analog filters using matlab [electronic resource]

[...]... for Analog Filters 309 Index 311 11 Note to Instructors The solutions manual for the book can be found on the author’s webpage at http://www.es.isy.liu.se/publications/books /Analog Filters Using MATLAB/ Supplementary information can also be found on the author’s webpage xv Chapter 1 Introduction to Analog Filters. .. among other things, as antialiasing filters; see Section 1.4.2, when sampling analog signals Such filters are an essential part in interfaces between analog and digital systems, e.g., in GSM phones between the microphone and the A/D converter Analog filters are also used to filter the output signal of D/A converters An example of time-variable filters are adaptive filters, which normally operate on... Because the filters in these high-volume applications are often battery powered, the cost and the power consumption are of major concern of the most important analog filter technologies and their typical usable frequency ranges are: Mechanical Filters Crystal filters Quartz – monolithic Quartz – non-monolithic Ceramic filters Metal resonator filters Surface acoustic wave filters Bulk acoustic wave filters. .. Introduction to Analog Filters 1.4 Examples of Applications Spectrum In this section, we will briefly describe some typical applications of analog filters Here we will only discuss filtering of signals and not, e.g., filters for attenuation of harmonics in an AC/DC converter Such filters for filtering large currents and voltages are also used in the electric power grid Historically, filters for use... few hundred MHz Analog filters have their advantages in applications with less demands on the dynamic signal range and for higher frequencies Of course, discrete-time and continuous-time filters are not direct competitors as they are more suitable in their own environments 12 1 Introduction to Analog Filters both the value of H( jo) and the phase F(o) H( jo) can be written as 1.7 Analog Filters In this... Controllable active integrated analog filters have during the 1990s, due to the large economic significance, been a driving force behind the development 10 1 Introduction to Analog Filters of integrated active filter technology Other important applications that are the driving force behind technology development are anti-aliasing filters that are used in front of the A/D converters and filters to attenuate spurious... they store, transmit, or reduce the information The concept ‘‘information’’ has a strict scientific definition, but we will L Wanhammar, Analog Filters Using MATLAB, DOI 10.1007/978-0-387-92767-1_1, Ó Springer ScienceþBusiness Media, LLC 2009 1 2 1 Introduction to Analog Filters Modem A Computer A Channel Modem B Filter 980 Computer B Comparison 0 Osc 1 0 1 1 .01011 .01011 1180 Filter Fig 1.1 Computer-to-computer... Operational amplifier-based active filters were easier to design, especially for low 9 (audio) frequencies, and it therefore became the dominant technology The usable frequency range was, however, limited to a few MHz Nowadays, active filters can be implemented with bandwidths of several hundreds of MHz 1.5.3 Integrated Analog Filters The event of integrated analog filters makes integration of a complete... highpass filters with narrow transition bands together with bandpass and bandstop filters with narrow passbands and stopbands, respectively, are more difficult and more costly to 1.7 Analog Filters 15 implement The cost for realizing the filters increases with decreasing transition band Figure 1.19 shows the magnitude function and the phase function for an allpass (AP) filter Characteristic of allpass filters. .. on the development of both filter theory and different types of filter technologies Some of these filters must meet very strict requirements Nowadays different types of analog filters in, e.g., cellular phones and hard drives are important applications that push the development forward as these analog filters are manufactured in great numbers annually 1.4.1 Carrier Frequency Systems In older parts .