An Improved Wideband Amplifier for Piezoelectric Actuator

Piezoelectric actuators are becoming increasingly important in such fields as vibration control, precision positioning, acoustics and sonar, and it is mainly driven by voltage in practical application. The amplifier driven by voltage has good stability and static characteristic, but in high speed motion conditions, we have to sacrifice frequency response bandwidth to ensure stability, so its closed loop frequency response bandwidth is relatively low. This study aims at the default what we have discussed about the present piezoelectric amplifier designed a new type of piezoelectric amplifier which has a wideband. In this paper, feedback zero compensation and noise gain compensation with the intention of increasing frequency bandwidth are used in the multilevel amplifier and the test results of the performance of piezoelectric amplifier are described. This piezoelectric amplifier has a relatively strong load carrying ability, short response time, wideband and high stability by feedback zero compensation and noise gain compensation.