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The Anritsu MG3681A is a digital modulation signal generator covering 250 kHz to 3 GHz, built around a wideband vector modulator to output the high-accuracy, high-speed vector modulation signals required for R&D and manufacturing of digital mobile communications equipment and related devices. The frequency range covers the bands of leading mobile communications systems addressed during the instrument's design era, and the platform combines an excellent frequency response, distortion, and signal-to-noise ratio with seven internal expansion slots that accept optional modulation units and software for specific air-interface standards.
Per the datasheet, the MG3681A is intended for accurate receiver sensitivity testing and transmitter adjacent channel leakage power testing on high-speed modulation communications systems. Optional MU368040A CDMA Modulation Unit with W-CDMA software enables W-CDMA signal generation; MU368010A TDMA Modulation Unit supports PDC and GSM device test; MU368030A Universal Modulation Unit supports CDMA2000 1xEV-DO, PDC packet, and PHS signal generation; and the MU368060A AWGN Unit adds calibrated noise. The instrument also provides analog AM, FM, and øM modulation for testing of analog communications systems, and its signal purity and memory and frequency sweep functions support general-purpose signal generator use as well.
Anritsu Corporation traces its origins to 1895 in Japan and is one of the longstanding precision measurement companies in the test and measurement industry. Anritsu's RF and microwave instrument portfolio was significantly broadened by its 1990s acquisition of Wiltron Company, which brought additional network analyzer and microwave measurement technology under the Anritsu brand. Anritsu remains an independent, publicly traded Japanese manufacturer with a continuous T&M product lineage.
| Category | Parameter | Specification |
|---|---|---|
| Frequency | Range | 250 kHz to 3000 MHz, Resolution: 0.01 Hz |
| Accuracy | Depends on installed reference oscillator; Reference frequency accuracy: ± (5% of FM setting deviation + 5 Hz) for frequency modulation | |
| Internal reference oscillator | Aging rate: ±1 x 10-6/year, Temperature stability: ±1 x 10-6 (0° to 50°C) | |
| External reference input | 10 MHz/13 MHz auto-switching, ±10 ppm, ≥0.7 V(p-p)/50 Ω (AC coupled), BNC connector (rear panel) | |
| Buffer output | 10 MHz, TTL level (DC coupled), BNC connector (rear panel) | |
| Switching time | ≤20 ms (response time from final command to ±500 Hz of set frequency on GPIB at CW, ALC on; except when setting frequency crosses 600 MHz and 1010 MHz) | |
| Output Level | Range | -143 to +13 dBm (settable range: -143 to +17 dBm) |
| Unit | dBm, W, dBµV, V (dBµV, V selected terminate/open voltage display) | |
| Resolution | 0.01 dB (dBm, dBµV units), 3 digits (W, V units) | |
| Frequency response | ±1 dB (CW, ALC on, 0 dBm) | |
| Accuracy | CW, ALC on: ≤+13 dBm, ≥-127 dBm: ±1 dB (≤1 GHz), ±2 dB (>1 GHz); <-127 dBm: ±2 dB (≤1 GHz), ±3 dB (>1 GHz) | |
| Output connector | 50 Ω, N-type connector (front panel) | |
| Switching time | ≤50 ms (normal mode), ≤100 ms (safety mode), ≤10 ms (continuous mode) | |
| ALC mode | ALC time constant: Auto, 500 ns, 2.4 µs, 5 µs, 24 µs, 50 µs, 240 µs, 500 µs selectable | |
| Signal Purity | Harmonics | <-30 dBc |
| Non harmonic spurious | ≤2500 MHz: <-60 dBc (15 kHz-300 MHz offset), <-30 dBc (>300 MHz offset); >2500 MHz: <-30 dBc; Fixed frequency spurious: -50 dBc (660, 1320 MHz); Power line and Fan rotation: <-40 dBc | |
| SSB phase noise | <-118 dBc/Hz (≥10 MHz, ≤1010 MHz), <-112 dBc/Hz (>1010 MHz) at CW, 20 kHz offset | |
| AM | Range | 0 to 100% (cannot set internal/external modulation independently), Resolution: 0.1% |
| Modulation frequency response | ≤0 dBm, ALC on, ±1.5 dB based on 1 kHz modulation frequency. Lower limit: DC (Int/Ext DC coupled), 20 Hz (Ext AC coupled). Upper limit varies by carrier frequency and AM depth. | |
| Internal modulation | Requires AF synthesizer (Option 21) | |
| External modulation | 2 V(p-p) approx., 600 Ω, AC/DC coupled switchable, BNC connector (front panel) | |
| FM | Range | 0 to 1000 kHz (≥10 MHz, ≤1010 MHz), 0 to 2000 kHz (>1010 MHz) |
| Resolution | 10 Hz (0 to 10 kHz dev), 100 Hz (10.1 to 100 kHz dev), 1 kHz (101 to 1000 kHz dev), 10 kHz (1010 to 2000 kHz dev) | |
