Mismatched Load Protected Solid State Amplifier of 1W CWRF Output in Frequency Range of 28 - 46 MHz

Abstract

This project work is associated with the concept, design, fabrication and testing of a continuous wave radio frequency (cwrf) solid state amplifier. This amplifier of gain more than 20dB with 10mW input, will be developed for general application in the frequency range of 28 to 46 MHz. This Low Power Amplifier (LPA) will be made to exhibit a feature of protection from finite mismatched load that causes Voltage Standing Wave Ratio (VSWR) and consequent failure of the solid state device. The rf and microwave circuits including amplifiers are designed for standard 50 transmission line components and load. In case of perfectly matched load, only incident waves exist without any reflection i.e. 1:1 VSWR and maximum power is transferred to the load. In practice, mismatched load persists where reflected waves along with the forward waves gives rise to standing waves that cause damage to the solid state devices due to various reasons. In order to protect the device, the amplifier to be developed, will be treated with various protections so that load mismatch is managed in the most optimised manner.
DOI: 10.17762/ijritcc2321-8169.150561