High voltage amplifier using simplified circuit

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High voltage amplifier using simplified circuit [Copy link]

Many scientific instruments and sensors require AC high-voltage drivers. High-voltage drivers are suitable for driving electrodes in many application systems. The difficulty lies in boosting the output of ordinary operational amplifiers to very high voltages. Existing AC high-voltage amplifier modules can only amplify the output to about 1200V pp. This Design Idea proposes a simplified AC high-voltage amplifier using complementary cascaded NMOS and PMOS transistors (Figure 1). The OP07 op amp has low input offset voltage, low input bias current, and high open-loop gain. These characteristics make this op amp ideal for high-gain instrumentation systems. In addition, the offset and gain of the OP07 are extremely stable over time and temperature. The AC gain of the LM356 stage is determined by R3, R4, R7, and R9 and is approximately 100.