High frequency synthesis and duty cycle control with interpolative dividers using a low speed interface
Abstract:
An interpolative divider includes a look ahead sigma delta modulator circuit to generate divide values according to a divide ratio. A plurality of M storage elements are coupled to the sigma delta modulator to store the divide values, M being at least 2. A selector circuit selects the respective divide values and supplies the divide values to a portion of an interpolative divider circuit, the portion including a divider and a phase interpolator. The interpolative divider generates an output clock signal having a first clock period that may be determined by the first and second divide values. The M storage elements are loaded by a clock signal that is slower than the output clock signal by at least half.
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