Two-stage amplification, the first stage is the voltage amplification made by the OPA445 chip, and the second stage is the power amplification made by the OPA541. The power amplification circuit is mainly used to provide a large enough voltage and current signal to the phase load. The power amplifier will add a power tube with a larger operating current at the end of the voltage amplification, so that it can not only connect a load with a large impedance, but also a load with a smaller impedance. In this way, the output current will increase due to the reduction of load impedance, while the voltage can remain unchanged, and the power will become larger.
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