S-Space College of Engineering/Engineering Practice School (공과대학/대학원) Dept. of Electrical and Computer Engineering (전기·정보공학부) Theses (Ph.D. / Sc.D._전기·정보공학부)
Design of Field-Programmable Mixed-Signal IC with Time-Domain Configurable Analog Block
가변기능형 아날로그 블록 기반의 현장 프로그램이 가능한 혼성 신호 집적회로의 설계
- 공과대학 전기·컴퓨터공학부
- Issue Date
- 서울대학교 대학원
- field-programmable mixed-signal IC; field-programmable analog array; reconfigurable architecture; reconfigurable analog array; mixed-signal IC
- 학위논문 (박사)-- 서울대학교 대학원 공과대학 전기·컴퓨터공학부, 2017. 8. 김재하.
- Fast-emerging electronic device applications demand a variety of new mixed-signal ICs to be developed in fast cycle and with low cost. While field-programmable gate arrays (FPGAs) are established solutions for timely and low-cost prototyping of digital systems, their counterpart for mixed-signal circuits is still an active area for research. This thesis presents a design of a field-programmable IC for analog/mixed-signal circuits, which solves many challenges with the previous works by performing analog functions in time domain.
In order to realize the field-programmable analog functionality, time-domain configurable analog block (TCAB) is proposed. A single TCAB can be programmed to various analog circuits, including a time-to-digital converter, digitally-controlled oscillator, digitally-controlled delay cell, digital pulse-width modulator, and phase interpolator. In addition, the TCABs convey and process analog information using the frequency, pulse width, delay, or phase of digital pulses or pulse sequences, rather than using analog voltage or current signals for less susceptibility to attenuation and noise. This analog information expressed in the digital pulses makes it easy to implement scalable programmable interconnects among the TCABs. The architecture of field-programmable IC capable of emulating todays diverse mixed-signal systems is also introduced. In addition to the TCABs, the proposed IC also includes arrays of configurable logic blocks (CLBs) and programmable arithmetic logic units (ALUs) for programmable digital functions. By programming the functionality of the TCAB, CLB, and ALU arrays and configuring the interconnects, the chip can implement various mixed-signal systems.
A prototype IC fabricated with 65-nm CMOS technology demonstrates the versatile programmability of the proposed TCAB and the IC by being successfully operated as a 1-GHz phase-locked loop with a 12.3-psrms integrated jitter, as a 50-MS/s analog-to-digital converter with a 32.5-dB SNDR, and as a 1.2-to-0.7V DC–DC converter with 95.5 % efficiency.