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Performance Tests
Digital Modulation Level Accuracy
3-27
Digital Modulation Level Accuracy
This automated test verifies the level accuracy of the signal generator’s I and Q modulation inputs. Two
arbitrary waveform generators provide the I and Q modulation inputs to the signal generator. A power meter
measures the RF output power with and without QPSK modulation applied to the signal generator. The
difference in power measurements is the level accuracy. The QPSK modulation is loaded into the two
arbitrary waveform generators from a data file in the Service Support Software. The vector signal analyzer
verifies the arbitrary waveform generator’s outputs are properly scaled and synchronized before the relative
power level accuracy is measured.
Recommended Equipment
• Agilent E4418B E-Series power meter
• Agilent E9304A E-Series power sensor
• Agilent E4438C ESG vector signal generator with Option 001 or 002,
or Agilent E4430B thru E4437B ESG-D Series signal generator with Option UN8
Equipment Setup
Figure 3-24 Digital Modulation Level Accuracy Setup
- Calibration Guide 1
- Contents 10
- 1 Getting Started 11
- Overview of Getting Started 12
- Confirming Equipment 13
- Software Configuration 17
- Starting the Software 32
- Identifying the DUT 33
- Exiting the Software 39
- Getting Started 40
- 2 Required Equipment 41
- Table 2-1 Required Equipment 43
- 3 Performance Tests 49
- Overview of Performance Tests 50
- Running Performance Tests 52
- Recommended Equipment 57
- Equipment Setup 57
- Equipment Setups 58
- Performance Tests 59
- FM Frequency Response 61
- AM Frequency Response 62
- Residual FM 66
- Figure 3-17 Residual FM 67
- Power Level Accuracy 69
- Timebase Aging Rate 72
- (Option 402 Only) 76
- Pulse Modulation On/Off Ratio 79
- Burst Modulation On/Off Ratio 80
- CDMA Adjacent Channel Power 81
- WCDMA Adjacent Channel Power 82
- (Option 400) 82
- Phase Noise and Residual FM 83
- Measuring Residual FM 86
- GSM Loopback BER Check 89
- (Option 300 Only) 89
- Performance Test Records 90
- 4 Adjustments 93
- Overview of Adjustments 94
- Adjustment Relationships 97
- Analog Bus ADC Calibration 100
- Pretune Calibration 101
- Internal Source Calibration 102
- Description 103
- Required Test Equipment 103
- Procedure 103
- Timebase DAC Calibration 106
- FM Path Offset Calibration 108
- FM Out-of-Band Calibration 113
- FM/PM Out-of-Band Calibration 114
- DCFM Calibration 116
- Burst Modulator Calibration 119
- Prelevel Calibration 120
- VBLO Mixer Bias Calibration 121
- ALC Calibration 124
- Adjustments 130
- Power Search Calibration 131
- AM Gain Calibration 132
- I/Q Impairment Calibration 134
- Index I-1 137
- I-2 Index 138
- Index I-3 139
- I-4 Index 140
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