Agilent Technologies E8257C PSG Guía de usuario Pagina 135
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Chapter 3 121
Basic Digital Operation
Using Waveform Clipping
appears as a rectangle in the vector representation. With either method, the objective is to clip the
waveform to a level that effectively reduces spectral regrowth, but does not compromise the integrity
of the signal. Figure 3- 16 on page 123 uses two complementary cumulative distribution plots to show
the reduction in peak–to–average power that occurs after applying circular clipping to a waveform.
The lower you set the clipping value, the lower the peak power that is passed (or the more the signal
is clipped). Often, the peaks can be clipped successfully without substantially interfering with the rest
of the waveform. Data that might be lost in the clipping process is salvaged because of the error
correction inherent in the coded systems. If you clip too much of the waveform, however, lost data is
irrecoverable. You may have to try several clipping settings to find a percentage that works well.
Figure 3-14 Circular Clipping
- Agilent Technologies 1
- E8257D/67D & E8663D 1
- PSG Signal Generators 1
- Contents 10
- Documentation Overview 13
- 1 Signal Generator Overview 15
- 2 Chapter 1 16
- Signal Generator Overview 16
- Chapter 1 3 17
- Signal Generator Overview 17
- Chapter 1 5 19
- Firmware Upgrades 20
- Modes of Operation 21
- Analog Modulation 22
- Digital Modulation 22
- Front Panel 23
- 8. Trigger 25
- 9. MENUS 25
- 10. Help 25
- 11. EXT 1 INPUT 25
- Chapter 1 13 27
- 14 Chapter 1 28
- 34. DATA CLOCK 29
- 35. DATA 29
- 36. Q Input 29
- 37. I Input 29
- 3. Annunciators 7. Text Area 30
- 1. Active Entry Area 31
- 2. Frequency Area 31
- 3. Annunciators 31
- Utility > Error Info 33
- Rear Panel 34
- Chapter 1 21 35
- 1. EVENT 1 38
- 2. EVENT 2 38
- 3. PATTERN TRIG IN 38
- 4. BURST GATE IN 38
- 5. AUXILIARY I/O 39
- 6. DIGITAL BUS 40
- 7. Q OUT 40
- 8. I OUT 40
- 9. WIDEBAND I INPUTS 40
- 10. I–bar OUT 40
- 11. WIDEBAND Q INPUTS 41
- 14. Q–bar OUT 41
- 15. AC Power Receptacle 42
- 16. GPIB 42
- 17. 10 MHz EFC 42
- 19. AUXILIARY INTERFACE 43
- 20. 10 MHz IN 43
- 30 Chapter 1 44
- 28. TRIGGER IN 45
- 29. SOURCE SETTLED 45
- 30. SOURCE MODULE INTERFACE 45
- 31. RF OUT 46
- 32. EXT 1 46
- 33. EXT 2 46
- Chapter 1 33 47
- 40. SYMBOL SYNC 48
- 41. Q IN 48
- 42. DATA 48
- 43. LF OUT 48
- Chapter 1 35 49
- 36 Chapter 1 50
- 2 Basic Operation 51
- Using Table Editors 52
- Table Ed it or Soft ke ys 53
- 40 Chapter 2 54
- Basic Operation 54
- Configuring the RF Output 56
- OFFS indicator 57
- Configuring a Swept RF Output 59
- 50 Chapter 2 64
- Chapter 2 53 67
- Basic Operation 67
- Chapter 2 57 71
- 58 Chapter 2 72
- Modulating a Signal 73
- Using Data Storage Functions 75
- Using Security Functions 79
- 66 Chapter 2 80
- Chapter 2 67 81
- 72 Chapter 2 86
- Using the Secure Display 87
- Enabling Options 88
- Using the Web Server 89
- 76 Chapter 2 90
- Chapter 2 77 91
- 78 Chapter 2 92
- 3 Basic Digital Operation 93
- 82 Chapter 3 96
- Chapter 3 85 99
- Dual ARB Player softkey 99
- Note: When the dual ARB 102
- Accessing the Dual ARB Player 105
- Creating Waveform Segments 106
- Playing a Waveform 108
- Editing a Waveform Sequence 108
- Using Waveform Markers 110
- Waveform Marker Concepts 111
- Chapter 3 99 113
- Basic Digital Operation 113
- Positive Polarity 113
- Accessing Marker Utilities 115
- Viewing a Marker Pulse 122
