TIDA-00347, Low Frequency RF Amplifier Reference Design. Wideband RF amplifiers require external coupling capacitors and an RF choke to supply bias to the output transistor collector. As the frequency of operation is reduced, the choice of these components must be modified to maintain proper gain and linearity in the device. This design provides the circuit modification recommendations for operating a wideband RF amplifier device like the TRF37B73. A full complement of testing over temperature and voltage is provided for intermediate frequencies (20 to 400 MHz) to illustrate the effectiveness of the design