Logarithmic amplifier calibrator

A method for calibrating a logarithmic amplifier comprising the steps of:

• applying a swept frequency signal to an input of the logarithmic amplifier through a single pole resonator;
• determining from an output of the logarithmic amplifier a frequency response function for the single pole resonator in response to the swept frequency signal;
• applying a fixed frequency signal to an input of the single pole resonator;
• interrupting the fixed frequency signal at the input of the single pole resonator to allow the single pole resonator to ring down;
• determining from the output of the logarithmic amplifier a linear logarithmic response function in response to the ringdown of the single pole resonator;
• and
• calculating from the frequency response function and the linear logarithmic response function calibration parameters for the logarithmic amplifier.

A method for calibrating a logarithmic amplifier comprising the steps of:

• applying a swept frequency signal via a switch and a single pole resonator to the logarithmic amplifier to produce a swept output;
• digitzing and storing the swept output of the logarithmic amplifier as a frequency response for the single pole resonator;
• allowing the single pole resonator to ring down through the logarithmic amplifier after the single pole resonator has been charged by a fixed frequency signal, thus producing a ringdown output;
• digitizing and storing the ringdown output of the logarithmic amplifier as linear log response;
• and
• calculating from the frequency response and the linear log response calibration parameters for the logarithmic amplifier.