![]() The wide-band filters are designed for two different systems the first system is designed for 20 MHz modulated band width and the second is designed for 2 MHz modulated band width. ![]() The IS-54 filter is a a twelfth order narrow band filter with 20 kHz band width and a center frequency of 95 kHz. Several clock generators can, therefore, be used on the same die.Īll work presented in this thesis is fabricated and tested in a standard 5 volt CMOS processes. The clock is local and occupies only a small area. The generator is a digital alternative to analog on-chip generators as for instance PLL's. It is a counter based clock generator i.e the counter stops a ring oscillator after the correct number of cycles has been generated. The clock generator is developed to increase the throughput in bit-serial designs such as the intermediate and the wide band filters above. Both the narrow band and the wide band filters use a wave digital lattice structure realized with bit-serial arithmetic. The digital base band filters are designed for use in some wide band research systems. It is a narrow band filter designed for the American digital mobile telephone system according to the IS-54 specification. The intermediate frequency filter is a digital alternative to today's analog filters. Second, a local clock for on-chip clock generation is introduced. ![]() ![]() First, digital filters for both intermediate and base band filtering for mobile communication are presented. This thesis presents two prime contributions. ![]()
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