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Multi-Level Balanced Isolated Floating Difference Amplifier

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3 Author(s)
Yung-Cheng Tung ; Dept. of Mech. Eng., Nat. Chiao-Tung Univ., Hsinchu ; Shyr-Long Jeng ; Wei-Hua Chieng

An innovative amplifier is proposed for applications involving high capacitive load and large voltage output swing, such as piezoelectric (PZT) actuator drivers. This amplifier is configured in a multi-level arrangement with floating amplifiers, yielding a high voltage gain as a sum of all individual gains from its operational amplifiers. The merits of such an amplifier also include a wide bandwidth and high potential power. Experiments using a six-level arrangement demonstrate a 100 kHz bandwidth with plusmn200 V output swing for different capacitive loadings.

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IEEE Transactions on Circuits and Systems I: Regular Papers  (Volume:55 ,  Issue: 10 )