| 摘要 |
PURPOSE:To control a varactor, by giving a resonance frequency temperature coefficient of a crystal oscillator in a digital code series, providing an operating function in a control system, obtaining a resonance frequency deviation at an arbitrary temperature and processing the deviation. CONSTITUTION:A resonance frequency relative deviation DELTAf/f0 is expressed as a plynomial DELTAf/f0=A1DELTAT+A2(DELTAT)<2>+A3(DELTAT)<3>+A4(DELTAT)<4>+A5(DELTAT )<5>+...(1), where DELTAT is the temperature deviation from a reference temperature and An is the n-order temperature coefficient. The reference frequency temperature coefficient An of a crystal oscillator gives deviation information only to the reference value an, then the An is expressed as An=an+deltan...(2). First order temperature coefficients delta11, delta12,...delta1m1; second order temperature coefficients delta21, delta22...delta2m2;...; n-th order temperature coefficients deltan1,...deltanmn are inputted from a temperature coefficient information input terminal 9 to a temperature coefficient generating circuit 10, and the information corresponding to the temperature coefficients are given to an operation processing circuit 11. The circuit 11 obtains the resonance frequency deviation at an arbitrary temperature from equation (1) and performs signal processing. |
