Quadrature-modulation-type lowpass and highpass filters
- 9 September 1971
- journal article
- Published by Institution of Engineering and Technology (IET) in Electronics Letters
- Vol. 7 (18) , 516-519
- https://doi.org/10.1049/el:19710350
Abstract
Quadrature-modulation filters, introduced by the author four years ago, can be realised in two different configurations. It is shown that, in the transition bands of the ‘star’-structured filters, ‘unwanted’ output frequency components (i.e. components not present at the input) are generated, but that, in ‘lattice-structured’ filters, semiequivalent to the corresponding star configuration, such unwanted components are (or can be) suppressed.Keywords
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