TY - GEN
T1 - Time-Based PWM controller for fully integrated high speed switching DC-DC converters-an alternative to conventional analog and digital controllers
AU - Khan, Qadeer A.
AU - Kim, Seong Joong
AU - Hanumolu, Pavan Kumar
N1 - Publisher Copyright:
© 2018 IEEE.
PY - 2018/3/27
Y1 - 2018/3/27
N2 - This tutorial discusses design of a highly integrated, low quiescent current continuous time PWM controller using time-based signal processing. By virtue of the continuous-Time digital nature of the time-based PWM controller, it is capable of achieving very high resolution and speed without using any error amplifier and large compensation capacitor or any high resolution A/D converter and digital PWM while preserving all the benefits of both analog and digital PWM controllers. Using time as the processing variable, the controller operates with CMOS-level digital-like signals but without adding any quantization error. A voltage/current controlled ring oscillator is used as an integrator in place of conventional opamp-RC or Gm-C integrator while a voltage/current controlled delay line is used to perform voltage-To-Time conversion. Starting with trade-offs with high speed design of conventional analog and digital PWM controllers, the concept of time based proportional-integral-derivative (PID) controller with complete architecture of a time-based buck converter is presented. The technique was successfully demonstrated on silicon with implementation of 10-25MHz single phase and 30-70MHz 4-phase buck converters on 180nm and 65nm CMOS processes, respectively.
AB - This tutorial discusses design of a highly integrated, low quiescent current continuous time PWM controller using time-based signal processing. By virtue of the continuous-Time digital nature of the time-based PWM controller, it is capable of achieving very high resolution and speed without using any error amplifier and large compensation capacitor or any high resolution A/D converter and digital PWM while preserving all the benefits of both analog and digital PWM controllers. Using time as the processing variable, the controller operates with CMOS-level digital-like signals but without adding any quantization error. A voltage/current controlled ring oscillator is used as an integrator in place of conventional opamp-RC or Gm-C integrator while a voltage/current controlled delay line is used to perform voltage-To-Time conversion. Starting with trade-offs with high speed design of conventional analog and digital PWM controllers, the concept of time based proportional-integral-derivative (PID) controller with complete architecture of a time-based buck converter is presented. The technique was successfully demonstrated on silicon with implementation of 10-25MHz single phase and 30-70MHz 4-phase buck converters on 180nm and 65nm CMOS processes, respectively.
KW - Buck converter
KW - Dc-dcconverter
KW - Digital pulse width modulation (DPWM)
KW - High switching frequency
KW - PID controller
KW - Power management
KW - Pulse width modulation (PWM)
KW - Ring oscillator.
KW - Timebased control
KW - VCO-based control
KW - VCO-based integrator
KW - Voltage controlled delay line (VCDL)
KW - Voltage controlled oscillator (VCO)
KW - Voltage regulator
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U2 - 10.1109/VLSID.2018.67
DO - 10.1109/VLSID.2018.67
M3 - Conference contribution
AN - SCOPUS:85046799496
T3 - Proceedings of the IEEE International Conference on VLSI Design
SP - 226
EP - 231
BT - Proceedings - 31st International Conference on VLSI Design, VLSID 2018 - Held concurrently with 17th International Conference on Embedded Systems, ES 2018
PB - IEEE Computer Society
T2 - 31st International Conference on VLSI Design, VLSID 2018
Y2 - 6 January 2018 through 10 January 2018
ER -