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Research and design of digital control DC-DC converter in the ADC

Author: YeXin
Tutor: LuoPing
School: University of Electronic Science and Technology
Course: Microelectronics and Solid State Electronics
Keywords: Differential ring oscillator ADC Digital Power DC-DC converter
CLC: TM46
Type: Master's thesis
Year: 2011
Downloads: 86
Quote: 0
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Abstract

In recent years, the sudden emergence of the digital power is developing rapidly. Power compared to traditional analog control, digital control power supply is easy to integrate, easy to configure, and high flexibility. With the progress of technology in the nano-level technology, analog circuit design problems encountered match, noise, and the effective gain, integrated digital control power technology can be achieved with process compatibility with more obvious. Therefore, for SoC applications need to integrate power management features, the advantages of digital power is particularly evident. Typical digital control of the DC-DC converter, by the Analog-to-Digital Converter (ADCs, Analog to Digital Converter) is responsible for comparing the feedback voltage with a reference voltage magnitude and converts it to a digital error signal, and then through the digital compensator (Digital Compensator ) appropriate compensation last a duty cycle of digital pulse-width modulator (DPWM, Digital Pulse Width Modulation) signal, the regulation and control of digital closed-loop system. Among them, the accuracy of the ADC determines the accuracy of digital control of the DC-DC converter, the gain of the ADC is also contributed to the system gain. Unlike traditional ADC, digital control DC-DC converter also proposed new requirements of the ADC in the area, conversion speed and power consumption, etc. issue. The traditional ADC is not suitable for direct use in digital power applications in digital power, the new structure of the ADC is very necessary. In this paper, the analysis of digital power system ADC indicator requirements based on the summary of the currently used ADC structure were analyzed and compared. On this basis, this paper based on 0.13μm CMOS process, designed one for digitally controlled DC-DC converter ADC structure differential ring oscillator ADCs. The differential ring oscillation ADC operational transconductance amplifier (OTA, Operational Transconductance Amplifier) ??and two current control oscillator and digital counter. OTA as ADC module analog front end (AFE Analog Front End), the differential input voltage is converted to a differential current, large common-mode input range; difference between the output of the counting results of the two flow control oscillator shows the input current The deviation, with a good process stability. In this paper, the differential ring oscillator ADC structure is proportional to absolute temperature (PTAT Proportional to absolute temperature) current bias, to further suppress the temperature sensitivity of the process parameters. The ADC design OTA and differential ring oscillator based on the overall simulation described in this article ADC to 20mV least significant bit (LSB Least Significant Bit), DNL 0.641, INL to 1.643. 2MHz sampling rate, power consumption (including analog and digital post-processing part) 380μW (analog part of the power supply 3.3V, the digital part of the power supply 1.2V). Finally, differential ring oscillator the ADC after back-end design and verification, application in a digitally controlled DC-DC converter chip. This digitally controlled DC-DC converter chip using 0.13μm 1P8M CMOS process flow sheet. The test results show that the differential ring oscillator design ADC showed a good performance. Whole converter chip is stable and reliable, with high load regulation and transient response capability.

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