A 1 MHz PVT compensated RC oscillator with $$\hbox {8 ppm}/^{\circ }\hbox {C}$$ frequency stability

Abstract

This paper presents a 1 MHz PVT compensated dual phase relaxation Oscillator. The oscillator core employs a current controlled voltage bias replica circuit to limit the charging of capacitor. Furthermore, the current starved schmitt trigger circuit is employed in oscillator in place of conventional power consuming comparators. They also provide stable switching threshold voltage across temperature variations. The oscillator is designed in 90 nm STMicroelectronics BCD technology and validated to work for supply variations of 1.0–1.32 V and temperature range from − 40 to 175 °C to suitable for automotive, industrial as well as consumer applications.