TUHH Open Research
 

A high-linearity high-stability dynamic amplifier

Publikationstyp
Journal Article
Date Issued
2026-07-30
Sprache
English
Author(s)
Yang, Jinkun  
Xu, Pengbin
Zhuang, Haoyu  
He, Weipeng
He, Yajuan  
Li, Qiang  
Integrated Circuits and Systems E-9  
TORE-URI
https://hdl.handle.net/11420/64859
Journal
IEEE transactions on circuits and systems II: Express Briefs  
Volume
73
Issue
9
Start Page
923
End Page
927
Citation
IEEE Transactions on Circuits and Systems II Express Briefs 73 (9): 923-927 (2026)
Publisher DOI
10.1109/TCSII.2026.3718428
Scopus ID
2-s2.0-105046340468
Publisher
IEEE
This brief presents an open-loop Gm-C dynamic amplifier with a high linearity and a high temperature and supply voltage stability. The main part of the amplifier employs two asymmetric differential pairs to enhance the transconductance linearity. The amplifier maintains a nearly constant gain of 23.29 dB within a differential input range of −40 to + 40 mV, and achieves a total harmonic distortion (THD) of −70.42 dB. Both the THD and voltage gain are better than other open-loop linear amplifiers, demonstrating that the proposed circuit offers an improved linearity and amplification capability. In addition, its input-referred noise (IRN) is 2.46 nV/ √Hz, lower than that of similar linear amplifiers. The biasing circuit of the amplifier adopts a constant-gm biasing circuit, which improves the temperature and supply voltage stability of the amplifier transconductance and voltage gain. When the differential input is 1 mV, the power supply voltage variation is ±10% around 5 V, and the temperature variation is −40 to + 120 + C, the standard deviation of voltage gain is 0.25093, and the range of voltage gain is from 13.99 to 15.05 times, indicating a better stability compared to the traditional Gm-C amplifiers.
Subjects
Gm-C dynamic amplifier
high-linearity
high-stability
Pipelined ADC
residue amplifier
DDC Class
620: Engineering