| Modulation frequency response | DC to 20 kHz (Int / Ext DC coupled), 20 Hz to 20 kHz (Ext AC coupled), ±1 dB based on 1 kHz modulation frequency | |
| External modulation | 2 V(p-p) approx., 600 Ω, AC/DC coupled switchable, BNC connector (front panel) | |
| øM | Range | 0 to 6.28 rad (≥10 MHz, ≤1010 MHz), 0 to 12.56 rad (>1010 MHz) |
| Unit / Resolution | rad, deg; rad: 0.01 rad, deg: 1 deg | |
| Modulation frequency response | DC to 20 kHz (Int / Ext DC coupled), 20 Hz to 20 kHz (Ext AC coupled), ±1 dB based on 1 kHz modulation frequency | |
| External modulation | 2 V(p-p) approx., 600 Ω, AC/DC coupled switchable, BNC connector (front panel) | |
| Wideband AM | Modulation frequency response | DC to 15 MHz (±2 dB bandwidth), DC to 30 MHz (±3 dB bandwidth). External modulation, input level: 0.9 V(p-p), ≥100 MHz, ≤0 dBm, modulation frequency of 1 kHz |
| Internal modulation | Requires digital modulation unit (option) | |
| External modulation | ≤1 V(p-p), 50 Ω, BNC connector (front panel), sensitivity: 1 V(p-p) = 100% | |
| Pulse Modulation | On/off ratio | >60 dB |
| Rise/fall time | <100 ns (external modulation) | |
| Minimum pulse width | <500 ns (external modulation) | |
| Pulse repetition frequency | DC to 1 MHz (external modulation, ALC off) | |
| External modulation | TTL level, positive logic, 50 Ω, BNC connector (front panel) | |
| Vector Modulation | Modulation frequency response | DC to 15 MHz (±2 dB bandwidth), DC to 30 MHz (±3 dB bandwidth). External modulation, input level: 0.5 V(rms), ≥100 MHz, ≤0 dBm, modulation frequency of 1 kHz |
| Vector error | ≤2.5% (rms) [External modulation, input level: 0.5 V(rms), ≥100 MHz, ≤0 dBm, 3.84 Msps QPSK modulation] | |
| Internal modulation | Requires digital modulation unit (option) | |
| External modulation | √(I² + Q²) = 0.5 V(rms), I/Q = ±1.5 V(peak), 50 Ω, BNC connector (front panel) | |
| Quadrature degree adjustment | Adjustment range: ≥±1 deg | |
| I/Q change | I, Q signal changeable (RF spectrum invert) | |
| Memory | Basic parameter memory | 512 sets of frequency and level |
| All parameter memory | All parameters including 100 sets maximum of analog modulation and digital modulation units (option) | |
| Sweep | Sweep parameter | Basic parameter memory address |
| Sweep pattern | Start address → stop address | |
| Sweep time | 1 ms to 600 s (per memory; memory recall time restricts lower limit, resolution: 1 ms) | |
| Sweep mode | Auto (repetition sweep), single (single sweep) | |
| Display | Size | 7.2 inch, 480 x 640 dots, color D-STN |
| On/off setting | Panel display on/off | |
| External Interface | GPIB | Remote control: All functions except power switch, local key, and contrast key. Interfaces: SH1, AH1, T5, L4, TE0, SR1, RL1, DP0, PP0, DC1, DT1, C1, E2. Connector: Rear panel |
| RS-232C | Async (start-stop), half-duplex. Baud rate: 1200, 2400, 4800, 9600, 19200, 38400 bps. Data bits: 7 or 8. Parity: Odd, even, none. Start bit: 1. Stop bit: 1 or 2. Connector: D-sub 9 pins, rear panel | |
| PC card | Memory card (memory backup, screen hard copy). Connector: JEIDA Ver 4/4.1 PCMCIA Rel 2.0, 1 slot (rear panel) | |
| Trigger | 3-bit TTL command input for frequency/level step up-down, memory recall up/down, output level on/off. Connector: D-sub 9-pin, female (rear panel) | |
| General | Reverse power protection | ≤50 W (≤1 GHz), ≤25 W (>1 GHz), ±50 V (DC) |
| Power | AC 100 to 120 / 200 to 240 V (-15/+10%, 250 V max, automatic selection), 47.5 to 63 Hz, ≤300 VA | |
| Temperature | Operating: 0° to 50°C, Storage: -20° to +60°C | |
| Dimensions and mass | 426 (W) x 177 (H) x 451 (D) mm, ≤25 kg (excluding option) | |
| Compliance | EMC: EN61326:1997/A2:2001 (Class A), EN61000-3-2:2000 (Class A), EN61326:1997/A2:2001 (Annex A); LVD: EN61010-1:2001 (Pollution Degree 2) |
Please review the Manufacturer's Data Sheet to verify published specifications. Feedback on this webpage is always welcome — please reach out to your Test Architect at any time for questions or concerns. Thank you, we truly appreciate you being our customer.
Model No
Anritsu
Condition
Used
Manufacturer
Anritsu
30+ Years in Business
Secure Payments
Sell Test Equipments
Knowledgeable Staff
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30+ Years in Business
Secure Payments
Sell Test Equipments
Knowledgeable Staff
On-site Lab
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