Artículo
An Op-Amp Approach for Bandpass VGAs With Constant Bandwidth
Autor/es | Pourashraf, Shirin
Ramírez Angulo, Jaime López Martín, Antonio J. González Carvajal, Ramón Algueta Miguel, José María |
Departamento | Universidad de Sevilla. Departamento de Ingeniería Electrónica |
Fecha de publicación | 2018 |
Fecha de depósito | 2023-01-19 |
Publicado en |
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Resumen | Two approaches to implement variable gain amplifiers based on Miller op-amps are discussed. One has true constant bandwidth while the other has essentially reduced bandwidth variations with varying gain. Servo-loops and ... Two approaches to implement variable gain amplifiers based on Miller op-amps are discussed. One has true constant bandwidth while the other has essentially reduced bandwidth variations with varying gain. Servo-loops and ac coupling techniques with quasi floating gate transistors are used to provide a bandpass response with very low cutoff frequency in the range of hertz. In practice, one of the schemes is shown to have bandwidth variations close to a factor two while the second one has true constant bandwidth over the gain tuning range. Experimental results of test chip prototypes in 180-nm CMOS technology verify the theoretical claims. |
Cita | Pourashraf, S., Ramírez Angulo, J., López Martín, A.J., González Carvajal, R. y Algueta Miguel, J.M. (2018). An Op-Amp Approach for Bandpass VGAs With Constant Bandwidth. IEEE Transactions on Circuits and Systems. Part 2: Express Briefs, 65 (9), 1144-1148. https://doi.org/10.1109/TCSII.2018.2808236. |
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