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2009 WRI World Congress on Computer Science and Information Engineering
A 0.1 ppm Successive Approximation Frequency-Temperature Compensation Method for Temperature Compensated Crystal Oscillators (TCXO)
Los Angeles, California USA
March 31-April 02
ISBN: 978-0-7695-3507-4
In this paper, we present a high accurate frequency-temperature compensation method for Temperature Compensated Crystal Oscillators (TCXO) which can achieve 0.1 ppm frequency stability over a wide temperature range from -25˚C to 85˚C by using 1-bit successive approximation differentiated interpolation. By applying a frequency-temperature compensated digital binary word to a digital frequency synthesizer, the generated frequency signal is controlled so as to be temperature compensated. The presented method can be also used for the crystals with abnormal frequency-temperature curve such as with abrupt frequency jump points. Compared to the traditional look-up table method, the presented method can dramatically reduce the storage cost to about 5%. The presented method has been implemented into the Xilinx FPGA and CMOS standard cell ASIC. The test result shows that 0.1 ppm frequency-temperature stability can be achieved with a temperature sensitivity of 0.5˚C.
Index Terms:
TCXO, Successive Approximation
Citation:
Mi Zhang, Wei-xun Cao, "A 0.1 ppm Successive Approximation Frequency-Temperature Compensation Method for Temperature Compensated Crystal Oscillators (TCXO)," csie, vol. 3, pp.493-498, 2009 WRI World Congress on Computer Science and Information Engineering, 2009
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