900_MHz_gain_controlled_amplifier

Published:2009/7/23 22:24:00 Author:Jessie | From:SeekIC

This circuit shows an SL2365 transistor array connected as a gain-controlled amplifier. The transistor-array connections are shown in Fig. 2-35B.The collector load of TR1 is a transformer that is composed of a 14-mm length of 75-Ω stripline resonated with a 1- to 6-pF variable capacitor. The transformer secondary is a small loop of stiff wire that is grounded at one end and located a few mm above the stripline. The noise figure at full gain is 9 dB.



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