Relaxation oscillator

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

Design of low power Voltage Controlled Oscillator

Abstract: This paper presents the design of low power Voltage Controlled Oscillator with differential stages. Circuit uses multiple pass loop architecture having primary and secondary (auxiliary feed forward) loops. In delay cell positive feedback is used with cross coupled regenerative PMOS load, due to that power consumption reduces. For best tuning range multiple delay path is used. Measurement shows that Oscillator has linear frequency voltage characteristics. This oscillator operates at 1.8V supply. After circuit designing, 2.17GHz–4.16GHz tuning rang, 2.57 GHz centre frequency with 3mw power consumption is obtained. Further to reduce power consumption of Voltage Controlled Oscillator, drain bulk connected PMOS load is used that works in sub-threshold region. If Bulk drain is connected it shows more linearity. By using Bulk drain connected transistor; Power Consumption reduces up to 165µw and frequency is 1.6GHz with tuning range 1.13GHz–2.6GHz.

A low-cost and accurate interface for conductivity sensors

Abstract: This paper presents a low-cost and accurate interface for four-electrode conductivity sensors. The interface mainly consists of an analog front-end, a multiplexer and a voltage-to-time converter. The analog front-end is used to provide a controlled excitation voltage signal for the sensor and to convert the sensor signal (conductivity) into a voltage signal. The voltage-to-time period converter acts as an asynchronous converter for the sensor signals (voltage) employing a relaxation oscillator which output is a period-modulated signal. Experimental results over a conductance range of 0.1 /spl mu/S to 20 mS show a random error of 0.32 /spl mu/S and a systematic error of 1.32 /spl mu/S for a measurement time of 400 ms.

Oscillator circuit with comparator

Abstract: An oscillator circuit with a comparator is provided, wherein the comparator has a supply input. A supply circuit supplies the comparator with a first current during a first section of an oscillator period of the oscillator circuit and with a second current greater than the first current during a second, different section of the oscillator period.