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A 6 GHz Type-I fractional-N PLL with noise-cancelling DAC and discrete-time sample and hold loop-filter is presented. The 1 MHz bandwidth PLL utilizes an inherently linear PFD and noise-cancelling charge-pump DAC circuit to reduce quantization noise by more than 25 dB. The worst case near-integer in-band spur is measured at -61 dBc and the integrated RMS phase error is - 42 dBc. The measured in-band...
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