- Triggering Waveforms 125
- Mode and Response 126
- PAT TRIG IN 2 pin on 127
- PATTERN TRIG IN connector 127
- Using Gated Triggering 128
- Using Waveform Clipping 131
- 118 Chapter 3 132
- Basic Digital Operation 132
- Chapter 3 119 133
- 120 Chapter 3 134
- Chapter 3 121 135
- 122 Chapter 3 136
- Configuring Circular Clipping 137
- Using Waveform Scaling 139
- 126 Chapter 3 140
- 4 Optimizing Performance 143
- 10 kHz, or 100 kHz. 144
- +25 dBm 146
- Chapter 4 133 147
- Optimizing Performance 147
- 134 Chapter 4 148
- Optimizing Performance 148
- Chapter 4 135 149
- 140 Chapter 4 154
- Chapter 4 141 155
- 1EU, or 521 156
- Chapter 4 143 157
- 148 Chapter 4 162
- Chapter 4 149 163
- 150 Chapter 4 164
- 5 Analog Modulation 165
- Configuring AM (Option UNT) 166
- Configuring FM (Option UNT) 166
- Configuring M (Option UNT) 167
- To Activate M 168
- To Activate Pulse Modulation 168
- Custom Arb Waveform Generator 173
- Working with Filters 176
- Using a Predefined FIR Filter 177
- Chapter 6 167 181
- Mirror Table 181
- Working with Symbol Rates 183
- 170 Chapter 6 184
- Working with Modulation Types 185
- Symbol Data I Value Q Value 188
- 0 188
- 1 188
- 2 188
- 3 188
- Configuring Hardware 192
- Chapter 6 179 193
- RF On/Off 193
- 180 Chapter 6 194
- Custom Real Time I/Q Baseband 195
- Working with Data Patterns 196
- Working with Burst Shapes 201
- Working with Phase Polarity 206
- Chapter 7 193 207
- Chapter 7 195 209
- Using Differential Encoding 211
- 200 Chapter 7 214
- 8 GPS Modulation (Option 409) 215
- Real Time MSGPS 216
- Chapter 8 203 217
- Scenario Files 218
- RF Power Level Considerations 219
- 206 Chapter 8 220
- Chapter 8 207 221
- 208 Chapter 8 222
- GPS Ref (f0) 223
- GPS Ref (f0) softkey 223
- Real Time GPS 224
- Real Time GPS Introduction 225
- 212 Chapter 8 226
- 214 Chapter 8 228
- Chapter 8 215 229
- 216 Chapter 8 230
- 218 Chapter 8 232
- Testing Receiver Sensitivity 233
- GPS Modulation (Option 409) 234
- Multitone Waveform Generator 235
- To View a Multitone Waveform 237
- 230 Chapter 9 244
- Two–Tone Waveform Generator 245
- 232 Chapter 10 246
- Chapter 10 233 247
- Two–Tone Waveform Generator 247
- 11 AWGN Waveform Generator 251
- Real Time I/Q Baseband AWGN 252
- 12 Peripheral Devices 253
- LVDS 100 MHz 400 MHz 255
- 244 Chapter 12 258
- Peripheral Devices 258
- Internally Generated Clock 259
- Device (DUT) Supplied Clock 259
- 246 Chapter 12 260
- 1 Sample Period 261
- 4 Clocks Per Sample 262
- 2 Clocks Per Sample 262
- 1 Sample 265
- Frame Marker 265
- Data Bits 265
- Data Types 268
- 256 Chapter 12 270
- Logic Type softkey 270
- Accesses the data setup menu 272
- Clock Setup softkey 274
- Accesses the Clock Setup Menu 274
- 10 MHz and above 200 MHz 275
- Inactive for Input mode 282
- Chapter 12 273 287
- Peripheral Devices 287
- 274 Chapter 12 288
- Chapter 12 275 289
- Using Other Source Modules 290
- Chapter 12 277 291
- 13 Troubleshooting 293
- RF Output Power too Low 294
- SIGNAL GENERATOR 295
- OUTPUT CONTROL 295
- 284 Chapter 13 298
- Troubleshooting 298
- RF Output Power Problems 298
- Sweep Problems 300
- Data Storage Problems 301
- Cannot Turn Off Help Mode 302
- Signal Generator Locks Up 302
- Error Messages 303
- Error Message File 304
- Error Message Format 304
- Error Message Types 304
- Chapter 13 291 305
- Troubleshooting 305
- 292 Chapter 13 306
- 43, 44, 153 314
- binary use 259, 271 314
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