Microwave high power amplifier (HPA) is a main device of wireless systems at the transmitter. It is responsible to increase the power level of the input signal up to certain level necessary for the transmission purposes at higher frequencies. Most of the amplifiers having the property of attenuating and distorting the signals that are required to increase the power level of the input signal. Many new methods have been proposed in recent years to achieve different levels of linearity and efficiency but the drawback was complex circuitry and trade-off between gain and bandwidth. The new technique called negative impedance compensation is introduced in this research for enhancing the linearity and power efficiency of the power amplifier without compromising gain and bandwidth. Feedback amplifier is introduced with main amplifier and the negative impedance is added to the input terminals of the main amplifier and it is analysed by using volterra model. Feedback amplifier and main amplifier is having same structure; hence the complexity of the circuit is reduced. Negative impedance is added to cancel harmonic and intermodulation distortion. Linearity is measured by plotting gain v/s frequency with and without feedback amplifier. Harmonic and intermodulation distortion is measured with and without feedback amplifier. I. INTRODUCTION Microwave high power amplifier (HPA) is a main device of wireless systems at the transmitter. It is responsible to increase the power level of the input signal up to certain level necessary for the transmission purposes at higher frequencies. Linearity, stability and power efficiency of microwave HPAs are the three main parameters taken into consideration for designing the high power amplifier. (1) Most of the amplifiers having the property of attenuating and distorting the signals that are required to increase the power level of the input signal. The presence of distortion is caused by the non-linearity of the amplifiers. The harmonic contents and the intermodulation products of output signal give measure of the level of non-linearity. (2) The quick and high development in wireless technology has put an eminent utilization of various balances methods for example, OFDM, CDMA and QAM and so on. These methods require high linearity regarding spectral leakage and intermodulation distortion (IMD). Some new techniques have been accounted for as of late to accomplish distinctive levels of linearity by utilizing special pre-distortion, remunerating pre-post-twisting impact or consonant/intermodulation injection. These techniques concentrate on diminishing the bending at the source end, making them more efficient than the conventional linearization procedures. Be that as it may, most existing procedures typically require complex hardware, which is not reasonable for practical realization. Moreover, a few strategies may corrupt the level of linearity and efficiency when working at high working frequencies. (3) A novel high linear amplifier technique based on the negative impedance compensation is connected to a useful circuit outline that can be used for current RF CMOS technology. (4) By utilizing the Volterra model, the particular feedback structure of the proposed linearization technique will enhance the gain and linearity moreover bandwidth also. This method is required to remove the constraints of some conventional strategies in which the linearity is enhanced by exchanging off the gain and bandwidth. (5)