A 66-dB SNDR Pipelined Split-ADC in 40-nm CMOS Using a Class-AB Residue Amplifier

A 66-dB SNDR Pipelined Split-ADC in 40-nm CMOS Using a Class-AB Residue Amplifier

Akter, S. (Broadcam Netherlands)
Sehgal, R.K. (Broadcam Netherlands)
van der Goes, Frank (Broadcam Netherlands)
Makinwa, K.A.A. (TU Delft Microelectronics)
Bult, K. (TU Delft Electronic Instrumentation)

Microelectronics

2018

This paper presents a closed-loop class-AB residue amplifier for pipelined analog-to-digital converters (ADCs). It consists of a push-pull structure with a ``split-capacitor'' biasing circuit that enhances its power efficiency. The amplifier is inherently quite linear, and so incomplete settling can be used to save power while still maintaining sufficient linearity. This also allows the amplifier's gain to be corrected by adjusting its bias current. When combined with digital gain-error detection, in this case the split-ADC technique, the result is a power-efficient gain calibration scheme. In a prototype pipelined ADC, this scheme converges in only 12,000 clock cycles. With a near-Nyquist input, the ADC achieves 66-dB SNDR and 77.3-dB SFDR at 53 MS/s. Implemented in 40-nm CMOS, it dissipates 9 mW, of which 0.83 mW is consumed in the residue amplifiers. This represents a 1.8x improvement in power efficiency compared to state-of-the-art class-AB residue amplifiers.

Analog gain correction
analog-to-digital conversion
Calibration
Capacitance
Capacitors
class-AB residue amplifier
Clocks
differential sampling
incomplete settling
Linearity
Power dissipation
split-ADC calibration
split-capacitor bias control technique.
Transistors

http://resolver.tudelft.nl/uuid:dc60a568-f9f1-4bce-b03c-d71d1b922612

https://doi.org/10.1109/JSSC.2018.2859415

2022-03-30

0018-9200

IEEE Journal of Solid State Circuits, 53 (10), 2939-2950

Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.

Institutional Repository

journal article

© 2018 S. Akter, R.K. Sehgal, Frank van der Goes, K.A.A. Makinwa, K. Bult