TY - JOUR
T1 - A Four-Channel TDM Clocked-Analog LDO Using a Shared Compensation Block for Thermo-Optic Tuning
AU - Ye, Tianchi
AU - Ye, Kaixuan
AU - Xie, Ziying
AU - Tan, Min
N1 - Publisher Copyright:
© 2004-2012 IEEE.
PY - 2024/3/1
Y1 - 2024/3/1
N2 - This paper presents a four-channel time-division-multiplexing clocked-analog low-dropout regulator (TDM CLDO) using a novel current Miller compensation with a degenerated resistor (CMDR) block for thermo-optic tuning in silicon photonics. Previous TDM LDOs require a dedicated compensation capacitor for each channel because, during controller switching, one node of the compensation capacitor experiences large voltage variations that hinder multiplexing the capacitor. A novel CMDR block that is disconnected from voltage nodes with large variations is proposed to multiplex the compensation capacitor. Furthermore, Gray-code addressing technique is adopted to reduce the crosstalk between four channels caused by clock timing errors. Implemented in a 65 nm CMOS process, this design has a total chip area of 0.0047 mm2, which is 55% smaller than the conventional solution with four identical LDOs and consumes a quiescent current of 3.1 μA per channel. Measured results show that the presented four-channel TDM CLDO can simultaneously track four 1 Vpp sinusoidal signals up to 200 kHz. To our knowledge, this is the first time that a compensation capacitor is shared between different LDO channels.
AB - This paper presents a four-channel time-division-multiplexing clocked-analog low-dropout regulator (TDM CLDO) using a novel current Miller compensation with a degenerated resistor (CMDR) block for thermo-optic tuning in silicon photonics. Previous TDM LDOs require a dedicated compensation capacitor for each channel because, during controller switching, one node of the compensation capacitor experiences large voltage variations that hinder multiplexing the capacitor. A novel CMDR block that is disconnected from voltage nodes with large variations is proposed to multiplex the compensation capacitor. Furthermore, Gray-code addressing technique is adopted to reduce the crosstalk between four channels caused by clock timing errors. Implemented in a 65 nm CMOS process, this design has a total chip area of 0.0047 mm2, which is 55% smaller than the conventional solution with four identical LDOs and consumes a quiescent current of 3.1 μA per channel. Measured results show that the presented four-channel TDM CLDO can simultaneously track four 1 Vpp sinusoidal signals up to 200 kHz. To our knowledge, this is the first time that a compensation capacitor is shared between different LDO channels.
KW - 2024 OA procedure
KW - frequency compensation
KW - low-dropout regulator
KW - thermo-optic tuning
KW - Time-division multiplexing
KW - area reduction
UR - http://www.scopus.com/inward/record.url?scp=85179077645&partnerID=8YFLogxK
U2 - 10.1109/TCSI.2023.3334155
DO - 10.1109/TCSI.2023.3334155
M3 - Article
AN - SCOPUS:85179077645
SN - 1549-8328
VL - 71
SP - 1050
EP - 1060
JO - IEEE transactions on circuits and systems I: regular papers
JF - IEEE transactions on circuits and systems I: regular papers
IS - 3
ER -