1_MHz_bandpass_filter_insertion_loss_tester

Published:2009/7/17 5:24:00 Author:Jessie | From:SeekIC

1 MHz bandpass filter insertion-loss tester. The test is performed by sweeping the amplitude of the input signal and comparing the envelopes of the input and output signals, The test signal is produced by modulating a 1 MHz sinusoidal carrier with a 10-volt 1 kHz ramp using a 429 multiplier. The test signal is demodulated by the diode-connected AD812A and network R1-R2-C1.The signal coming out of the filter under test is passed through an identical network consisting of AD812B, R3, R4 and C2. The AD521 compares the two demodulated outputs (courtesy Analog Devices, Inc.).



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