Patent ID: 7746126

Claim:
A load drive circuit comprising: an output terminal to which a load should be connected; an input terminal to which an input signal should be given; a final amplifier including an output element for driving the load; a preamplifier for driving the output element included in the final amplifier according to the input signal; and a phase compensator for improving a phase characteristic between input and output signal waveforms, an output signal of a non-inverting form appearing in the output terminal according to the input signal given to the input terminal, characterized in that the phase compensator is constituted by inserting series circuits of nonlinear resistive elements and switch elements between a control input terminal of the output element of the final amplifier and the output terminal of the load drive circuit, the nonlinear resistive element has a nonlinear characteristic in which a resistance value decreases as an applied voltage value increases and the resistance value increases as the applied voltage value decreases, and the switch elements are switching-controlled to selectively come into an ON state only in a high-electric potential period or a low-electric potential period of the input signal according to whether the output element is arranged on a high-electric potential side or a low-electric potential side in the final amplifier.