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AFG-2225 - 25MHz Arbitrary Function Generator

25MHz Arbitrary Function Generator

GW Instek

Category : Function Generators

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GW Instek is launching AFG-2225, its first basic level dual-channel arbitrary function generator, which provides superior features in its class. Both channels are equipped with same characteristics to fit dual-signal applications such as differential or IQ signaling. The outstanding cost-performance value makes the AFG-2225 a practical instrument to accelerate the development process.

The major features for both channels include 10Vpp output amplitude; 25MHz frequency bandwidth with 1uHz resolution; built-in waveforms of Sine, Square, Ramp (Triangle) and Noise. As to the 1%~99% adjustable duty cycle of Square waveform can be used as pulse signal sources. For the arbitrary waveform, user can edit the 66 built-in waveforms or create a whole new one. Moreover, AFG-2225 carries features of AM/FM/PM/FSK/SUM Modulation, Sweep, Burst and Frequency Counter, which can be applied to various communication fields.

In addition to the intuitive and friendly user interface, the 3.5-inch color LCD displays the comprehensive operation information including the true waveform presented at the output. USB Host and Device interfaces are equipped to link the AFG-2225 with other devices, which provide the flexibility of waveform generation for more practical usages. With link to GW Instek GDS-series Digital Storage Oscilloscopes (DSOs), the waveforms of interest can be captured and reconstructed. User can also use the arbitrary waveform PC software to edit the waveform and then send to AFG-2225 directly, or save the waveform into flash drive and then transfer to AFG-2225.

Frequency ranges from 1uHz to 25MHz, and offers multiple standard waveforms

AFG-2225 offers signal output by DDS technique. The maximum frequency is 25 MHz and offers full-range 1uHz frequency resolution. The built-in functions include Sine, Square, Ramp/Triangle, Pulse, and Noise.

Wide Frequency Range


Full-Functions equipped Dual-channel Signal Output Capability

In most two-channel signals applications, such as digital modulation and vehicle electronic simulation signals, the similar or identical waveform capabilities are required for both channel outputs. Unlike other dual-channel AFG in this class, AFG-2225 is fully equipped with equal capabilities on dual outputs. Most of dual-channel arbitrary waveform generators in this basic level cluster offer one major channel and one minor channel, in which the minor channel only provides less functions or inferior performances. This sort of non-full-function dual-channel AFGs can not meet the requirements of reality.

The equivalent function in dual-channel


Correlated Functions of Dual-channel Outputs

The two channels can be used in either independent or correlated configuration. AFG-2225 provides three correlated functions which are Couple, Tracking and Phase functions. For Couple function, two signals with a ratio or offset in amplitude or frequency can be generated. One of two signals with adjustable offset frequency is an example which can form the two-tone signals for testing the third order inter-modulation distortion of an amplifier. With Tracking function, two differential signals with equal-frequency, equal-amplitude but inverted phase can be produced. Examples such as PECL, LVPECL and LVDS digital signals or automotive sensors like temperature, speed signals are all able to be simulated by tracking function. The Phase function is designed to create two signals with specified phase offset. When user wants to create two quadrature (sine and cosine) signals, the phase offset is set to be 90 degrees in the Phase function. In conclusion, compared with other arbitrary function generators only equipped with phase function, AFG-2225 provides great convenience to fulfill the various challenges coming from modern electronic industries.

Coupling in dual-channel Operation


Differential Signals

Quadrature ( sine and cosine ) signals


High-flexibility of Arbitrary Waveforms Editing

AFG-2225 provides 120MSa/s sampling rate, 10-bit vertical resolution, 4k-point waveform length, and the maximum waveform repeated rate of 60MHz, regarded as an outstanding arbitrary waveform capability. There are four ways for AFG-2225 to generate customized arbitrary waveforms, which are editing waveform via PC software, point-by-point editing on the panel, loading CSV file and loading the captured waveform from GW Instek GDS-Series Oscilloscopes.

The PC software editing and point-by-point editing particularly provide the way to create the user-defined and post-modification waveform. CSV file loading capability allows AFG-2225 to produce the waveforms with complicated math operation result. For example the MSK (minimum shift keying) signaling in digital communication system needs integral operation. Engineer can use PC math software to process the integral and then send the results in CSV format to AFG-2225. With the link to GW Instek GDS-series Digital Storage Oscilloscopes (DSOs), the waveforms of interest can be captured by DSO and then reconstructed by AFG-2225. User can capture the waveform during the operation and then reconstructed by AFG-2225 for further analysis or diagnosis in the laboratory. Thus, plus the dual-channel feature, numerous derivative applications of capturing signal can be achieved.


