GENERATOR OF GAIN CONTROL SIGNAL TO TRACK CHANGE IN DC BIASING CAUSED BY CHANGE IN PREPARATION AND ACTION

摘要

PURPOSE: A generator of a gain control signal is provided to prevent a gain element and an output signal from influencing a partial DC biasing of a lighting circuit. CONSTITUTION: A gain controller includes the circuit of a reference signal generator and a signal converting circuit. The circuit of the reference signal generator is designed to receive a first bias signal to provide first and second reference signals. The change in the first bias signal is tracked corresponding to the change in the first and second reference signals. The signal converting circuit is connected to the circuit of the reference signal generator for providing first and second output control signals to receive the first and second reference signals. The first output control signal has the range corresponding to an input control signal having the minimum and maximum values. Also, the second output control signal has the range corresponding to an input control signal having the minimum and maximum values.