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Chapter 11 207
Peripheral Devices
N5102A Digital Signal Interface Module
Clock Source
The clock signal for the N5102A module is provided in one of three ways through the following
selections:
• Internal: generated internally in the interface module (requires an external reference)
•External: generated externally through the Ext Clock In connector
•Device: generated externally through the Device Interface connector
The clock source is selected using the N5102A module UI on the signal generator, as shown in
Figure 11- 2.
Figure 11-2 Clock Source Selection
When you select a clock source, you must let the N5102A module know the frequency of the clock
signal using the
Clock Rate softkey. In the internal clock source mode, use this softkey to set the
internal clock rate. For device and external clock sources, this softkey must reflect the frequency of
the applied clock signal.
When the clock source is Internal, a frequency reference must be applied to the Freq Ref connector.
The frequency of this applied signal needs to be specified using the
Reference Frequency softkey, unless
the current setting matches that of the applied signal.
The selected clock source provides the interface module output clock signal at the Clock Out and the
Device Interface connectors.
Common Frequency Reference
The clocking flexibility of the digital signal interface module allows the setting of arbitrary clock rates
for the device under test. In general, the clock rate inside the PSG will be different from the interface
module clock rate, so the interface module performs a rate conversion. An important aspect of this
conversion is to have accurate clock rate information to avoid losing data. The module relies on
relative clock accuracy, instead of absolute accuracy, that must be ensured by using a single
frequency reference for all clock rates involved in the test setup. This can be implemented in various
ways (see the five drawings in Figure 11- 3 on page 209), but whatever way it is implemented, the
External and Device selection:
Set to match the clock rate
of the applied clock signal
Internal selection: Set the
internal clock rate
Internal clock source
selection: Set the frequency
of the applied reference
signal.
- User’s Guide 1
- Contents 10
- Documentation Overview 13
- 1 Signal Generator Overview 15
- 2 Chapter 1 16
- Signal Generator Overview 16
- Chapter 1 3 17
- Firmware Upgrades 18
- Modes of Operation 19
- Digital Modulation 20
- Front Panel 21
- 8. Trigger 23
- 9. MENUS 23
- 10. Help 23
- 11. EXT 1 INPUT 23
- Chapter 1 11 25
- 12 Chapter 1 26
- 34. DATA CLOCK 27
- 35. DATA 27
- 36. Q Input 27
- 37. I Input 27
- Front Panel Display 28
- 1. Active Entry Area 29
- 2. Frequency Area 29
- 3. Annunciators 29
- 5. Amplitude Area 31
- 6. Error Message Area 31
- 7. Text Area 31
- 8. Softkey Label Area 31
- Rear Panel 32
- Chapter 1 19 33
- 20 Chapter 1 34
- Chapter 1 21 35
- 1. EVENT 1 36
- 2. EVENT 2 36
- 3. PATTERN TRIG IN 36
- 4. BURST GATE IN 36
- 5. AUXILIARY I/O 37
- 6. DIGITAL BUS 38
- 7. Q OUT 38
- 8. I OUT 38
- 9. WIDEBAND I INPUTS 38
- 10. I-bar OUT 39
- 11. WIDEBAND Q INPUTS 39
- 12. COH CARRIER 39
- 14. Q-bar OUT 40
- 15. AC Power Receptacle 40
- 16. GPIB 40
- 17. 10 MHz EFC 40
- 19. AUXILIARY INTERFACE 41
- 20. 10 MHz IN 41
- 22. 10 MHz OUT 42
- 23. STOP SWEEP IN/OUT 42
- 24. BASEBAND GEN CLK IN 42
- 25. Z-AXIS BLANK/MKRS 42
- 26. SWEEP OUT 42
- Chapter 1 29 43
- 30 Chapter 1 44
- 39. I IN 45
- 40. SYMBOL SYNC 45
- 41. Q IN 45
- 42. DATA 45
- 43. LF OUT 46
- 2 Basic Operation 47
- Using Table Editors 48
- Table Ed it or So ftke y s 49
- Configuring the RF Output 50
- OFFS indicator 51
- Configuring a Swept RF Output 52
- Chapter 2 43 57
- Basic Operation 57
