µC-based circuit performs frequency multiplication

Posted on Apr 23, 2012    7175

The traditional frequency multiplier requires many elements: a phase comparator to detect the phase error between the input and the output signals, a lowpass filter to convert the phase error to a dc control signal, a VCO to generate the output, and a divider to set up the multiple ratio. The circuit in Figure 1 uses a different approach to multiply frequency with a programmable multiple ratio from 1 to 7 (Table 1).

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