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Filter Design for RF Power Amplifiers
Published in Abdullah Eroglu, Introduction to RF Power Amplifier Design and Simulation, 2018
There are two main filter synthesis methods in the design of RF filters: image parameter method and insertion loss method. Although the design procedure with the image parameter method is straightforward, it is not possible to realize an arbitrary frequency response with the use of that method. The insertion loss method will be applied to design and implement the filters in this section. Filter design with the insertion loss method begins with complete filter specifications. Filter specifications are used to identify the prototype filter values, and prototype filter circuit is synthesized. Scaling and transformation of the prototype values are performed to have the final filter component values. The prototype element values of the LPF circuit are obtained using power loss ratio.
MF-UHF Filter Design Techniques
Published in Abdullah Eroglu, RF Circuit Design Techniques for MF-UHF Applications, 2017
There are mainly two filter synthesis methods in the design of RF filters: image parameter method and insertion loss method. Although the design procedure with the image parameter method is straightforward and easy, it is not possible to realize an arbitrary frequency response with the use of this method. We will be applying the insertion loss method to design and implement the filters in this section. The filter design with the insertion loss method begins with complete filter specifications as shown in Figure 6.2. Filter specifications are used to identify the prototype filter values and the prototype filter circuit is synthesized. Scaling and transformation of the prototype values are performed to have the final filter component values. The prototype element values of the LPF circuit are obtained using the power loss ratio.
A low complexity and high modularity design for continuously variable bandwidth digital filters
Published in International Journal of Electronics, 2023
Sushmitha Sajeevu, Sakthivel Vellaisamy
In frequency transformation-based methods (Oppenheim et al., 1976), a variable impulse response filter is obtained by applying frequency transformation on the Taylor expansion of the impulse response of the prototype filter. Cut-off frequency range of the variable bandwidth filter obtained through this method is very narrow. To improve the cut-off frequency range, frequency transformation techniques can be combined with coefficient decimation techniques (Darak et al., 2012). Variable bandwidth filters can be obtained through spectral Parameter Approximation (SPA) techniques (Dhabu & Vinod, 2017). The SPA technique was initially used for designing variable fractional delay filters but later adapted to design variable bandwidth filters. The bandwidth of the filter is varied in discrete steps through these approaches.
New design approach of three-dimensional IIR notch filter using all-pass sections
Published in Australian Journal of Electrical and Electronics Engineering, 2019
Ahmed Chinoun, Lahcène Mitiche, Amel Baha Houda Adamou-Mitiche
The authors in (Regalia and Mitra and Vaidyanathan, 1988) have developed an interesting design approach of a notch filter based on all-pass filter. The all-pass filter is implemented in a lattice structure, which has many desirable properties such as low round off noise compared to classic implementations and highly modular in structure (Kwan and Lui, 1989). Despite the advantages of this structure, the multidimensional polynomials cannot be factored, this means that a transfer function can generally not be manipulated into a form required by a particular implementation. This makes the design and implementation of 3-D filters more complex than the 1-D filters. This paper addresses the design problem of a 3-D IIR notch filter. The proposed filter is realised using two filters. The first one is an IIR filter based on all-pass filter which can be designed and implemented via lattice structure. It allows us to adjust the 3-dB rejection bandwidth of the notch filter with the lattice coefficient independently of the second filter design. The second one is a 3-D spatial straight line filter Bruton85 and it is designed to localise the notch frequency (Pei and Tseng, 1993). In addition, a 3-D analogue Prototype filter is designed using frequency transformation.
A Novel Hardware Efficient High Resolution Spectrum Hole Detection Technique for Cognitive Radio
Published in International Journal of Electronics, 2023
Sushmitha Sajeevu, Sakthivel Vellaisamy
is the total number of multipliers, is the multipliers of the prototype filter, is the multipliers for modulation and is the number of multipliers required for generating the high pass filter from low pass filter. Since DFT modulation is used, number of multipliers for modulation is