Relaxation oscillator

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

Relaxation oscillator with low drift and native offset cancellation

Abstract: Relaxation oscillator circuitry is presented with low drift and native offset cancellation, including an amplifier amplifying a first current signal to provide a pulse amplifier output waveform, an integrator integrating a second current signal to provide a ramp output waveform, and a comparator comparing the integrator output waveform with a threshold set by the amplifier output waveform to generate an alternating oscillator output used to switch the polarities of the first and second current signals.

A programmable clock oscillator for integrated sensor applications

Abstract: This gaper presents a programmable two-phase non-overlapping clock oscillator used for integrated sensors with wide operating temperature, low-cost and robust requirements. It is based on a proposed gain-enhanced VI converter to drive two one-shot timers arranged in a ring configuration together with the start-up circuit. Experimental results verify that the clock oscillation frequency varies less than 0.5% from temperature - 40° C to + 125° C in an integrated sensor interface for air-bag accelerometer. For a +/-IO% variation in supply, the frequency shifts +0.45/-0.83%. The measured frequencies of the sample ICs have a mean of 1.6% in deviation from the simulated 256 kHz and a standard derivation of 1.37%. The oscillator circuit occupies 0.26 mm2 using 0.8 pm CMOS technology.

Stable-relaxation-oscillation Nd lasers for long-pulse generation

Abstract: A simple method to produce high-energy neodymium (Nd) laser pulses with durations on the order of 1 mu s is described. Solid-state lasers can be pumped by relatively short flashlamp pulses to produce well-behaved relaxation oscillations in a diffusion-limited beam. Under the right conditions, each output laser pulse consists of a series of discrete subpulses that are ideally suited to efficient, high-energy amplification. Experimental results for an Nd:LiYF/sub 4/ oscillator/amplifier system are presented along with numerical simulations. These demonstrate that the system operation is predictable and well behaved. Data are also included for a Nd:glass tunable oscillator based on this concept. >

Temperature stable square wave oscillator

Abstract: An oscillator circuit with enhanced frequency characteristics is provided. This oscillator circuit includes a buffer (102) to amplify the output signal and provide a positive feedback, an inverter (106) to provide negative feedback to cause oscillation, a capacitive divider circuit (110, 112) for charge storage, a resistor (116) to provide controlled discharge, and a diode circuit (114) for providing frequency stability. Since frequency stability is included within the oscillator circuit, there may be no need to perform resistor trimming at the time of manufacture. Further, the capacitive divider circuit eliminates parasitic charge injection.

Digital light ballast oscillator

Abstract: An oscillator for a power converter control outputs a pulse train based on a charging time of a capacitor linked to a variable current source. A digital to analog converter (DAC) controls the variable current source in conjunction with a switch to determine the charging time of the capacitor. By varying the digital DAC input, the charging time of the capacitor is modified, thereby modifying the frequency of the pulse train. A comparator compares the capacitor voltage to a toggled threshold, which switches depending on whether the capacitor is charging or discharging. The comparator output supplies the pulse train that can be used in a half bridge switching arrangement for the power converter, which can also serve as an electronic ballast for a lamp.