Title :
A 0.18-μm CMOS fully integrated 0.7–6 GHz PLL-based complex dielectric spectroscopy system
Author :
Elhadidy, Osama ; Shakib, Sherif ; Krenek, Keith ; Palermo, Samuel ; Entesari, Kamran
Author_Institution :
Analog & Mixed-Signal Center, Texas A&M Univ., College Station, TX, USA
Abstract :
A fully-integrated sensing system utilizes a ring oscillator-based phase locked loop (PLL) for wideband complex dielectric spectroscopy of materials under test (MUT). Characterization of both real and imaginary MUT permittivity is achieved with frequency-shift measurements between a sensing oscillator, with a frequency that varies with MUT-induced changes in capacitance and conductance of a delay-cell load, and an amplitude-locked loop (ALL)-controlled MUT-insensitive reference oscillator. Fabricated in 0.18-μm CMOS, the 0.7-6 GHz spectroscopy system occupies 6.25 mm2 area and achieves 3.7% maximum permittivity error.
Keywords :
CMOS integrated circuits; MMIC oscillators; permittivity measurement; phase locked loops; CMOS fully integrated PLL; amplitude locked loop; delay-cell load; frequency 0.7 GHz to 6 GHz; materials under test; reference oscillator; ring oscillator based phase locked loop; size 0.18 mum; wideband complex dielectric spectroscopy; CMOS integrated circuits; Dielectrics; Frequency measurement; Oscillators; Permittivity; Sensors; Spectroscopy;
Conference_Titel :
Custom Integrated Circuits Conference (CICC), 2014 IEEE Proceedings of the
Conference_Location :
San Jose, CA
DOI :
10.1109/CICC.2014.6945984
