Time Difference Amplifier with Robust Gain Using Closed-Loop Control

Toru NAKURA  Shingo MANDAI  Makoto IKEDA  Kunihiro ASADA  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E93-C   No.3   pp.303-308
Publication Date: 2010/03/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.E93.C.303
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Section on Circuits and Design Techniques for Advanced Large Scale Integration)
Category: 
Keyword: 
time difference amplifier,  TDA,  time to digital converter,  TDC,  voltage controlled delay line,  

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Summary: 
This paper presents a Time Difference Amplifier (TDA) that amplifies the input time difference into the output time difference. Cross coupled chains of variable delay cells with the same number of stages are applicable for TDA, and the gain is adjusted via the closed-loop control. The TDA was fabricated using 65 nm CMOS and the measurement results show that the time difference gain is 4.78 at a nominal power supply while the designed gain is 4.0. The gain is stable enough to be less than 1.4% gain shift under 10% power supply voltage fluctuation.