The paper presents a new optimized implementation of IIR biquad filtration routine for highperformance 16-bit fixed point Blackfin DSPs. The core of hand-optimized routine uses both MAC units available in Blackfin architectures and in contrary to other available solutions it does not produce pipeline stalls in the DSP control and MAC units. The proposed core is the fastest currently available I...

Unified Active Filter Biquad Structures Chun-Ming Chang, Bashir M. Al-Hashimi, and J. Neil Ross Electronics Systems Design Group Department of Electronics and Computer Science, University of Southampton, Highfield, Southampton SO17 1BJ, UK E-Mail:cmc01r@ecs.soton.ac.uk Abstract: This paper presents one new biquad filter model based on nullators, norators, current mirrors and passive R (resistor...

This paper presents an optimum tuning procedure for high-order low-pass (LP) elliptic filters. Since elliptic filters are often used to satisfy very tight specifications, they often need to be tuned accurately. In this paper, we describe the tuning of one biquad, the 'tuning biquad', in a cascade of biquads. It is shown by Matlab simulations that the best choice for the tuning biquad consists o...

Abstract – A voltage-mode (VM), multi-input single-output (MISO) type multifunction biquad is proposed. It uses only one operational transresistance amplifier (OTRA) as the active element, while previously reported VM multifunction filters require more OTRAs. Proposed MISO type biquad configuration can realize all five different filter transfer functions. Theoretical results are verified with P...

Transformation of different types of switched-capacitor (SC) biquad filter stages based on FleischerLaker biquad SC structure in order to support oscillation based testing (OBT) have been proposed. The derived solutions are based on the generic Fleischer-Laker biquad SC structure assuming ideal characteristics of the employed components. In this paper, we explore the operation of the proposed O...

A low noise 6th-order elliptic low-pass filter is proposed and implemented. For the high level integration of multi-standard wireless terminal at low cost, the direct conversion architecture is favored for the RF transceiver, and a low noise channel selection filter with enough out-of-band suppression takes a critical role for the direct conversion receiver. For the noise optimized filter desig...

This paper presents a new filter structure based on only single voltage differencing transconductance amplifier (VDTA) and three grounded passive elements and has capability to low pass (LP), band pass (BP), high pass (HP), band reject (BR) and all pass (AP) biquad filtering functions at an explicit current output by the use of appropriate selection of three current input signals. Hence, it is ...

A SIMO (single input and multiple outputs) universal mixed-mode (including voltage, current, transadmittance, and transimpedance modes) biquad with one input (a single voltage or current input) and eight outputs (five voltage outputs and three current outputs simultaneously) by using three differential difference current conveyors (DDCCs), four resistors, and two grounded capacitors, is present...

Often some noise signals get interleaved with speech signals and owing to noisy surroundings the captured signal may not sound as desired. For such cases, a combination of Hilbert transform filter and Biquad filter in cascaded form might prove helpful. An arrangement in a simulink model demonstrates successful noise reduction in a voice signal recorded from a microphone. Both the filters used w...

A family of gm −C biquad structures is derived. These biquads require only a pair of grounded capacitors and three transconductors. It is shown that a pair of complex zeros can be realized simply by replicating the output stage of the transconductance block, thereby constructing a second output current that is proportional to the original output current. Although these biquad structures are ver...