Abstract
An ultrastable integrated CMOS oscillator capable of replacing crystal oscillators in many applications is presented. A stability of 7ppm°C−1 has been obtained between − 40 and + 100°C by employing a novel thermal compensation scheme based on the thermal properties of MOS transistors operated near their point of zero temperature coefficient. The frequency and thermal stability can be precisely adjusted with two ordinary external resistors or with two on-chip resistors. The power supply sensitivity can be made nearly zero in specified voltage ranges determined during construction.
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