Changes between Version 4 and Version 5 of HVPulser_RevA_Testing_1_16_20


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Timestamp:
Feb 11, 2020, 1:05:50 PM (3 years ago)
Author:
Michael
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  • HVPulser_RevA_Testing_1_16_20

    v4 v5  
    66'''Control Signals:''' Using test points on the ToF Adapter the wave forms for the positive end of the HV_pos and HV_neg ECL signals were captured [[BR]][[Image(http://gauss.bu.edu/svn/tof-system/Gallery/2020-01-16/HV_POS+_small.jpg, 15%, link=[http://gauss.bu.edu/svn/tof-system/Gallery/2020-01-16/HV_POS+.jpg])]] [[Image(http://gauss.bu.edu/svn/tof-system/Gallery/2020-01-16/HV_NEG+_small.jpg, 15%, link=[http://gauss.bu.edu/svn/tof-system/Gallery/2020-01-16/HV_NEG+.jpg])]][[BR]]These signals fit the expectations of ECL logic standards.
    77
    8 The HV_pos signal is used to control the High-Gate (connected to output and ground) of the switching circuit and the HV_neg signal is used to control the Low-Gate (connected to output and switching voltage 'nominally -200v') of the switching circuit. When the high gate is on the output swings to ground and when the low gate is on the output swings to the switching voltage. the switching of the HV_pos and hv_neg signals can then be used to swing the output. These two pictures show the control signals displayed above and output waveform to demonstrate this. [[Image(http://gauss.bu.edu/svn/tof-system/Gallery/2020-01-16/HV_out_and_pos_small.jpg, 15%, link=[http://gauss.bu.edu/svn/tof-system/Gallery/2020-01-16/HV_out_and_pos.jpg])]] [[Image(http://gauss.bu.edu/svn/tof-system/Gallery/2020-01-16/HV_out_and_neg_small.jpg, 15%, link=[http://gauss.bu.edu/svn/tof-system/Gallery/2020-01-16/HV_out_and_neg.jpg])]]
     8The HV_pos signal is used to control the High-Gate (connected to output and ground) of the switching circuit and the HV_neg signal is used to control the Low-Gate (connected to output and switching voltage 'nominally -200v') of the switching circuit. When the high gate is on the output swings to ground and when the low gate is on the output swings to the switching voltage. the switching of the HV_pos and hv_neg signals can then be used to swing the output. These two pictures show the control signals displayed above and output waveform to demonstrate this. [[BR]][[Image(http://gauss.bu.edu/svn/tof-system/Gallery/2020-01-16/HV_out_and_pos_small.jpg, 15%, link=[http://gauss.bu.edu/svn/tof-system/Gallery/2020-01-16/HV_out_and_pos.jpg])]] [[Image(http://gauss.bu.edu/svn/tof-system/Gallery/2020-01-16/HV_out_and_neg_small.jpg, 15%, link=[http://gauss.bu.edu/svn/tof-system/Gallery/2020-01-16/HV_out_and_neg.jpg])]]
    99
    1010The HV_on signal is used to control a fixed current supply on the HVPulser. The current supply supplies ~3mA but this can be changed by adjusting the value of R14 (resistor connected to collector of NPN Q2). The current can be calculated by dividing 1.5V by the value of R14. The effect of this current supply will be discussed in the output section of this write up.