Oscillation Circuit Evaluation Methods
Temperature Characteristics (2) <Drive level>
Since drive level is calculated by the following equation as described in drive level (1) , the temperature characteristics of the drive level are determined by the temperature characteristics of RL and i.
DL (μW) = RL (Ω)×i2 (mA)
DL: drive level
RL: load resonance resistance of crystal unit
i: Current value flowing through crystal unit (RMS value)
1. Temperature Characteristics in "RL: load resonance resistance in crystal unit"
In operating temperature range specified in the specification sheets, RL is almost the same.
2. Temperature characteristics of " i: Current value (RMS value) flowing through crystal unit"
The resistance temperature coefficient of the circuit board itself causes i to be slightly increased or decreased, but it is generally unchanged.
This means that drive level remains almost unchanged even if the temperature changes.