EDN

Phase/frequency detectors

Two ECL three-state phase/frequency detectors have been designed to be used in PLLs, clock management, and various broadband communication signal synchronization applications. Packaged in a 20-pin ...
EDN

Frequency and phase locked loops

The purpose of a phase locked loop (PLL) is to generate a frequency and phase-locked output oscillation signal. To achieve this goal, prior art essentially functioned ...
Design-Reuse

Phase-frequency detector in ECL logic

The phase-frequency detector (PFD) consists of 2 D-trigger with reset from external circuit, performed in ECL logic and multiplexer, which allow to sw ...
Design-Reuse

PLL CMOS phase-frequency detector with CMOS charge pump

Phase-frequency detector (PFD) forms control signal for VCO tuning. PFD compares phases of divided VCO signal and divided reference oscillator signal ...
Electronic Design

PLL Synthesizer Offers High Output Frequency And Lowest Phase Noise

The Texas Instruments LMX2581 phase-locked loop (PLL) frequency synthesizer integrates a voltage-controlled oscillator (VCO) that covers from 50 to 3760 MHz and offers perhaps the best phase-noise ...