Patent ID: 8098104

Claim:
A device, comprising: an oscillator circuit comprising a frequency control input and configured to output an oscillator signal, a frequency of the oscillator signal depending on an input signal applied to the frequency control input; a control circuit configured to apply a first input signal value, a second input signal value, and a third input signal value to the frequency control input; a frequency detector circuit configured to detect a first frequency value of the oscillator signal when the first input signal value is applied to the frequency control input, a second frequency value of the oscillator signal when the second input signal value is applied to the frequency control input, and a third frequency value of the oscillator signal when the third input signal value is applied to the frequency control input; and a processor circuit configured to calculate, on the basis of the first input signal value, the second input signal value, the third input signal value, the first frequency value, the second frequency value, and the third frequency value, a second order coefficient of a polynomial oscillator characteristic relating values of the frequency of the oscillator signal to values of the input signal.