Design and simulation of an automatic control gain circuit for sensor systems
Keywords:
CMOS analog design, Automatic gain control, PWL predistortion.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.References
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