Relaxation oscillator

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

CMOS interface of a flow sensor for urodynamic monitoring

Abstract: A signal conditioning CMOS integrated circuit is proposed for use with a micro-machined resistive flow sensor, adopted in order to non-invasively monitor urinary dysfunctions in male patients. The circuit is based on a relaxation oscillator with duty-cycle modulation and relative A/D conversion at chip level. The implemented resistive bridge-to-duty-cycle converter produces an output signal with duty-cycle highly linear in the change in resistance of the flow sensor's elements. The range of variability of the sensor resistors is a few hundreds of ohms in typical applications in the field of urology. Experimental tests with 1% precision resistors carried on the sensor interface evidenced a maximum non-linearity below 0.9% and a resolution of almost 7 bits, with a minimum measurable change in resistance less than 2 /spl Omega/ over the tested range. The proposed circuit, provided with digital output, also allows simple signal interfacing to any standard PC for data transfer and storage.

A Low Power Buffer-Feedback Oscillator with Current Reused Structure

Abstract: This paper presents a low power millimeter-wave oscillator consisting of a current-reused topology and buffer-feedback. By connecting a buffer-feedback topology between the core LC-tank of the oscillator and the output buffer stage, the simulated oscillation frequency of the proposed oscillator is increased by 17%, compared to that of the conventional current-reused oscillator. In addition, to obtain the same output power, the proposed oscillator reduces the power dissipation by 47%, compared to that of the conventional buffer-feedback oscillator. The prototype of the proposed oscillator is fabricated in a 65 nm CMOS technology with a size of 700 μm × 480 μm including pad. Measurement results indicate an oscillation frequency of 71.3 GHz, while dissipating 10 mA from a 1.6 V supply. key words: millimeter-wave, low power, buffer-feedback, oscillator

High voltage measuring device

Abstract: PURPOSE:To obtain a low power consumption type device by dispensing with a high voltage service power supply by setting a relaxation oscillation circuit utilizing a programmable unijunction transistor (PUT) to a principal constitutional element. CONSTITUTION:The primary resistance of high voltage equipment to be measured is subjected to resistance-type potential division and the voltage proportional to the primary voltage is inputted to a transmission part. An impulse current is applied to an infrared LED at the interval corresponding to input voltage in the transmission part to allow the LED to emit infrared rays. The infrared rays are sent to a receiving part 4, for example, through an optical cable 3. The interval of infrared rays is observed in the receiving part 4 and the presence of voltage or a voltage value is displayed. The transmission part 2 is constituted as a constant current type circuit keeping a current Id constant using a PUT as an active element to be allowed to function as a relaxation oscillator requiring no service power supply oscillated in the frequency proportional to input voltage Vcc and the output thereof is supplied to the LED to send out a light pulse.