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198 Chapter 9
Tw o -To n e Wav e fo rm Ge ne r at or
Creating, Viewing, and Modifying Two-Tone Waveforms
Figure 9-3
To Minimize Carrier Feedthrough
This procedure describes how to minimize carrier feedthrough and measure the difference in power
between the tones and their intermodulation distortion products. Carrier feedthrough only occurs
with center- aligned two- tone waveforms.
This procedure builds upon the previous procedure.
1. On the spectrum analyzer, set the resolution bandwidth for a sweep rate of about
100- 200 ms. This will allow you to dynamically view the carrier feedthrough spike as you make
adjustments.
2. On the signal generator, press
I/Q > I/Q Adjustments > I/Q Adjustments Off On to On.
3. Press
I Offset and turn the rotary knob while observing the carrier feedthrough with the spectrum
analyzer. Changing the I offset in the proper direction will reduce the feedthrough level. Adjust
the level as low as possible.
4. Press
Q Offset and turn the rotary knob to further reduce the carrier feedthrough level.
5. Repeat steps 3 and 4 until you have reached the lowest possible carrier feedthrough level.
Carrier
Feedthrough
Intermodulation
Distortion
Two-Tone
Channels
Carrier Feedthrough
Distortion
- 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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