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This paper studies the cascade synthesis of RC polyphase one-ports. We discuss it based on LC polyphase networks instead of RC ones, and give sufficient conditions for a positive real function to be realizable as a one-port.
This paper presents a two-channel Hybrid Filter Bank (HFB) Analog-to-Digital Converter (ADC) that targets broadband digitization, for Cognitive Radio (CR) applications. The proposed architecture partitioning uses low-cost third order Butterworth analog filters and fourth order digital IIR filters. The optimization algorithm combines direct simplex search, minimax methods and a perturbation strategy...
This paper derives ƒs/2 modulation from signal and system theory of complex signals. It is presented, how the In phase and the Quadrature phase are reduced to a single phase, while all properties of complex signaling are maintained. Further, it is derived, that the remaining phase is predestinated for ΣΔ modulation. Finally, simulation results prove the theoretically derived offset-elimination property.
In this work an analytical design method for two types of 2D recursive filters is proposed. The design starts from a given analog prototype filter with specified parameters and a transfer function which is factorized into elementary (biquad) functions. Applying adequate frequency transformations to these functions, the desired 2D filters are directly obtained in a factorized form, preserving the selectivity...
Conditions for the existence of positive stable realizations with system Metzler matrices for proper transfer function are established. A method based on the decomposition of transfer functions into the first, second and third orders transfer functions for computation of positive stable realizations is proposed. A method for computation of positive stable realizations of transfer functions with real...
The concept of high-order ramp analog-to-digital converter and its design aiming at medium-high resolution (12–14 bits) are presented. Design methods that give rise to various Nyquist rate schemes resembling incremental converters are described. Since for Nyquist rate achieving noise shaping is not the goal, the design care is just maintaining good stability to avoid performance degradation. Different...
The aim of this paper is to describe a method of filter bank realization using the switched capacitor (SC) technique. The analysis of steps needed for this realization is performed. The correct solution requires the IIR filter bank synthesis followed by the conversion to SC circuits. Due to simplicity only the two-channel filter bank is used. The main points of the whole design procedure and key recommendations...
This article presents the optimization process for a new architecture of digital-enhanced radio frequency receiver. This receiver is based on combining charge sampling filters and hybrid filter banks techniques. We describe the structure optimization based on a compromise between performance and implementation constraints. We then show the performances evaluation in system-level and electrical level...
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