Agilent Technologies 4000 X Manual de Serviço Página 162
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162 4000 X-Series Oscilloscopes Advanced Training Guide
B Oscilloscope Bandwidth Tutorial
Digital Clock Measurement Comparisons
Figure 106 shows the waveform results when measuring a 100 MHz digital
clock signal with fast edge speeds using a 100 MHz bandwidth
oscilloscope. As you can see, this scope primarily just passes through the
100 MHz fundamental of this clock signal, thus representing our clock
signal as an approximate sine wave. A 100 MHz scope may be a good
solution for many 8- bit, MCU- based designs with clock rates in the
10 MHz to 20 MHz range, but 100 MHz bandwidth is clearly insufficient
for this 100 MHz digital clock signal.
Using a 500 MHz bandwidth oscilloscope, Figure 107 shows that this scope
is able to capture up to the fifth harmonic, which was our first rule of
thumb recommendation. But when we measure the rise time, we see that
the scope measures approximately 750 ps. In this case, the scope is not
making a very accurate measurement on the rise time of this signal. The
scope is actually measuring something closer to its own rise time (700 ps),
not the input signal’s rise time, which is closer to 500 ps. We need a
higher-bandwidth scope for this digital measurement application if timing
measurements are important.
Figure 106 100 MHz digital clock signal captured on a 100 MHz bandwidth scope
- Agilent 4000 X-Series 1
- Oscilloscopes 1
- Contents 3
- Getting Started 5
- Front Panel Overview 6
- Run Control 7
- Waveform Controls 7
- Horizontal Controls 8
- Vertical Controls 9
- Trigger Controls 9
- Tools Controls 10
- Advanced Training Guide 11
- Lab #3: Using Waveform Math 23
- Lab #6: Using Mask Test 37
- Trigger Point 45
- Next Valid Trigger Event 45
- , which is coincident with 77
- Acquisition Labs 79
- C Serial Bus Signals 80
- 13 Tap the Mode I 88
- 14 Tap the Signals softkey 88
- 10 Tap the Mode I 111
- S Serial Bus Signals 118
- (USB) Signals 132
- USB traffic 138
- Theory of Operation 151
- DSO Block Diagram 152
- ADC Block 152
- Attenuator Block 153
- DC Offset Block 153
- Amplifier Block 153
- Display DSP Block 155
- Rule of Thumb 159
- Step 2: Calculate f 160
- Related Agilent Literature 165
- C Related Agilent Literature 166
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