## 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

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

### APA

*IEEE Transactions on Circuits And Systems Part I: Regular Papers*,

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

### CBE

### MLA

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

### Vancouver

### Author

### Bibtex

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### RIS

TY - JOUR

T1 - Feedback analysis of transimpedance operational amplifier circuits

A1 - Bruun,Erik

AU - Bruun,Erik

PB - IEEE Circuits and Systems Society

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 - IEEE Transactions on Circuits And Systems Part I: Regular Papers

JF - IEEE Transactions on Circuits And Systems Part I: Regular Papers

SN - 1057-7122

IS - 4

VL - 40

SP - 275

EP - 278

ER -