Circuits and methods to achieve dynamic biasing for the complete loop
transfer function of a current mode voltage regulator have been achieved.
The circuit comprises a Mirror-Transconductor Amplifier type operational
transconductance amplifier (OTA) wherein its transconductance is linearly
dependent on its biasing current. This biasing current is a linearly
derivative of the OTA's output current. A current amplification circuit
couples the regulator output current linearly with said OTA's output
current. In this configuration the iterative biasing of the OTA forms a
feed-forward loop, which contains a low-pass filter for stability and a
negative feedback loop is closed by connecting the regulator voltage
output to the OTA input. The invention realizes a purely current mode
regulator since all internal currents are generated as a fraction of the
output load.