Temperature compensated crystal oscillator (TCXO) with improved temperature compensation
US4951007A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 4, 1989 |
| Grant date | Aug 21, 1990 |
| Priority date | — |
| Expiry date | Oct 4, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03L1/023
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A TCXO including a series capacitance is improved by having the temperature ensitivity of the series load capacitance be chosen in accordance with the formula EQU T.sub.C.sbsb.L =T.sub.C.sbsb.o +2 T.sub.K /(1-.alpha..sub.o) wherein T.sub.C.sbsb.L is the temperature coefficient of the series load capacitor, T.sub.C.sbsb.o is the temperature coefficient of the resonator static capacitance, T.sub.K is the temperature coefficient of the piezoelectric coupling for the resonator, and .alpha..sub.o is the center value of load factor .alpha. and wherein the load factor, .alpha., is defined as ##EQU1## wherein C.sub.o is the resonator static capacitance and C.sub.L is the series load capacitance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.