| 摘要 |
The invention relates to a device for raising the level of an analog voltage. In the invention, the pulse frequency or pulse width of a pulse signal coupled through a transformer (T1) of a high-frequency chopper circuit is modulated by the amplitude of a low-frequency analog alternating voltage signal (Vin). The intermediate tap (12) of the secondary winding (M2) of the transformer is connected through a coil (L1) to the output of the device. A negative (D5), and, respectively, a positive (D4) rectifying element is connected to the ends of the secondary winding (M2). One of the rectifying elements is switched on in the positive half cycle of the analog input signal, and the other in the negative half cycle. As a result the waveform of an analog voltage provided at the output of the device follows the waveform of the analog input signal, the peak-to-peak amplitude of the output signal being approximately equal to the voltage amplitude across the secondary coil. The signal distortion can be reduced by feed-back.
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