Time based gain control for the analog to pulse converter
This study presents an approach for time based automatic gain control (TGC) for the analog to pulse converter (APC). APC converts the area under analog signal into a sequence of pulses, with the spacing between pulses corresponding to the time taken to accumulate a fixed area. In this paper, we demonstrate that the gain of signal amplifier can be automatically controlled using the information in the time between pulses; thereby, ensuring the pulse density of APC remains within desired range despite fluctuations in the input. The performance of the TGC is quantified in terms of settling time and error bounds. We study the proposed system theoretically and show that its response is equivalent to conventional AGCs. Moreover, it is tested on physiological signals corrupted by a fading profile and the results demonstrate the effectiveness of the proposed system.