## Feedback analysis of transimpedance operational amplifier circuits

Publication: Research - peer-review › Journal article – Annual report year: 1993

### Standard

**Feedback analysis of transimpedance operational amplifier circuits.** / Bruun, Erik.

Publication: Research - peer-review › Journal article – Annual report year: 1993

### Harvard

*I E E E Transactions on Circuits and Systems Part 1: Regular Papers*, vol 40, no. 4, pp. 275-278., 10.1109/81.224302

### APA

*I E E E Transactions on Circuits and Systems Part 1: Regular Papers*,

*40*(4), 275-278. 10.1109/81.224302

### CBE

### MLA

*I E E E Transactions on Circuits and Systems Part 1: Regular Papers*. 1993, 40(4). 275-278. Available: 10.1109/81.224302

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### Author

### Bibtex

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### RIS

TY - JOUR

T1 - Feedback analysis of transimpedance operational amplifier circuits

AU - Bruun,Erik

PB - I E E E

N1 - Copyright: 1993 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE

PY - 1993

Y1 - 1993

N2 - The transimpedance or current feedback operational amplifier (CFB op-amp) is reviewed and compared to a conventional voltage mode op-amp using an analysis emphasizing the basic feedback characteristics of the circuit. With this approach the paradox of the constant bandwidth obtained from CFB op-amps is explained. It is demonstrated in a simple manner that the constant gain-bandwidth product of the conventional op-amp and the constant bandwidth of the CFB op-amp are both in accordance with basic feedback theory and that the differences between the traditional op-amp and the CFB op-amp are due to different ways of controlling the closed-loop gain. For the traditional op-amp the closed-loop gain is altered by altering the loop gain, whereas the closed-loop gain in a CFB op-amp configuration is altered by altering the input attenuation to the feedback loop while maintaining a constant-loop gain

AB - The transimpedance or current feedback operational amplifier (CFB op-amp) is reviewed and compared to a conventional voltage mode op-amp using an analysis emphasizing the basic feedback characteristics of the circuit. With this approach the paradox of the constant bandwidth obtained from CFB op-amps is explained. It is demonstrated in a simple manner that the constant gain-bandwidth product of the conventional op-amp and the constant bandwidth of the CFB op-amp are both in accordance with basic feedback theory and that the differences between the traditional op-amp and the CFB op-amp are due to different ways of controlling the closed-loop gain. For the traditional op-amp the closed-loop gain is altered by altering the loop gain, whereas the closed-loop gain in a CFB op-amp configuration is altered by altering the input attenuation to the feedback loop while maintaining a constant-loop gain

U2 - 10.1109/81.224302

DO - 10.1109/81.224302

JO - I E E E Transactions on Circuits and Systems Part 1: Regular Papers

JF - I E E E Transactions on Circuits and Systems Part 1: Regular Papers

SN - 1549-8328

IS - 4

VL - 40

SP - 275

EP - 278

ER -