Abstract
AbstractIn this paper, voltage controlled self‐temperature compensated oscillators made with NS‐GT cut quartz resonators (VC‐S‐TCXOs in what follows) are introduced and their frequency stability (obtained by controlling input voltage to VC‐S‐TCXO) is discussed. An oscillator circuit consists of a CMOS inverter, a variable capacitor diode, resistors, and capacitors. The primary oscillator frequency of the coupled quartz resonator is first derived from the electric equivalent circuit of the oscillator. The oscillator frequency is given by a function of the coupling coefficient, which in turn is given as a function of the load capacitance CL. Since frequency stability by controlling the input voltage to VC‐S‐TCXO is dictated by the VC circuit, the VC circuit was investigated in detail in order for the circuit independent of temperature to be obtained. Using the VC circuit, the oscillator frequency was controlled by the input voltage and the temperature stability of the oscillator frequency was less than 4 × 10−9 at a temperature range of ‐30 to 85 °C. Furthermore, it has been demonstrated experimentally that the frequency stability of the VC‐S‐TCXO directly after voltage control does not depend on the frequency temperature characteristics of the quartz resonator, time interval between the voltage control, or rate of temperature change.
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