Differential AGC with offset stability and wide range frequency synthesis

In modern electronic systems, signal stability is a crucial issue. Many methods have been developed to mitigate the deviation from an ideal signal. One of them is called Automatic Gain Control, which tracks variation in an input signal to settle output amplitude. This paper proposes a Differential Automatic Gain Controller with offset stability and frequency synthesis. It is a Proportional Integral Derivative controller that stabilizes the gain, offset and frequency simultaneously. The proposed model is simulated using spice, and the simulation shows that accurate results are obtained across wide frequency ranges for all three parameters. An arrangement with equivalent circuit models for passive components was also simulated, which provides a novel envelope detector design that operates at frequencies ranging from 1 MHz to 1 GHz.