Relaxation oscillator

About: Relaxation oscillator is a research topic. Over the lifetime, 1952 publications have been published within this topic receiving 22326 citations.

Analysis of a source-coupled CMOS multivibrator

Abstract: The determinant of the system of nodal equations for a source-coupled CMOS multivibrator with drain clamping by active devices is calculated. Equating this determinant to zero allows the condition of transition from one quasistable state to another to be obtained. This condition is used to calculate the currents in the multivibrator transistors at the instant of transition. Then the voltage amplitude at the coupling capacitor is calculated and the oscillation frequency is found. The control characteristic (oscillation frequency versus level of the operating current) is evaluated. The results were verified experimentally. >

A General Theory of Injection Locking and Pulling in Electrical Oscillators—Part II: Amplitude Modulation in $LC$ Oscillators, Transient Behavior, and Frequency Division

Abstract: A number of specialized topics within the theory of injection locking and pulling are addressed. The material builds on our impulse sensitivity function (ISF)-based, time-synchronous model of electrical oscillators under the influence of a periodic injection. First, we show how the accuracy of this model for $LC$ oscillators under large injection is greatly enhanced by accounting for the injection’s effect on the oscillation amplitude. In doing so, we capture the asymmetry of the lock range as well as the distinct behaviors exhibited by different $LC$ oscillator topologies. Existing $LC$ oscillator injection locking and pulling theories in the literature are subsumed as special cases. Next, a transient analysis of the dynamics of injection pulling is carried out, both within and outside of the lock range. Finally, we show how our existing framework naturally accommodates locking onto superharmonic and subharmonic injections, leading to several design considerations for injection-locked frequency dividers (ILFDs) and the implementation of a low-power dual-modulus prescaler from an injection-locked ring oscillator. Our theoretical conclusions are supported by simulations and experimental data from a variety of $LC$ , ring, and relaxation oscillators.

Coolant level detector for engine cooling system

Abstract: In a liquid level detector for an engine cooling system an oscillator is arranged to apply a continuous output signal to a probe located in a liquid coolant reservoir presenting to the oscillator a variable electrical impedance according to the liquid level therein and a relaxation oscillator is operative in response to signals from said oscillator and arranged to actuate an indicator device giving intermittent visual and/or audible warning when the surface of the liquid coolant falls to below a predetermined level; a clamp circuit is arranged to inhibit operation of the relaxation oscillator when the surface of the liquid coolant is at or above the predetermined level and thereby improve the noise immunity of the detector.

High frequency voltage comparator circuit

Abstract: A voltage comparator circuit that is useful in A/D converters and D/A converters. The circuit comprises a comparison capacitor, a holding capacitor and input switching transistors. The holding capacitor holds the comparison voltage applied to it from the input switching transistors through the comparison capacitor. Therefore, the circuit can perform accurate voltage comparison even if the input voltages are sampled at a high sampling frequency.

1.1-μm-range tunnel junction VCSELs with 27-GHz relaxation oscillation frequency

Abstract: We have developed novel 1.1-μm-range InGaAs VCSELs with buried type-II tunnel junctions for high-speed optical interconnections. A relaxation oscillation frequency of 27 GHz was achieved. Error-free 30-Gbps operations were demonstrated using directly modulated multi-mode VCSELs.