Fasedetektor
(c) I, Arnero, CC BY-SA 3.0
En fasedetektor, fasediskriminator eller fasekomparator er en blander, analog multiplikator eller logik kredsløb, som genererer et spændingssignal som output, der repræsenterer forskellen i fase mellem to signal input.
Detektering af faseforskelle er meget vigtig i mange anvendelser, såsom motorstyring, radar og telekommunikation systemer, servomekanisme og demodulatorer. Fasedetektoren er et kritiskt element i en faselåst kredsløb (PLL).
Se også
- Bærebølgerestorering
- Differentialforstærker
Kilder/referencer
- Crawford, James A. (1994), Frequency Synthesizer Design Handbook, Artech House, ISBN 0-89006-440-7
- Wolaver, Dan H. (1991), Phase-Locked Loop Circuit Design, Prentice Hall, ISBN 0-13-662743-9
Yderligere læsning
- Egan, William F. (2000), Frequency Synthesis by Phase-lock (2nd udgave), John Wiley & Sons, ISBN 0-471-32104-4
Eksterne henvisninger
- Chapter 8 Modulators and Demodulators Arkiveret 13. september 2007 hos Wayback Machine
- Phase-Lock Loop Applications Using the MAX9382 Arkiveret 8. februar 2009 hos Wayback Machine
Medier brugt på denne side
Phase detectors.svg
(c) I, Arnero, CC BY-SA 3.0
Signal goes from left to right. Right is a filter circuit. In the middle is the charge pump. Left are three phase detectors. From top to bottom: The Gilbert cell works for sine waves, square waves, and less well for pulses. On square waves it acts as an XOR gate, which can also be composed of NANDs. Adding feedback and removing one NAND gives the time frequency detector. The delay prevents the dead band.
(c) I, Arnero, CC BY-SA 3.0
Signal goes from left to right. Right is a filter circuit. In the middle is the charge pump. Left are three phase detectors. From top to bottom: The Gilbert cell works for sine waves, square waves, and less well for pulses. On square waves it acts as an XOR gate, which can also be composed of NANDs. Adding feedback and removing one NAND gives the time frequency detector. The delay prevents the dead band.