Low-power, low-noise, active-RC band-pass filters using a ‘lossy’ LP-BP transformation
| Autor: | George S. Moschytz, Neven Mijat, Drazen Jurisic |
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| Rok vydání: | 2011 |
| Předmět: |
Engineering
business.industry Applied Mathematics Low-pass filter Electronic filter topology low-power low-sensitivity active-RC filters discrete-component active-RC filters lossy LP-BP transformation RC-RC network transformation analog filters Computer Science Applications Electronic Optical and Magnetic Materials Filter design Control theory Electronic engineering Prototype filter Electrical and Electronic Engineering Network synthesis filters business High-pass filter Active filter m-derived filter |
| Zdroj: | International Journal of Circuit Theory and Applications. |
| ISSN: | 0098-9886 |
| DOI: | 10.1002/cta.782 |
| Popis: | A new and straightforward design procedure for simple canonical topologies of allpole, active-RC, low-selectivity band-pass (BP) filters, with low sensitivity to component tolerances is presented. The procedure is primarily intended for discrete-component, low-power filter applications using just one amplifier for relatively high-order filters. The design procedure starts out with an 'optimized' low-pass (LP) prototype filter, yielding an 'optimized' BP filter, whereby the wealth of 'optimized' single-amplifier LP filter designs can be exploited. Using a so-called 'lossy' LP–BP transformation, closed-form design equations for the design of second- to eighth-order, single-amplifier BP filters are presented. The low sensitivity, low power consumption, and low noise features of the resulting circuits, as well as the influence of the finite gain-bandwidth product and component spread, are demonstrated for the case of a fourth-order filter example. The optimized single-opamp fourth-order filter is compared with other designs, such as the cascade of optimized Biquads. Using PSpice with a TL081 opamp model, the filter performance is simulated and the results compared and verified with measurements of a discrete-component breadboard filter using 1% resistors, 1% capacitors, and a TL081 opamp. |
| Databáze: | OpenAIRE |
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