VHF_VARACTOR_TUNER

Published:2009/7/15 3:55:00 Author:Jessie | From:SeekIC

DC bias voltages are used in place of mechanical switches for channel selection. Values for tuned circuit's depend on varactor diode used, With high-capacitance varactor diode, tuning voltage ranges from 4.3 V for channel 2 to 23 V for channel 13. Corresponding voltages for low-capacitance varactor are 2.2 V and 20.4 V. Tuner noise figure is in range of 4-5 dB.-J. Hopkins, Printed Circuit VHF TV Tuners Using Tuning Diodes, Motorola, Phoenix, AZ, 1972, AN-544A. p 4.



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