Title :
High Resolution CMOS Current Comparators
Author :
Domínguez-Castro, R. ; Rodríguez-Vázquez, A. ; Medeiro, F. ; Huertas, J.L.
Author_Institution :
Dept. of Analog Design, CNM, Sevilla, Spain
Abstract :
A 2μm CMOS current comparator prototype is presented with an input current comparison range of 140dB and virtual zero offset (<;10pA). The circuit uses capacitive sensing for high resolution and nonlinear feedback to achieve small input voltage variations in the complete input current range. Operation speed for low current is about two orders of magnitude larger than for conventional circuits. Simplified modeling issues are used to compare alternative comparator architectures.
Keywords :
CMOS integrated circuits; capacitive sensors; current comparators; capacitive sensing; high resolution CMOS current comparators; nonlinear feedback; size 2 mum; Analog-digital conversion; CMOS technology; Circuit testing; Digital signal processing; Feedback circuits; Impedance; Semiconductor device modeling; Signal resolution; Virtual prototyping; Voltage;
Conference_Titel :
Solid-State Circuits Conference, 1992. ESSCIRC '92. Eighteenth European
Conference_Location :
Copenhagen
Print_ISBN :
87-984232-0-7
DOI :
10.1109/ESSCIRC.1992.5468214
