Cisco GainMaker Optoelectronic Node 1GHz with 65 86 MHz Split Technical References
78-4021314-01 Rev D
3
Identifying Units Containing Fractured Capacitor(s)
Identifying Units Containing Fractured Capacitor(s)
The fractured-capacitor condition described above only exists in the 1 GHz
GainMaker amplifiers and nodes identified earlier. The capacitors were added to
these units as part of new circuits required for conversion to a 1 GHz product.
Reduced gain in the forward band, particularly at low frequencies, is a symptom of a
Reduced gain in the forward band, particularly at low frequencies, is a symptom of a
possible fractured-capacitor condition. In the figure below, the plot labeled Normal
response shows typical amplifier or node gain at 54 MHz. The plot labeled
Response with roll-off condition shows the greatly reduced gain at the lower end of
the band.
Note: This plot shows a gain reduction of nearly 15 dB at 54 MHz, but as little as 5
dB gain reduction at 54 MHz may indicate a fractured-capacitor condition.