A phantom power supply increases the load on the output circuit of a condenser microphone and produces harmonic distortion. This effect can be cancelled by substituting two voltage-controlled current sources for the phantom power supply that reduce the load on the microphone output. This article presents measurements obtained with a single chip. The circuit is produced in an 80 V bipolar process. Distortion artefacts are reduced by up to 4 dB. A theoretical derivation for predicting the distortion of a phantom power circuit is given. Calculations based on the nonlinearity of transistors used in microphone output stages are compared with measurements and simulations.
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