Journal ArticleDOI
Fast amplitude stabilization of an RC oscillator
Eric Vannerson,Kenneth C. Smith +1 more
TLDR
A technique is proposed for stabilizing the output amplitude of a variable-frequency RC sine-wave oscillator by converting amplitude to a d.c. voltage having only a small ripple content, which requires little filtering.Abstract:
A technique is proposed for stabilizing the output amplitude of a variable-frequency RC sine-wave oscillator. Amplitude settling time is reduced by converting amplitude to a d.c. voltage having only a small ripple content, which requires little filtering. A relationship between amplitude transient response and harmonic distortion is demonstrated, and the results are compared to those obtained by more conventional methods.read more
Citations
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Journal ArticleDOI
Class-C VCO With Amplitude Feedback Loop for Robust Start-Up and Enhanced Oscillation Swing
TL;DR: A feedback class-C voltage-controlled oscillator that has robust start-up and a large oscillation amplitude and transforms automatically into an amplitude-enhanced class- C VCO when it reaches steady-state to give improved noise performance is proposed.
Journal ArticleDOI
Continuous and switched-capacitor multiphase oscillators
Wasfy B. Mikhael,Shen Tu +1 more
TL;DR: In this article, the authors proposed multiphase oscillators based on active sequence discriminators (SD's) and two-integrator-loop circuits containing only capacitors, switches, and op amps.
Journal ArticleDOI
A 66 $\mu$ W 86 ppm $/^{\circ}$ C Fully-Integrated 6 MHz Wienbridge Oscillator With a 172 dB Phase Noise FOM
TL;DR: The design of a new Wienbridge topology is presented, suitable for use in wireless sensor nodes and time-based sensor readout circuitry, with phase noise performance, low temperature dependency and low power consumption.
Journal ArticleDOI
Generation, design and tuning of OTA-C high frequency sinusoidal oscillators
TL;DR: In this article, a general topology is given to implement sinusoidal oscillators by using operational transconductance amplifier capacitor (OTA-C) techniques, and five different structures are presented, taking into account the CMOS OTAs dominant non-idealities.
Journal ArticleDOI
A precise 90/spl deg/ quadrature OTA-C oscillator tunable in the 50-130-MHz range
Bernabe Linares-Barranco,Teresa Serrano-Gotarredona,J. Ramos-Martos,J. Ceballos-Caceres,J.M. Mora,Alejandro Linares-Barranco +5 more
TL;DR: A novel current-mode amplitude control scheme is developed that allows for very small amplitudes in a continuous-time sinusoidal operational transconductance amplifiers quadrature oscillator fabricated in a standard double-poly 0.8/spl mu/m CMOS process.
References
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Journal ArticleDOI
The Biquad: Part I-Some practical design considerations
TL;DR: In this paper, a comprehensive report on the Biquad, an active topology based on analog computer concepts, is given, where the authors describe the electrical characteristics of Biquads that make it a manufacturable realization for precision networks.
Journal ArticleDOI
A low-distortion oscillator with fast amplitude stabilization
Eric Vannerson,Kenneth C. Smith +1 more
TL;DR: In this paper, an improved technique was proposed for stabilizing the output of a variable-frequency RC sine-wave oscillator, which achieved very low harmonic distortion figures and fast amplitude settling together by sampling the peaks of the output waveform to produce a d.c. voltage having virtually no ripple content.
Journal ArticleDOI
Fast amplitude control of a harmonic oscillator
TL;DR: In this paper, the response time of an amplitude-controlled harmonic oscillator has been greatly reduced by the use of sampling techniques in the control loop, which has been shown to improve the performance of the oscillator.
Journal ArticleDOI
A harmonic oscillator with low harmonic distortion and stable amplitude
J. Pahor,J. Fettich,M. Tavzes +2 more
TL;DR: In this article, a generator of the harmonic signal is described for frequencies in the acoustic region with the reference stabilized amplitude, linear frequency scale and total harmonic distortion below 2 × 10−3, where the constant amplitude is maintained by periodic control of the first derivative value at the moments when x(t) crosses zero and has a positive slope.
Journal ArticleDOI
Design of an amplitude-stable sine-wave oscillator
TL;DR: As will be shown by employing integrated circuits, such as the /spl mu/A709, an amplitude stability of /spl plusmn/0.50 percent over a temperature range of -50/spl deg/C to 100/spl Deg/C can be achieved.