Front Panel Operation


Supports CSV file upload


Direct Waveform Reconstruction (DWR) Capability


Arbitrary Waveform Editing PC Software


1%~99% Adjustable Duty Cycle of Square Wave

Inheriting the advantage of AFG-2000 Series, AFG-2225 provides a 1%~99% variable duty cycle for its Square waveform within 100kHz bandwidth, which is considered practical for the tests such as simulating pulse and transient signals without purchasing extra advanced function generator and pulse generator.


1% duty cycle of square setting


Friendly Operating Interfaces and Instant Parameter Display

AFG-2225 provides friendly panel operation setting as well as what You See Is What You Get operating way. From editing to output, the process can be manipulated via panel. Besides equipped with highly-flexible editing method, the immediate diagram is capable for users to understand the current waveform status and the output waveform contents under the storage/output setup.

More flexible of flexibility of arbitrary waveform storage and extraction


66 Built-in Arbitrary Waveforms

66 frequently used function waveforms in all fields are built in arbitrary waveform memory for user's selection. They are categorized into four groups, Common, Math, Window and Engineer. The trigonometric derivative functions, Blackman, Chebyshev, Bessel, Gamma, Gauss ... can be selected and developed by further editing.


66 kinds of Waveforms in 4 catalog


Support Multi-change Signal Application

AFG-2225 owns built-in functions, such as Modulation, Sweep, Burst, and RF Counter. The modulation waveforms contain AM, FM, PM, FSK, SUM, and either an internal signal or an external signal can be selected to perform the modulation. Sweep Function includes two sweep ways, linear and log mode, which can also perform sweep function in internal or external. Burst function supports two modes, Gate and N-Cycle, which can be used to control parameters such as phase angles, duration frequency, and duration time. The built-in Frequency Counter is available to provide the maximum 150MHz frequency range without additional purchase.

FSK Modulation, Sweep, and Burst Function


Impedance Switch Function

Majority of users are using oscilloscope to observe the waveforms of function generators. However, the differences of input impedance of function generators and oscilloscopes are not the same, and the oscilloscope will not necessarily be equipped with built-in input impedance switch function; the correct amplifier can only be received through computing. AFG-2225 provides 50Ω and high-input impedance switching modes, which can efficiently enhance the accuracy while users reading the results.

50Ω / High Z Impedance Switch Function


Provide USB Host/Device Interface

The USB Host/Device Interfaces are located at the rear panel of AFG-2225. The USB Host is mainly used for directly reconstruction of waveforms of GW Instek GDS-Series Oscilloscope, thus, it can be stored and recalled at portable USB Flash Drive; as to USB Device, which is used to connecting with PC, besides controlling through software on PC, USB Device also supports IEEE488.2 Command List for users to process customized functional control.

  • Wide Frequency Ranges From 1μHz to 25MHz (sine/square wave)
  • 1 μHz Resolution in Full Range
  • Built-in Standard 120MSa/s, 10bit, 4k Points Arbitrary Waveform for Both Channels
  • True Dual-Channel Output, CH2 Provides the Same Characteristics as CH1
  • Couple, Tracking, Phase Operations of Dual Channel are Supported
  • 1% ~ 99% Adjustable Duty Cycle for Square Waveform
  • High Resolution and Colored TFT LCD with Friendly User Interface
  • Multiple Editing methods to Edit Arbitrary Waveform Easily
  • Built-in Standard AM/FM/PM/FSK/SUM/Sweep/Burst and Frequency Counter
  • USB Host/Device Interface for Remote Control and Waveform Editing


The specifications apply when the function generator is powered on for at least 30 minutes under +18°C~+28°C. 


Sine, Square, Ramp, Pulse, Noise, ARB

Arbitrary Functions

Sample Rate 120 MSa/s
Repetition Rate 60 MHz
Waveform Length 4k points
Amplitude Resolution 10 bits
Non-Volatile Memory 4k points

Frequency Characteristics

Range Sine, Square 1uHz~25MHz
Ramp 1MHz
Resolution   1uHz
Accuracy Stability ±20 ppm
Aging ±1 ppm, per 1 year
Tolerance ≤1 mHz

