The tuning range improvement of voltage controlled crystal oscillators by using multiple crystals in parallel

Author

Dayaratna, L.

Author_Institution

Lockheed Martin Commercial Space Syst., Newtown, PA, USA

fYear

2003

fDate

10-13 Aug. 2003

Firstpage

277

Lastpage

280

Abstract

This paper presents a wide tuning range voltage controlled crystal oscillator (VCXO) that uses several crystals in parallel. A number of crystals are connected in parallel to increase the tuning range of the oscillator. The parallel crystal combination is shown to be equivalent to a single crystal with a wide tuning range. This arrangement is ideal for applications requiring a larger tuning range. Generalized design equations are derived showing the tuning range relationship to the number of crystals in the circuit. This extended tuning range is demonstrated up to five crystals in parallel. The overall performances of wide tuning range VCXO circuits with multiple crystals are presented.

Keywords

circuit optimisation; circuit tuning; crystal oscillators; voltage-controlled oscillators; generalized design equations; multiple crystals in parallel; tuning range improvement; voltage controlled crystal oscillators; Capacitance; Circuit optimization; Circuit stability; Communication system control; Crystals; Phase noise; Resonant frequency; Tuning; Voltage control; Voltage-controlled oscillators;

fLanguage

English

Publisher

ieee

Conference_Titel

Radio and Wireless Conference, 2003. RAWCON '03. Proceedings

Print_ISBN

0-7803-7829-6

Type

conf

DOI

10.1109/RAWCON.2003.1227946

Filename

1227946