Topic
Relaxation oscillator
About: Relaxation oscillator is a research topic. Over the lifetime, 1952 publications have been published within this topic receiving 22326 citations.
Papers published on a yearly basis
Papers
More filters
01 Dec 2018
TL;DR: The proposed transceiver with 3.3mW power consumption and −110dBm sensitivity, features sub-cm ranging capability, better than the conventional designs with tens of centimeters resolution.
Abstract: A 3.75-4.25GHz frequency modulated continuous wave (FMCW) radar transceiver, employing intermediate-frequency (IF) delay rather than RF beat frequency to represent distance, is implemented in 65nm CMOS for applications in ultra-wideband (UWB) band. To overcome the trade-off between wide bandwidth and high ranging resolution in the conventional FMCW radars, a dual-BPF regenerative FM demodulator and a time-to-digital converter (TDC) are utilized to achieve low power, low complexity, and fine ranging resolution. In the transmitter, a slew rate controlled relaxation oscillator and a 3-stage RF voltage-controlled oscillator (VCO) are hired to perform frequency modulation with significant power savings. In addition, a successive approximation register (SAR) logic based automatic frequency calibration (AFC) loop is placed in the transmitter to calibrate the frequencies of the oscillators for process, voltage and temperature (PVT) robustness consideration. The proposed transceiver with 3.3mW power consumption and −110dBm sensitivity, features sub-cm ranging capability, better than the conventional designs with tens of centimeters resolution.
01 Oct 2017
TL;DR: In this paper, a circuit design technique for realization of a versatile interface circuit for capacitive and resistive sensors is presented, which is based on the use of operation of relaxation oscillator.
Abstract: This paper presents a circuit design technique for realization of a versatile interface circuit for capacitive and resistive sensors. The proposed method is based on the use of operation of relaxation oscillator. Time periods generated from two relaxation oscillators are employed for the reference signal and another sensing signal from sensor. The output signal obtained in the form of time period is proportional to the sensing value from sensor. The proposed approach provides the attraction in terms of simple configuration and low cost. The proposed circuit performances confirmed by the experimental results using commercial devices are agreed with the expected values.
TL;DR: In this paper, the authors considered the circuit synthesis of a particular type of voltage-to-frequency converter with a predetermined, but arbitrary, voltage to frequency characteristic, and showed that the voltage waveform out of such a network is a linear function of both the signal voltage and the diode current, the current being treated as an impulse discharge from some effective capacity.
Abstract: This paper considers the circuit synthesis of a particular type of voltage-to-frequency converter with a predetermined, but arbitrary, voltage-to-frequency characteristic. The basis of this converter is a relaxation oscillator consisting of a linear energy storage network, a combined signal and bias voltage source which provides power to the oscillator, and a single four-layer diode or similar relaxation switch. The paper first attempts to show what forms of characterization such a circuit might reasonably be expected to give in a voltage-to-frequency conversion. A more rigorous argument follows where it is shown that the voltage waveform out of such a network is a linear function of both the signal voltage and the diode current, the current being treated as an impulse discharge from some effective capacity. The sum equation, thus derived, can be solved using a remarkable theorem about the Mobius function of number theory to give the exact form of the desired impulse response of the linear network. As an example of the application and practical limitations of the approach, a network for a fractional root converter is derived and discussed in terms of a completed square-root converter.
01 Jan 1992
TL;DR: In this paper, it was shown that the introduction of delay in the coupling leads to a depression of the frequency of individual oscillators as well as of the average frequency of the system.
Abstract: We study systems of relaxation oscillators in the presence of nearest-neighbor coupling. It is shown that introduction of delay in the coupling leads to a depression of the frequency of individual oscillators as well as of the average frequency of the system. In certain parameter ranges, we also observe the existence of metastable states. Both phenomena can be understood in a simple mean-field like theory.
Patent•
04 Apr 1973
TL;DR: In this paper, a control system for a diesel engine has a square wave oscillator, the output from which is fed to the primary winding of a transformer having a secondary winding, the coupling between the windings being varied to vary the output of the secondary winding.
Abstract: A control system, particularly for a diesel engine, has a square wave oscillator, the output from which is fed to the primary winding of a transformer having a secondary winding, the coupling between the windings being varied to vary the output of the secondary winding. This signal can provide an input to a control circuit for determining the fuel supply to the engine, or can be used for other purposes.