FOUR_OUTPUT_WAVEFORM_GENERATOR

Published:2009/7/7 0:57:00 Author:May | From:SeekIC

Many applications require control signals that have phase shifts with reference to an input signal. Circuit acceptsa sine, square, or triangular wave as an input reference signal and produces square-wave out-puts with 0°, 90°, 180°,and 270° phase shifts with respect to the input. Figure 38-3B shows the input and output waveforms. The circuit contains two ICs: an LM565 phase-locked loop and a 7474 dual-D posi-tive edge-triggered flip-flop. R1 and C1 set the free-running frequency of the LM565's VCO. You should adjust RI so that the frequency is approximately four times that of the input reference signal. The LM565 responds to input signals greater than 10 mV pk-pk; 3 V pk-pk is the,hipb maximum allowable input level. Q1 matches the LM565's output to the flip-flops' inputs. The flip-flops' outputs provide the TTL-compati-ble square-wave signals with 0°, 90°, 180°, and 270° phase shift with reference to the input signal.



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