Relaxation oscillator

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

Low-power relaxation oscillator and RFID tag using the same

Abstract: There is provided a low-power relaxation oscillator. The low-power relaxation oscillator may include: a constant current generation unit generating a current having a predetermined magnitude; a current varying unit controlling the current generated from the constant current generation unit according to a clock control signal to output the controlled current; a first controller and a second controller connected in parallel with output terminals of the current varying unit and passing or interrupting the current supplied from the current varying unit; a PMOS charging/discharging unit arranged between an output terminal of the first controller and an output terminal of the second controller; a first comparator and a second comparator connected to both ends of the PMOS charging/discharging unit, respectively, and each outputting a high or low level voltage upon receiving voltage charged in the PMOS charging/discharging unit; and a latch circuit delaying the voltages output from the first and second comparators to output oscillation signals.

Low cost telemeter for monitoring a battery and DC voltage converter power supply

Abstract: A telemetry circuit for monitoring the battery and DC-to-DC converter voltages of a projectile fuze which includes a frequency modulated transmitter to which signals are fed alternately from a pair of voltage-controlled oscillators. The output frequency of each voltage-controlled oscillator are determined by the battery voltage and the converter output voltage of a fuze circuitry, respectively. A constant frequency signal is provided by a relaxation oscillator to define the sampling rate by which the two DC voltages are monitored on a time-sharing basis. The constant frequency signal is fed to a pair of transistor switches which alternately disable each of the two voltage-controlled oscillators such that the outputs of each of the voltage-controlled oscillators, which comprise a frequency varying modulation signal, are alternately fed to the frequency modulated transmitter.

A low-voltage quadrature log-domain oscillator

Abstract: A new quadrature oscillator is proposed in bipolar technology. It exploits the exponential nature of bipolar transistors and thus it is suitable for low distortion operation at low supply voltage. The resulting circuits are very simple in structure and easy to design. The frequency of oscillation can be linearly controlled by the bias current. Simulation results in SPICE are given.

Relaxation oscillators with electrical control of periodicities of oscillation

Abstract: In this relaxation oscillator first and second electrically controlled constant current generators are used to provide proportionately related first and second currents to first and second terminals, respectively, between which the timing capacitor is connected. Set-reset, or R-S, flip-flop means is set and reset by the voltage at the first and second terminals, respectively, departing in a first sense from the voltage at a reference voltage bus by a predetermined amount. First switching means responds to the R-S flip-flop reset condition to complete a connection of the first terminal to the reference voltage bus and responds to the R-S flip-flop set condition to interrupt that connection. Second switching means responds to the R-S flip-flop set condition to complete a connection of the second terminal to the reference voltage bus and responds to the R-S flip-flop reset condition to interrupt that connection. The rate at which oscillations proceed is linearly related to the amplitudes of the proportionately related currents supplied by the first and second constant current generators.