PUSH_PULL_RF

Published:2009/7/16 7:06:00 Author:Jessie | From:SeekIC

Uses VHF power transistors to obtain wide dynamic range. Transformers are trifilar wound on Indiana General F625-9-T09 toroid cores. Circuit has extremely low VSWR at both input and output, along with low noise figure. Second-order intermodulation products can be suppressed nearly 40 dB over single stage. Either RCA 2N5109 or Amperex BFR95 transistors can be used. Gain is about 11 dB.Current feedback is used through unbypassed 6.8-ohm emitter resistor, voltage feedback through unbypassed 330-ohm base-to-collector resistor, and transformer feedback through third winding on wideband transformer to stabilize input and output impedances.-U. L.Rohde, High Dynamic Range Receiver Input Stages, Ham Radio, Oct. 1975, p 26-31.



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