013 |
Keywords
- CMOS integrated circuits
- low-power electronics
- operational amplifiers
- CMOS technology
- LIA
- adaptive biasing
- capacitance 1 pF
- class AB amplifier operational amplifier design
- gain 86 dB
- integrated lock-in amplifiers
- portable sensing systems
- power 675 muW
- power 81 muW
- signal-to-noise ratio
- size 0.18 mum
- voltage 1.2 V
- Gain
- Logic gates
- Mixers
- Operational amplifiers
- Power demand
- Transistors