Noise Reduction in High Resolution ADC
- Resource Type
- Conference
- Authors
- Hu, Yi; Li, Zhenguo; Hou, Jiali; Feng, Jingbin; Xiao, Zhiming; Hu, Weibo
- Source
- 2022 IEEE 6th Information Technology and Mechatronics Engineering Conference (ITOEC) Information Technology and Mechatronics Engineering Conference (ITOEC), 2022 IEEE 6th. 6:733-736 Mar, 2022
- Subject
- Communication, Networking and Broadcast Technologies
Computing and Processing
Engineering Profession
Robotics and Control Systems
Signal Processing and Analysis
Analytical models
Mechatronics
Simulation
Conferences
Noise reduction
Noise cancellation
Low-frequency noise
pipelined SA ADC
noise reduction technique
residual amplifier
auto zero technique
capacitive DAC
- Language
- ISSN
- 2693-289X
The pipelined successive approximation analog to digital converter is widely used to implement the Nyquist ADC with the resolution higher than 16 bits. Its residual amplifier can contribute a significant portion of ADC total noise. The paper proposes and analyzes a noise reduction technique which is based on the auto zero method. It can be used in a closed-loop amplifier with a resistor-feedback network to reduce low-frequency noise, especially 1/f noise. The amplifier inputs are shorted to amplify its own noise which is saved in 2 nd stage DAC. The saved noise would be subtracted from the amplified residual signal to remove low-frequency noises. The method is verified by an 18-bit SA-ADC in a 180-nm CMOS ADC. Simulation results show that the in-band noise contribution from the residual amplifier in the ADC output is reduced by about 40%.