The next illustration shows a similar glitch occurring for a negative high-voltage pulse,
where the input has been biased “on” to provide a normally-zero output voltage:
CONTROLLING THE TRANSITION TIME
The positive and negative pulse generators in the AVRQ-5-B are basically switched
current sources. The voltage rise time can be controlled by deliberately soldering
capacitance between the two “CAP” pads on the daughterboards (between the GND1
and GND2 signals). This capacitance should be added using high-voltage (> 2 kV)
ceramic capacitors. Factory tests are conducted using Vishay Cera-Mite 564R-series
capacitors, which are readily available for purchase from Newark. Some of the tests
below use series or parallel combinations of part number 564R30GAT15, which is a
150 pF / 3 kV capacitor:
http://www.newark.com/vishay-sprague/564r30gat15/ceramic-
capacitor-150pf-3000v/dp/69K5347
.
The photo below shows a 564R30GAT15 capacitor installed:
44
HV PULSE
AMP1,
-1.5 kV
RISE TIME,
VARIABLE
LOGIC OUT
V
CC
(AMP2),
+3V TO +43V
GLITCH CAUSED BY
INADEQUATE COMMON
MODE TRANSIENT
IMMUNITY (CMTI)
Summary of Contents for AVRQ-5-B
Page 52: ...Bottom side 52 ...
Page 57: ...PCB 299B FOR ADUM241E0BRWZ 57 ...
Page 82: ...PCB 158R2 LOW VOLTAGE POWER SUPPLY ...
Page 87: ...DUT WIRING ON STANDARD DAUGHTERBOARD PCB 267C ...
Page 88: ...DUT WIRING ON CUSTOMIZED TLP2366 DAUGHTERBOARD PCB 298B ...
Page 89: ...DUT WIRING ON CUSTOMIZED ADUM241E0BRWZ DAUGHTERBOARD PCB 299B ...
Page 91: ...PERFORMANCE CHECK SHEET 91 ...