Design and Evaluation of coarse tuned Feedback DAGC for Bluetooth Low Energy Receivers

In this work we are demonstrating a novel fast settling coarse gain tuned Intermediate Frequency (IF) digital feedback Automatic Gain Control (AGC) for Bluetooth Low Energy(BLE). Feedback architecture of AGC is designed to control the gain of 4 stage VGA by using digital control signals, with each of 15 dB gain factor. This ensures to prohibit the deviation of Analog signal through the Analog to Digital converter (ADC) from its efficient dynamic range. The proposed AGC has dynamic of 60 dB with an attack time of 52.94 ns. The AGC algorithm is validated by considering different attenuation factor on incoming signal. The Feedback AGC algorithm is simulated on MATLAB-Simulink Platform by incorporating channel impairments.