Accession Number : ADP002511

Title :   A New Digital TCXO (Temperature Compensated Crystal Oscillators) Circuit Using a Capacitor-Switch Array,

Corporate Author : NIPPON TELEGRAPH AND TELEPHONE PUBLIC CORP TOKYO MUSASHINO ELECTRICAL COMMUNICATION LAB

Personal Author(s) : Uno,T. ; Shimoda,Y.

Report Date : 1983

Pagination or Media Count : 8

Abstract : Recently, Digital TCXOs have been studied extensively, because of their high stability and rapid start-up time. However, they have the disadvantages of large circuit scale and high power dissipation. To solve these problems, it is necessary to develop an LSI circuit for TCXOs. This paper describes a new digital TCXO structure suitable for a C-MOS integrated circuit. A new and simple temperature compensation algorithm is also proposed. The TCXO circuit proposed here has a new crystal oscillation circuit directly controlled by a digital signal. This makes it possible to eliminate D/A converter and varactor diode used in conventional digital TCXOs. The new oscillation circuit is composed of an amplifer, a quartz resonator and a capacitor-switch array.

Descriptors :   *Crystal oscillators, *Integrated circuits, *Digital systems, Circuit analysis, Capacitors, Switches, Arrays, Temperature, Stability

Distribution Statement : APPROVED FOR PUBLIC RELEASE