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Temperature induced frequency deviation of quartz crystal oscillators can be reduced by tuning the oscillator to compensate for the thermal effects. A varactor tuned AT cut resonator is typically used to make a voltage controlled crystal oscillator. Compensation is then achieved by applying a "compensation voltage" to the varactor. The earliest compensation circuits comprised resistors and thermistors. Over the temperature range -40° C to +85°C resistive compensation circuits have achieveddoi:10.21954/ou.ro.0001015d fatcat:libgnsxirvdvlfxdqq2j5zgy5q