Anritsu MP2110A BERTWave - Page 49

1.5 Technical Terms
1-23
1
Outline
DCD: Duty Cycle Distortion
The duty cycle distortion (DCD) is found from the following equation:
DCD = (t
2
– t
1
)/Bp × 100 (%)
Where,
t
1
: Time at crossing point between 50% level of Eye Amplitude and
rising waveform
t
2
: Time at crossing point between 50% level of Eye Amplitude and
falling waveform
Bp: Bit cycle
t
1
t
2
Bp
50%
0%
100%
Eye Amplitude
t
2
–t
1
Figure 1.5-4 Duty Cycle Distortion