Novel phase meter using narrow pulse switched capacitor phase shifter

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Novel phase meter using narrow pulse switched capacitor phase shifter

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© The Institution of Electrical Engineers
Published

A novel phase meter with a switched capacitor phase shifter (SCPS) is described. This phase meter is a nonlinear feedback device and relies on the phase compensation principle. This works satisfactorily phase range –π/2 < π < + π/2 under signal to noise ratios as low as –10dB and DC offsets as high as the input signal-plus-noise peak in the signal channel. The influence of noise on the output phase noise is studied. Its steady state error curve is presented for two representative noise levels.

Inspec keywords: switched capacitor networks; phase meters; phase shifters

Other keywords: output phase noise; DC offsets; nonlinear feedback device; noise influence; phase range; phase compensation principle; phase meter; narrow pulse; noise levels; noisy signals; circuit diagram; -10 dB; steady state error curve; switched capacitor phase shifter; signal to noise ratios

Subjects: Active filters and other active networks; Phase and gain measurement; Display, recording and indicating instruments; Other analogue circuits

References

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      • E.W. Taw , V.G.K. Murti . Unity-gain frequency-independent quadrature phase shifter. Electron. Lett. , 10 , 431 - 432
    2. 2)
      • C.A. Karybakas , G.A. Michoutsis . A circuit for constant phase shift using a narrow pulse duty cycle all-pass filter. IEEE Trans. , 4 , 594 - 598
    3. 3)
      • J. Siuzdak . Noise-proof phase meter with switched lowpass filters. Electron. Lett. , 14 , 591 - 592
    4. 4)
      • J. Siuzdak . Compensative phase meter with lock-in detection. IEE Proc. G , 5 , 189 - 192
    5. 5)
      • H.O. Modi , V. Jagadeesh Kumar , P. Sankaran . Feedback compensated synchronous and multiplier type phase sensitive detectors. IEEE Trans. , 3 , 646 - 649
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