- Trigger hardkey 57
- Sweep Repeat Single Cont 57
- 46 Chapter 2 60
- Markers 60
- Chapter 2 47 61
- Chapter 2 51 65
- 52 Chapter 2 66
- Modulating a Signal 67
- Using Data Storage Functions 69
- Using Security Functions 73
- 60 Chapter 2 74
- Chapter 2 61 75
- 62 Chapter 2 76
- Table 2-4 Hard Disk Memory 76
- Chapter 2 65 79
- Enabling Options 80
- Using the Web Server 81
- Activating the Web Server 82
- Chapter 2 69 83
- 70 Chapter 2 84
- 3 Basic Digital Operation 85
- 74 Chapter 3 88
- Chapter 3 77 91
- Dual ARB Player softkey 91
- Note: When the dual ARB 94
- Accessing the Dual ARB Player 97
- Creating Waveform Segments 98
- Playing a Waveform 100
- Editing a Waveform Sequence 100
- Using Waveform Markers 102
- Waveform Marker Concepts 103
- Accessing Marker Utilities 106
- Viewing a Marker Pulse 113
- Triggering Waveforms 116
- Mode and Response 117
- Accessing Trigger Utilities 118
- Using Gated Triggering 119
- Using Waveform Clipping 122
- Chapter 3 109 123
- Basic Digital Operation 123
- 110 Chapter 3 124
- Chapter 3 111 125
- 112 Chapter 3 126
- Chapter 3 113 127
- Configuring Circular Clipping 128
- Using Waveform Scaling 130
- Chapter 3 117 131
- 4 Optimizing Performance 133
- Using External Leveling 134
- 122 Chapter 4 136
- Optimizing Performance 136
- Chapter 4 123 137
- 124 Chapter 4 138
- Chapter 4 129 143
- 130 Chapter 4 144
- Chapter 4 131 145
- Internal Timebase: 125 Hz 149
- External Timebase: 25 Hz 149
- 136 Chapter 4 150
- 5 Analog Modulation 151
- Configuring AM (Option UNT) 152
- Configuring FM (Option UNT) 152
- Configuring ΦM (Option UNT) 153
- To Activate ΦM 154
- To Activate Pulse Modulation 154
- Custom Arb Waveform Generator 157
- Working with Filters 160
- Using a Predefined FIR Filter 161
- Chpater 6 151 165
- Mirror Table 165
- Working with Symbol Rates 167
- 154 Chpater 6 168
- Working with Modulation Types 169
- Symbol Data I Value Q Value 172
- 0 0000 0.500000 1.000000 172
- 1 0001 −0.500000 1.000000 172
- 2 0010 0.500000 −1.000000 172
- 3 0011 −0.500000 −1.000000 172
- Configuring Hardware 176
- To Set the ARB Reference 177
- 164 Chpater 6 178
- Custom Real Time I/Q Baseband 179
- Working with Data Patterns 180
- Working with Burst Shapes 185
- To Adjust the I/Q Scaling 190
- Working with Phase Polarity 191
- Chapter 7 179 193
- Using Differential Encoding 195
- 1. The symbol rotates 197
- 184 Chapter 7 198
- Multitone Waveform Generator 199
- To View a Multitone Waveform 201
- 194 Chapter 8 208
- 9 Two-Tone Waveform Generator 209
- 196 Chapter 9 210
- Tw o To n e O f f O n to On 210
- Chapter 9 197 211
- 10 AWGN Waveform Generator 215
- Real Time I/Q Baseband AWGN 216
- 11 Peripheral Devices 217
- LVDS 100 MHz 400 MHz 219
- 208 Chapter 11 222
- Peripheral Devices 222
- Internally Generated Clock 223
- Device (DUT) Supplied Clock 223
- 210 Chapter 11 224
- 1 Clock Per Sample 225
- 4 Clocks Per Sample 226
- 2 Clocks Per Sample 226
- 1 Sample Period 227
- 256 Clock Rate× 229
- Data Types 232
- 220 Chapter 11 234
- Logic Type softkey 234
- 222 Chapter 11 236
- Scaling softkey 238
- Chapter 11 225 239
- Chapter 11 231 245
- 232 Chapter 11 246
- Clock Source softkey 246
- Accesses the data setup menu 248
- Chapter 11 237 251
- 238 Chapter 11 252
- Chapter 11 239 253
- Using Other Source Modules 254
- Chapter 11 241 255
- 12 Troubleshooting 257
- RF Output Power too Low 258
- SIGNAL GENERATOR 259
- OUTPUT CONTROL 259
- Sweep Problems 262
- Data Storage Problems 263
- Cannot Turn Off Help Mode 264
- Signal Generator Locks Up 264
- Error Messages 265
- Error Message File 266
- Error Message Format 266
- Error Message Types 266
- Chapter 12 253 267
- Troubleshooting 267
- 254 Chapter 12 268
- 37, 38, 139 275
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