The internal structure of a Sampling Phase Detector (SPD) may be understood as a high order impulse generador (IG) composed by a step recovery diode (SRD) that properly pumps a balanced mixer through coupling capacitors. Several IGs have been built prior to develop differenr topologies of harmonic phase detectors (HPDs) using a SRD. These systems that have also been simulated and tested have allowed to extract additional conclusions to [1]. The performances achieved with minimum microwave power led us to construct a sampled PLL with successful results.

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