Sallen-Key polyphase filter design

Robens, Markus; Wunderlich, Ralf; Heinen, Stefan

doi:10.1109/icecs.2008.4674843

Cited by 3 publications

(3 citation statements)

References 5 publications

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“…In most applications, the differential structure will be preferred so that the inverters are not required. By using the superpostion principle with respect to φ i− and φ q− as well as the voltage divider law in its admittance form, the following sets of equations can be derived: The system theoretic model can also be developed in terms of equivalent circuits which is presented in [3]. By evaluation, the transfer function of the core circuit can be determined:…”

Section: B Core Circuitmentioning

confidence: 99%

Capacitive crosscoupling biquad polyphase filter

Robens

Wunderlich

Heinen

2009

2009 IEEE International Symposium on Circuits and Systems

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In this paper, the design of biquad polyphase filters with capacitive crosscouplings is presented. Based on the elementary equation s → s − j ωc, which describes the frequency shifting, system theoretic modeling is used for design. Some important observations simplifying the design process are denoted. The developed structures have been simulated in Cadence using operational amplifier models with adjustable gain and bandwidth. Results are compared to those of a Tow-Thomas polyphase filter with comparable sum capacitance but with an operational amplifier amount twice as high. By limiting the gain bandwidth product of the models to reasonable values it is shown that operational amplifier performance does not need to be improved and hence a reduced power consumption can be expected.

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Section: B Core Circuitmentioning

confidence: 99%

Capacitive crosscoupling biquad polyphase filter

Robens

Wunderlich

Heinen

2009

2009 IEEE International Symposium on Circuits and Systems

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“…Many polyphase biquad topologies presented in the literature are derived from real biquad structures, such as the Sallen-Key (SK) [1] and Tow-Thomas (TT) biquads [2], by using a pair of real biquads and transmittances between the I and Q paths, implemented by cross-coupled resistors.…”

Section: Comparative Analysis Of Four Filter Topologiesmentioning

confidence: 99%

“…A second order complex filter that uses only two differential OAs is the SK polyphase filter, presented in [1]; it is based on a modified version of the classical SK biquad.…”

Section: A Polyphase Filter Based On Sk Biquadmentioning

confidence: 99%

Comparative analysis of four second-order OA-RC polyphase filters for an ISM Low-IF receiver

Campanu

Salajan

Onet

2012

CAS 2012 (International Semiconductor Conference)

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This paper presents the comparative analysis of four implementation of a polyphase filter with the IF frequency of 1MHz and the passband width of 700 kHz. All versions employ the OA-RC technique but have different topologies: the classical structure based on lossy integrators, then two structures derived from the well-known Tow-Thomas and Sallen-Key real biquads and a novel topology, based on the Rauch structure. First, the requirements for the active cell-the OA-are derived by analysing the effects the OA finite gain-bandwidth product and (possible large) output resistance has on the filter performance for each topology; then an OA that meets the requirements is designed in a standard 0.18um CMOS process, optimized for low power consumption. The extensive set of simulation results presented here allows a detailed comparison between the four designs, targeting same specifications.

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Optimization methods and circuit topologies for low-power analog filters

Neag

2013

CAS 2013 (International Semiconductor Conference)

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Sallen-Key polyphase filter design

Cited by 3 publications

References 5 publications

Capacitive crosscoupling biquad polyphase filter

Capacitive crosscoupling biquad polyphase filter

Comparative analysis of four second-order OA-RC polyphase filters for an ISM Low-IF receiver

Optimization methods and circuit topologies for low-power analog filters

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