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A precise digital phase shifter using a phase-locked loop

A precise digital phase shifter using a phase-locked loop

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A phase-locked loop containing a voltage-controlled oscillator (v.c.o.) synchronised to a harmonic of its fundamental output frequency may be used to form an attractive digital phase shifter providing low phase error with relatively simple circuitry and control requirements. Phase increments of 2π/n radians are obtained, where n is the order of harmonic used.

References

    1. 1)
      • A.L. Cullen . New technique for digital phase shift control. Electron. Lett.
    2. 2)
      • Cullen, A.L., Davies, J.A., Williams, A.D.: `A precise injection locked i.f. phase shifting technique and its application to microwave ', Proceedings of the conference on precision electromagnetic measurements, 1976, Boulder, Colorado.
    3. 3)
      • A. Blanchard . (1976) , Phase-locked techniques, application to coherent receiver design.
    4. 4)
      • J. Austin , J.R. Forrest . (1977) Low cost steorable active array element design, Radar 77.
    5. 5)
      • A.H. Al-Ani , A.L. Cullen , J.R. Forrest . A phase locking method for beam steering in active array antennas. IEEE Trans. , 698 - 703
    6. 6)
      • A.L. Cullen , J.A. Davies . A new system for microwave Q-factor measurement. IEE J. Microwave Opt. & Acoust. , 3
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