Simple_RF_leveling_loop

Published:2009/7/23 22:19:00 Author:Jessie | From:SeekIC

This circuit stabilizes the amplitude of an RF signal against variations in input, time, and temperature. A1 (an OTA, chapter 11) feeds current-feedback amplifier A2. The A2 output is sampled by the A3-biased gain-control configura-tion. The 4-pF capacitor compensates rectifier diode capacitance, which enhances output flatness versus frequency. The A1 ISET input current controls A1 gain, and allows overall output-level control.



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