1. Relaxation oscillator with quadrature triangular and square waveform generation.
- Author
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Zhou, B., Rhee, W., and Wang, Z.
- Subjects
- *
COMPLEMENTARY metal oxide semiconductors , *RELAXATION oscillators , *COMPARATOR circuits , *ELECTRIC circuits , *CAPACITORS - Abstract
A CMOS relaxation oscillator which generates quadrature triangular and square waveforms is presented and fabricated in 0.18 µm CMOS. The proposed oscillator consists of cascaded two-stage charge-discharge full-differential circuits with sequential common-mode comparators based on cross-coupled connection. Experimental results show that the proposed oscillator generates quadrature-phase waveforms with less than 1% phase mismatch. The proposed oscillator also achieves a tuning range of more than 40% with digitally programmable timing capacitors and offers phase noise of -132 dBc/Hz at 1 MHz offset frequency. [ABSTRACT FROM AUTHOR]
- Published
- 2011
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