A high-speed phase-locked loop provides stable low-noise output signals from 33 to 4100 MHz with an external oscillator or its own internal source.
Model HMC835LP6GE from Hittite is a wideband fractional-N phase-lock-loop (PLL) source with integrated voltage-controlled oscillator (VCO) that provides continuous frequencies from 33 to 4100 MHz. It features PLL figure of merit for phase noise of -230 dBc/Hz in integer mode, -227 dBc/Hz in fractional mode, and typical VCO phase noise of -134 dBc/Hz offset 1 MHz from a 4-GHz carrier. Two separate charge-pump outputs allow seamless switching between integrated or external VCOs during operation. Suitable for scalable multiple-input, multiple-output (MIMO) and beam-forming applications, the PLL provides two differential output ports and delivers +7 dBm typical output power. It runs on +3.3- and +5.0-VDC supplies.