FREE_RUNNING_STAIRCASE_WAVE_GENERATOR

Published:2009/6/24 2:55:00 Author:May | From:SeekIC

This free-running staircase generator uses all four of the amplifiers, which are available in one LM3900 package. Amp 1 provides the input pulses that pump up the staircase via resistor R1. Amp 2 does the integrate and hold function and also supplies the output staircase waveform. Amps 3 and 4 provide both a compare and a one-shot multivibrator function. Resistor R4 is used to sample the staircase output voltage and to compare it with the power supply voltage (V+) via R3. When the out-put exceeds approximately 80% of V+ the connection of Amps 3 and 4 causes a 100-ps reset pulse to be generated. This is coupled to the integrator (AMP2) via R2 and causes the staircase output voltage to fall to approximately 0 V. The next pulse out of Amp 1 then starts a new stepping cycle.



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