A new low-noise 100-MHz balanced relaxation oscillator

A novel fully balanced architecture for high-frequency, low-noise relaxation oscillators is presented. Differential operation is achieved with the use of two grounded capacitors utilizing the circuit parasitics. Bypassing of the regenerative memory function in the oscillator benefits both high-speed...

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Bibliographic Details
Published in:IEEE journal of solid-state circuits 1990-06, Vol.25 (3), p.692-698
Main Authors: Sneep, J.G., Verhoeven, C.J.M.
Format: Article
Language:English
Subjects:
Applied sciences
Capacitors
Circuit optimization
Circuit properties
Circuit testing
Electric, optical and optoelectronic circuits
Electronic circuits
Electronics
Exact sciences and technology
Frequency measurement
Noise measurement
Oscillators
Oscillators, resonators, synthetizers
Performance analysis
Phase measurement
Phase noise
Tuning
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Summary:A novel fully balanced architecture for high-frequency, low-noise relaxation oscillators is presented. Differential operation is achieved with the use of two grounded capacitors utilizing the circuit parasitics. Bypassing of the regenerative memory function in the oscillator benefits both high-speed and low-noise operation. A detailed analysis of phase noise in relaxation oscillators is performed. Results obtained from a test chip have verified the viability of the new oscillator and the developed phase-noise theory. The oscillator circuit has been realized in a medium-frequency (f/sub tau /=3 GHz) bipolar process. The tuning range extends to 150 MHz. At an oscillation frequency of 115 MHz, measured phase noise was -118 dBc/Hz at 1-MHz distance from the carrier.< >
ISSN:0018-9200
1558-173X
DOI:10.1109/4.102662