Design and simulation of an automatic control gain circuit for sensor systems
Vol. 25 No. 1 (2012), Research Papers
Vol. 25 No. 1 (2012)

Design and simulation of an automatic control gain circuit for sensor systems

Research Papers
Published 2012-03-15
D. Moro Frías
Instituto Nacional de Astrofísica, Óptica y Electrónica
M. T. Sanz Pascual
Instituto Nacional de Astrofísica, Óptica y Electrónica
A. Díaz Sánchez
Instituto Nacional de Astrofísica, Óptica y Electrónica
C. A. de la Cruz Blas
Universidad Pública de Navarra, Campus de Arrosadía
B. Calvo
Grupo de Diseño Electrónico (I3A), Universidad de Zaragoza
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Keywords

CMOS analog design
Automatic gain control
PWL predistortion. Diseño analógico CMOS
Control automático de ganancia
Predistorsión PWL.

How to Cite

Moro Frías, D., Sanz Pascual, M. T., Díaz Sánchez, A., de la Cruz Blas, C. A., & Calvo, B. (2012). Design and simulation of an automatic control gain circuit for sensor systems. Superficies Y Vacío, 25(1), 36-42. Retrieved from https://superficiesyvacio.smctsm.org.mx/index.php/SyV/article/view/226
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Abstract

The role of an Automatic Gain Control (AGC) circuit is to provide relatively constant output amplitude regardless of the signal variations at its input. For this reason, AGC circuits reduce the required input dynamic range of subsequent conditioning circuits for resonant sensors, where information is frequency modulated. An AGC circuit in a 0.35µm and biased with VDD=3V is presented in this paper, to be used in sensor systems operating from DC to 100kHz. The Variable Gain Amplifier is based on a novel technique which uses a pre-distortion piecewise-linear block to exponentially vary the gain. The total harmonic distortion is lower than -54dB and the power consumption of the whole system is 12.4mW. The results were obtained by HSpice simulations.

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