Published:2011/6/1 22:31:00 Author:leo | Keyword: The circuit diagram of preamplifier serving the electric motor drive circuit, MC1437 | From:SeekIC
Picture 1 shows a preamplifier that serves the electric motor drive circuit. In this circuit, 90° phase shift adopts differential coefficient circuit with operational amplifier MC1437 (1). It is connected to in-phase amplifier MC1437 (2) with the voltage plus of 40 dB. Feedback resistance R1 and input capacitance C1 can make up of differential circuit. R3 and R4 are used to set DC operating point of operational amplifier. And the operating point is set in the 1/2 of the voltage of power supply. The gain of differential circuit increases by the frequency. Therefore, the circuit may develop into high-frequency section and it needs to limit bandwidth. The single-ended output of MC1437 (2) passes VT1 and becomes two ways signals in order to drive sh-pull (PP) output amplifier.
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