5-MHz Pseudo-differential Current-mode CMOS Relaxation VCO with Temperature Stability of 41.8 ppm/degrees C
- Authors
- Oh, Juntaek; Yang, Jong-Ryul
- Issue Date
- Dec-2019
- Publisher
- IEEK PUBLICATION CENTER
- Keywords
- CMOS; current mode; low power; pseudo differential; relaxation oscillator; temperature compensation
- Citation
- JOURNAL OF SEMICONDUCTOR TECHNOLOGY AND SCIENCE, v.19, no.6, pp.608 - 612
- Journal Title
- JOURNAL OF SEMICONDUCTOR TECHNOLOGY AND SCIENCE
- Volume
- 19
- Number
- 6
- Start Page
- 608
- End Page
- 612
- URI
- http://scholarworks.bwise.kr/ssu/handle/2018.sw.ssu/38838
- DOI
- 10.5573/JSTS.2019.19.6.608
- ISSN
- 1598-1657
- Abstract
- This letter presents a pseudo-differential current-mode relaxation voltage-controlled oscillator for small form factor applications. A pseudo-differential current-mode comparator with a temperature compensated RC circuit was composed both to obtain half duty cycle and have a constant charge and discharge time with temperature change. A current source with two types of gate-oxide transistor combinations was able to obtain the reference voltage and had an ultra-low temperature coefficient, thus mitigating frequency variation with regard to temperature. The proposed voltage-controlled oscillator was implemented in a low power 65-nm CMOS process and occupied 0.011 mm(2). Measurements showed that the voltage-controlled oscillator operated at 4.75-5.09 MHz with a supply voltage of 1.0 V, and its DC power consumption was 40 mu W including a 3-stage buffer. A low frequency variation of 41.8 ppm/degrees C was achieved for the temperature range of 20 to 100 degrees C.
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