Title :
A continuous-time varactor-based temperature compensation circuit for floating-gate multipliers and inner-product circuits
Author :
Liang Zhou ; Chakrabartty, Shantanu
Author_Institution :
Dept. of Electr. & Comput. Eng., Michigan State Univ., East Lansing, MI, USA
Abstract :
Floating-gate (FG) transistors are commonly used in synthetic neural systems for implementing analog multipliers. However, conventional floating-gate multipliers are sensitive to variations in temperature which limit their application to only controlled environments. Previously, we had reported an off-chip temperature compensation algorithm for floating-gate current memories which used varactors to cancel out the temperature dependent factors. In this paper, we report a continuous-time circuit implementation of the temperature compensation algorithm and show that it enables on-chip implementation of temperature compensated current amplifiers and analog multipliers. Using measured results from fabricated prototypes in a 0.5μm CMOS process, we demonstrate the functionality of the compensation circuit and show that it leads to an order-of-magnitude lower temperature sensitivity for FG multipliers when compared to an uncompensated case.
Keywords :
CMOS analogue integrated circuits; analogue multipliers; current mirrors; varactors; CMOS process; analog multipliers; continuous-time circuit; continuous-time varactor; floating-gate current memories; floating-gate multipliers; inner-product circuits; off-chip temperature compensation; size 0.5 mum; temperature compensated current amplifiers; temperature compensation circuit; Logic gates; Temperature; Temperature dependence; Temperature measurement; Temperature sensors; Transistors; Varactors;
Conference_Titel :
Circuits and Systems (ISCAS), 2015 IEEE International Symposium on
Conference_Location :
Lisbon
DOI :
10.1109/ISCAS.2015.7169196