The circuit was meant to be powered by a power supply, which is why there is no transformer, rectifier, or filter capacitors on the schematic.
该电路是指由一个电源，这就是为什么没有变压器，整流器，或者过滤器供电电容的示意图。
The design eliminates the use of the large-valued filter capacitors you usually find in a switching regulator, because there is no need to smooth out high-frequency ripple in the LED current.
这种设计去除了通常在开关电源附近的大滤波电容，因为没有必要对LED电流的高频谐波进行平滑处理。
The filter needs only OTAs and grounded capacitors and is convenient for being realized by MOS technology.
这种滤波器只需要OTA器件和接地电容，适合于MOS技术集成。
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