Abstract
In this paper, it is shown that by adding coupling to biquad pairs to obtain a fourth-order band-pass filter, the output thermal noise is reduced. It is shown analytically that minimum output thermal noise is obtained when the biquads are identical and the negative-feedback factor used for coupling is the same as for the minimum sensitivity to component tolerances and ambient changes. Furthermore, by optimizing the coupled biquads for maximum dynamic range, the output noise is further decreased.
| Original language | English |
|---|---|
| Pages (from-to) | 1713-1735 |
| Number of pages | 23 |
| Journal | International Journal of Circuit Theory and Applications |
| Volume | 47 |
| Issue number | 11 |
| DOIs | |
| State | Published - 1 Nov 2019 |
Bibliographical note
Publisher Copyright:© 2019 John Wiley & Sons, Ltd.
Funding
This work has been fully supported by Croatian Science Foundation under the project IP‐2016‐06‐1307 Fractional analog and mixed systems for signal processing. This work has been fully supported by Croatian Science Foundation under the project IP-2016-06-1307 Fractional analog and mixed systems for signal processing.
| Funders | Funder number |
|---|---|
| Hrvatska Zaklada za Znanost | IP-2016-06-1307 |
Keywords
- active filters
- analog circuits
- coupled biquads
- current-feedback operational amplifiers
- filtering theory
- output thermal noise
- second-generation current conveyors