Broadband 300 MHz IF Amplifier Design

The incentive for this work arises from the need for IF amplifiers in short hop radio systems. Such systems may be powered by thermoelectric generators driven by propane gas and have the electronic repeater mounted at the top of a pole. Amplifiers used for this application must: (i) Be sufficiently broadband to amplify, with low distortion, large index analog FM or PSK-PCM signals. (ii) Have good temperature stability since they operate at outdoor ambient temperatures. {Hi) Be small and lightweight to fit into the limited space of the pole mounted enclosure and to keep the weight loading at the top of the mounting to a minimum. (iv) Have low power consumption to operate from a thermoelectric generator which is the primary power source. (v) Be designed, if possible, with a thought toward the use of integrated circuitry for future amplifiers. In the amplifier designed to satisfy these requirements, most of the gain is obtained in broadband common emitter stages. Transistors with a low current gain are used so that the interstage is simple, 1665