Title :
A nanopower double-mode 1-V frequency reference for an ultra-low-power capacitive sensor interface
Author :
Paavola, Matti ; Saukoski, Mikko ; Laiho, Mika ; Halonen, Kari
Author_Institution :
Electron. Circuit Design Lab., Helsinki Univ. of Technol., Espoo
Abstract :
In this paper, a nanopower CMOS frequency reference designed with a 0.25-mum BiCMOS process for an ultra- low-power capacitive sensor interface is presented. Due to the low supply voltage of 1 V, two parallel frequency references based on source-coupled CMOS multivibrators are used to implement the two required operating modes. In mode 1, when driving a 1 pF capacitive load at 24.6 kHz, the frequency reference consumes 210 nA. In mode 2, driving the same load at 307.2 kHz consumes 660 nA, respectively. Typical simulated frequency stabilities over the temperature and supply voltage ranges in modes 1 and 2 are plusmn10.7% and plusmn6.1 %, respectively. Simulated phase noises at 10 kHz offset frequency in mode 1, and at 100 kHz offset frequency in mode 2, are approximately -67 dBc/Hz and -68 dBc/Hz, respectively.
Keywords :
BiCMOS digital integrated circuits; CMOS digital integrated circuits; capacitive sensors; low-power electronics; multivibrators; nanotechnology; phase noise; BiCMOS process; nanopower CMOS frequency reference; nanopower double-mode 1-V frequency reference; parallel frequency references; simulated phase noises; source-coupled CMOS multivibrators; ultra-low-power capacitive sensor interface; Capacitive sensors; Capacitors; Circuits; Frequency; Resistors; Stability; Switches; Temperature distribution; Tuning; Voltage;
Conference_Titel :
Circuit Theory and Design, 2007. ECCTD 2007. 18th European Conference on
Conference_Location :
Seville
Print_ISBN :
978-1-4244-1341-6
Electronic_ISBN :
978-1-4244-1342-3
DOI :
10.1109/ECCTD.2007.4529547
