New class of time-varying filters |
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| Authors: | Saraga W. |
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| Affiliation: | Associated Electrical Industries Ltd., Advanced Development Laboratories 2, Telecommunications Group, London, UK; |
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| Abstract: | ![]()
A new class of time-varying lowpass and highpass filters is described in which the stopband attenuation is obtained by outphasing in a quadrature-modulation arrangement, the undesired associated frequency translation or inversion being cancelled by a suitably chosen second step of quadrature demodulation or both; bandpass and bandstop filters can be obtained as combinations of lowpass and highpass filters. |
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