Anritsu MG3710A Application Note
  1. Manuals
  2. Brands
  3. Anritsu Manuals
  4. Portable Generator
  5. MG3710A
  6. Application note

Anritsu MG3710A Application Note

Vector signal generator
Hide thumbs Also See for MG3710A:
Table of Contents

Advertisement

Quick Links

Download this manual
Application Note
MG3710A
Vector Signal Generator
Optimization Technique using
Two-signal Combine Function
MG3710A
Vector Signal Generator

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the MG3710A and is the answer not in the manual?

Questions and answers

Subscribe to Our Youtube Channel

Related Manuals for Anritsu MG3710A

Summary of Contents for Anritsu MG3710A

  • Page 1 Application Note MG3710A Vector Signal Generator Optimization Technique using Two-signal Combine Function MG3710A Vector Signal Generator...

  • Page 2: Table Of Contents

    4.2. AM Noise ................................. 13 4.3. Floor Noise ..............................14 5. Practical Examples ............................... 15 5.1. ARIB STD-T61Adjacent Channel Selectivity ....................15 5.1.1. Structure of Measurement System using MG3710A ................15 5.1.2. Setting Procedure ........................... 17 6. Summary................................21 MG3710A-E-F-4-(1.00)

  • Page 3: Introduction

    1. Introduction This document introduces the two-signal combine function of the MG3710A Vector Signal Generator (MG3710A hereafter) and explains an optimized technique for measurement using this function. 1.1. Technical Terms This section explains the technical terms used in this document.

  • Page 4: Two-Signal Combine Function

    A general vector signal generator outputs one type of waveform pattern from one RF output. Using the two-signal combine function, the MG3710A can combine the waveform selected in Memory A with the waveform selected in Memory B for simultaneous output. In addition, the level ratio, frequency offset and time offset of each selected waveform can be set easily from the panel (Figure 2).

  • Page 5: Advantages Of Two-Signal Combine Function

    Additionally, the work required to set the level ratio of the wanted and interference waves is quite difficult (Figure 4). Using the all-in-one MG3710A two-signal combine function outputs both the wanted and interference signals and offers the following advantages (Figure 4).

  • Page 6: Linearity

    To solve this problem, the MG3710A has a rate matching function (Figure 6) to output the combined two signals with each sampling rate maintained even for the same signals with different sampling rates.

  • Page 7: Optimization Technique

    3. Optimization Technique This section explains the MG3710A optimization technique for obtaining the best performance when using the two- signal combine function. 3.1. Avoiding Carrier Leak and Image 3.1.1. Carrier Leak and Image A signal generator generates the RF signal by synthesizing the baseband signal and LO signal at the quadrature modulator, but spurious components called carrier leak an image are also generated at this time.
  • Page 8 When using the two signal combine function, it is necessary to note that there may be a larger effect when the two signal level ratio is large, because the lower level signal may approach the level of the carrier leak/image. MG3710A-E-F-4-(1.00)

  • Page 9: Improvement And Prevention Methods

    (a) Carrier leak (b) Image Figure 11. MG3710A Carrier Leak and Image Frequency Characteristics (after I/Q Calibration) (Measured Values) Although the I/Q Calibration function minimizes the carrier leak and image, it does not completely remove them. When the carrier leak/image reduction effect using the I/Q Calibration function is inadequate, adjusting the frequency offset so that the output waveform and carrier leak/image do not overlap can prevent the effect.

  • Page 10: Reducing Two-Signal Third Order Distortion

    (0 Effect on Wanted Signal.) Using the MG3710A, the baseband frequency for Memory A and Memory B can be set at Frequency Offset A and Frequency Offset B, respectively.

  • Page 11: Reduction Method

    If the RMS Value Tuning setting is too large, sometimes waveform data clipping occurs in the baseband block. If  clipping occurs, BBDAC is displayed in the MG3710A warning field and large spurious occurs. Select the RMS Value Tuning setting to prevent clipping (Figure 14, Figure 15).

