Title :
One chip-low power digital-TCXO with sub-ppm accuracy
Author :
Lee, Se-Joong ; Han, Jin-Ho ; Seung-Ho Hank ; Lee, Joo-Ho ; Kim, Jung-Su ; Je, Min-Kyu ; Yoo, Hoi-Jun
Author_Institution :
Dept. of Electr. Eng., Korea Adv. Inst. of Sci. & Technol., Taejon, South Korea
Abstract :
The digital TCXO (DTCXO) has been studied extensively because of its high frequency accuracy and rapid start-up time. The value of compensation capacitance used in the DTCXO is stored in ROM or calculated by computing circuit. In this work, ROM and computing circuit are integrated together to obtain the merit of both schemes; accurate value and high resolution of compensation capacitance, respectively. The DTCXO contains a temperature sensor, A/D converter, controller, EEPROM, capacitor bank, and oscillator. The oscillation frequency can be pulled from ±25 ppm to the required frequency with sub-ppm accuracy. The maximum power consumption of the total chip is 6.6 mW at 3.3 V. The chip, die size of 9mm2, is fabricated by a 0.5 μm CMOS technology
Keywords :
CMOS integrated circuits; EPROM; automatic frequency control; capacitance; circuit stability; compensation; crystal oscillators; frequency stability; low-power electronics; mixed analogue-digital integrated circuits; temperature sensors; -40 to 85 C; 0.5 micron; 3.3 V; 6.6 mW; A/D converter; ADC; CMOS technology; EEPROM; ROM; capacitor bank; compensation capacitance; computing circuit; controller; high frequency accuracy; low power digital-TCXO; oscillator; rapid start-up time; sub-ppm accuracy; temperature sensor; CMOS technology; Capacitance; Capacitors; Circuits; EPROM; Frequency; Oscillators; Read only memory; Temperature control; Temperature sensors;
Conference_Titel :
Circuits and Systems, 2000. Proceedings. ISCAS 2000 Geneva. The 2000 IEEE International Symposium on
Conference_Location :
Geneva
Print_ISBN :
0-7803-5482-6
DOI :
10.1109/ISCAS.2000.855984
