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R(s) +, c(s), , he concept of transfer function will be discussed in later chapters. For the time being,, consider the transfer function of positive feedback control system is,, , T— via (Equation 1), , , , Where,, , ¢ Tis the transfer function or overall gain of positive feedback control system., , G is the open loop gain, which is function of frequency., H is the gain of feedback path, which is function of frequency., , Negative Feedback, , Negative feedback reduces the error between the reference input, R(s)R(s) and system, , output. The following figure shows the block diagram of the negative feedback control, system., , R(s) + C(s), , Transfer function of negative feedback control system is,, , G, ison (Equation 2)