  • Page 12: Improvement Of In-Band Frequency Characteristics

    0 Hz baseband frequency. 3.3.1. Improvement Method The MG3710A has an Internal Channel Correction function for correcting the in-band frequency characteristics. Figures 16 and 17 show the sample values for the in-band frequency characteristics when this function is Off and On, respectively.

  • Page 13: Other Consideration Points

    Frequency Figure 18. Phase Noise Using the MG3710A Phase Noise Optimize function optimizes the phase noise by selecting from the near and far phase noise characteristics. Switching the Phase Noise setting value performs optimization according to the offset frequency to be used.

  • Page 14: Am Noise

    Frequency Figure 21. AM Noise Figure 22 shows the AM noise characteristics of the MG3710A. CW means an unmodulated signal and ATT Hold = Off; Mod means a modulated or unmodulated signal and ATT Hold = On. Figure 22. MG3710A AM Noise Characteristics (Measurement Value)

  • Page 15: Floor Noise

    If the RMS Value Tuning setting is too large, sometimes waveform data clipping occurs in the baseband block. If  clipping occurs, BBDAC is displayed in the MG3710A warning field and large spurious occurs. Select the RMS Value Tuning setting to prevent clipping (Figure 14, Figure 15).

  • Page 16: Practical Examples

    ±6.25kHz Separation: <–63 dB  Modulation accuracy EVM(rms) within 3% (recommended)  Consider each of the following points:  Frequency Since the ARIB STD-T61 wireless frequency band is 400 MHz and 150 MHz, the MG3710A supports either band as an option. MG3710A-E-F-4-(1.00)
  • Page 17 002/102 (High-Stability Reference Oscillator).  ACLR The MG3710A measures the actual value of the adjacent channel leakage power using a spectrum analyzer. Figure 27 shows an example of the measurement results. The top leakage power is –73.44 dB, and the bottom is –73.60 dB, satisfying the standards.

  • Page 18: Setting Procedure

    Figure 29. Load Screen Note the following point when loading the waveform pattern. Pre-load waveform patterns into the MG3710A. Refer to the MG3700A/MG3710A Vector Signal Generator  Instruction Manual for how to create waveform patterns and copy them to the MG3710A. MG3710A-E-F-4-(1.00)
  • Page 19 (Key operation: Set Mode key – [F3] ARB Setup – [F2] Level A to –52 dBm.) Set the Memory B output to On. (Key operation: Set [F3] Output B to On.) Set the output level for Memory A to –10 dBm. (Key operation: Set [F4] Level B to –10 dBm.) MG3710A-E-F-4-(1.00)
  • Page 20 (4) Set the frequency offset. Set Center Signal to A. By doing this the frequency display at the top of the MG3710A screen is referenced to Memory A. The Memory-B value is fixed at the LO frequency position. (Key operation: Set Mode key – [F3] ARB Setup – Mode key – [F4] Center Signal to A.) Set the frequency offset of Memory A to 6.25 kHz.
  • Page 21 Figure 32. Output Signal Spectrum MG3710A-E-F-4-(1.00)

  • Page 22: Summary

    Additionally, the work required to set the level ratio of the wanted and interference waves is quite difficult. Using the two-signal combine function of the Anritsu MG3710A Vector Signal Generator supports easy setup of a test environment for outputting both the wanted and interference waves from one instrument.
  • Page 23 Note MG3710A-E-F-4-(1.00)
  • Page 24 No. 1 Science Museum Road, Tsim Sha Tsui East, Anritsu A/S (Service Assurance) Phone: +55-11-3283-2511 Kowloon, Hong Kong, P.R. China Fax: +55-11-3288-6940 Anritsu AB (Test & Measurement) Phone: +852-2301-4980 Fax: +852-2301-3545 • Kay Fiskers Plads 9, 2300 Copenhagen S, Denmark...

Table of Contents