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Controlled wide-range quadrature phase-shift network

Controlled wide-range quadrature phase-shift network

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A system is described which produces a 90° phase shift for a wide range of single-frequency input signals. Thus, whilst it will not handle wideband input signals, it may be useful for such applications as N-path and quadrature modulation filters where the provision of variable-frequency quadrature carrier signals allows the position of the passband to be continuously altered. In practice the phase shift through the system can be maintained at 90° ±0.15° for a 10: 1 range of signal frequencies.

Inspec keywords: phase shifters

Subjects: Other analogue circuits

References

    1. 1)
      • A. Bilotti . Operation of an m.o.s. transistor as a variable resistor. Proc. Inst. Elect. Electron. Engrs. , 1093 - 1094
    2. 2)
      • Mcdonald, A.: `M.O.S. integrated attenuators', 17, Marconi-Elliott Microelectronics application report, .
http://iet.metastore.ingenta.com/content/journals/10.1049/el_19690440
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