A 1.5MHz Time-Based Boost Converter with Feedback-PID for AMOLED Displays with Delay-Line-Based Line Feedforward

In recent years, time-based compensators have been investigated as a promising alternative to conventional analog control schemes for high-frequency DC-DC converters. As the voltage-mode time-based implementation lacks a PWM ramp generator, implementing a line feedforward is not straightforward. To solve this problem, a different type of compensator, referred to as feedback-PID (F-PID), has been used in this work. This compensator is composed of a proportional-integral forward path and a band-pass-filter feedback path, which can be easily modified to include the feedforward injection from the input voltage. In this paper, the proposed F-PID compensator is presented, and its implementation in a time-based compensator with delay-line-based line-feedforward is discussed. To verify the analysis, a prototype boost converter for AMOLED displays with a 1.5MHz switching frequency is realized in a 180nm BCD process. Measurement results show a 40mV peak-to-peak variation when an input voltage variation of 1V in 50μs is applied, and a duty-cycle RMS jitter of 1.5ns. The proposed controller occupies only 0.23mm2