An Integrated LC Oscillator with Self Compensation for Frequency Drift and PVT Corners Variations

摘要

This paper addresses the design of integrated LC oscillators with a central frequency of 1.024 GHz and frequency drift compensation suitable for space applications. The circuit uses a frequency divider, to have an output of 16 MHz allowing to replace an equivalent crystal oscillator. In order to compensate the frequency drift with temperature, a voltage controller connected to a varactor is considered. Moreover, to compensate for variations due to PVT corners, a calibration structure is considered. A temperature sensor generates the reference voltage to be used by the voltage controller. The designed LC Oscillator dissipates 27.8mW, while exhibiting ±256ppm frequency error over a temperature range between -10 °C and 90 °C and voltage supply variations of ±10%. The LC Oscillator was designed using a standard 130 nm CMOS Technology.