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

Volume

3

fYear

2000

fDate

2000

Firstpage

17

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;

fLanguage

English

Publisher

ieee

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

Type

conf

DOI

10.1109/ISCAS.2000.855984

Filename

855984