Accession Number : ADP001573

Title :   A Temperature Compensated SC Cut Quartz Crystal Oscillator,


Personal Author(s) : Miguel,Edward K.

Report Date : 1982

Pagination or Media Count : 13

Abstract : A method of temperature compensating a pullable Sc Cut quartz crystal is presented. The B and C modes of the SC Cut are resonated simultaneously. The B mode is used as a temperature sensor which has a linearity of -25 ppm/degrees C. The C mode is compensated using the temperature information from the B mode. A dual mode oscillator is developed which allows the frequency of the C mode to be controlled without affecting the B mode. A digital compensation method uses a RAM for on board information storage and programming. The address to the RAM is temperature generated and the output of the RAM is converted to a voltage to control the C mode oscillator. The compensation information is programmed automatically, during a temperature slew of 1.5 degrees C/min., using a phase-locked-loop, an up/down counter and a track-and-hold circuit all of which are connected to the oscillator only during the programming step.

Descriptors :   *Frequency, *Control, *Symposia, *Crystal oscillators, *Quartz, Temperature, Compensation, Dual mode, Computer programming, Data storage systems

Distribution Statement : APPROVED FOR PUBLIC RELEASE