Output Characteristics

Amplitude Range 1mVpp to 10 Vpp (into 50Ω)
2mVpp to 20 Vpp (open-circuit) 
1mVpp to 5 Vpp (into 50Ω) for 20MHz-25MHz
2mVpp to 10 Vpp (open-circuit) for 20MHz-25MHz
Accuracy ±2% of setting ±1 mVpp (at 1 kHz)
Resolution 1mV or 3 digits
Flatness ±1% (0.1dB) ≤100kHz
±3% (0.3 dB) ≤5MHz
±5% (0.4 dB) ≤12MHz
±10%(0.9dB) ≤25MHz
(sine wave relative to 1kHz)
Units Vpp, Vrms, dBm
Offset Range ±5 Vpk ac +dc (into 50Ω)
±10Vpk ac +dc (Open circuit) 
±2.5 Vpk ac +dc (into 50Ω) for 20MHz-25MHz
±5Vpk ac +dc (Open circuit) for 20MHz-25MHz
Accuracy 2% of setting + 10mV+ 0.5% of amplitude
Waveform Output Impedance 50Ω typical (fixed)
> 10MΩ (output disabled)
Protection Short-circuit protected
Overload relay automatically disables main output

Sine Wave Characteristics

Harmonic distortion ≤-55 dBc   DC ~ 200kHz, Ampl > 0.1Vpp
≤-50 dBc   200kHz ~ 1MHz, Ampl > 0.1Vpp
≤-35 dBc   1MHz ~ 5MHz, Ampl > 0.1Vpp
≤-30 dBc   5MHz ~ 25MHz, Ampl > 0.1Vpp

Square wave Characteristics

Rise/Fall Time ≤25ns at maximum output. (into 50 Ω load)
Overshoot 5%
Asymmetry 1% of period +5 ns
Variable Duty Cycle 1.0% to 99.0% ≤100kHz
10% to 90% ≤ 1MHz
50% ≤ 25MHz

Ramp Characteristics

Linearity < 0.1% of peak output
Variable Symmetry 0% to 100% (0.1% Resolution)

Pulse Characteristics

Period 40ns~2000s
Pulse Width 20ns~1999.9s
Overshoot <5%
Jitter 20ppm +10ns

AM Modulation

  Ch. 1 Ch. 2
Carrier Waveforms Sine, Square, Ramp, Pulse,Arb Sine, Square, Ramp, Pulse,Arb
Modulating Waveforms Sine, Square, Triangle,
Upramp, Dnramp
Sine, Square, Triangle,
Upramp, Dnramp
Modulating Frequency 2mHz to 20kHz (Int)
DC to 20kHz (Ext)
2mHz to 20kHz (Int)
DC to 20kHz (Ext)
Depth 0% to 120.0% 0% to 120.0%
Source Internal / External Internal / External

FM Modulation

  Ch. 1 Ch. 2
Carrier Waveforms Sine, Square, Ramp, Sine, Square, Ramp,
Modulating Waveforms Sine, Square, Triangle,
Upramp, Dnramp
Sine, Square, Triangle,
Upramp, Dnramp
Modulating Frequency 2mHz to 20kHz (Int)
DC to 20kHz (Ext)
2mHz to 20kHz (Int)
DC to 20kHz (Ext)
Peak Deviation DC to Max Frequency DC to Max Frequency
Source Internal / External Internal / External


  Ch. 1 Ch. 2
Waveforms Sine, Square, Ramp, Sine, Square, Ramp,
Type Linear or Logarithmic Linear or Logarithmic
Start/Stop Freq 1uHz to Max Frequency 1uHz to Max Frequency
Sweep Time 1ms to 500s 1ms to 500s
Source Internal / External/Manual Internal / External/Manual


  Ch. 1 Ch. 2
Carrier Waveforms Sine, Square, Ramp, Pulse Sine, Square, Ramp, Pulse
Modulating Waveforms 50% duty cycle square 50% duty cycle square
Modulation Rate 2mHz to 100 kHz (INT) 
DC to 100 kHz(EXT)
2mHz to 100 kHz (INT) 
DC to 100 kHz(EXT)
Frequency Range 1uHz to Max Frequency 1uHz to Max Frequency
Source Internal / External Internal / External


  Ch. 1 Ch. 2
Carrier Waveforms Sine, Square, Ramp Sine, Square, Ramp
Modulating Waveforms Sine, Square, Triangle,
Upramp, Dnramp
Sine, Square, Triangle,
Upramp, Dnramp
Modulation Frequency 2mHz to 20kHz (Int)
DC to 20kHz (Ext)
2mHz to 20kHz (Int)
DC to 20kHz (Ext)
Phase deviation 0˚ to 360˚ 0˚ to 360˚
Source Internal / External Internal / External


  Ch. 1 Ch. 2
Carrier Waveforms Sine, Square, Ramp, Pulse, Noise Sine, Square, Ramp, Pulse, Noise
Modulating Waveforms Sine, Square, Triangle,
Sine, Square, Triangle,
Modulation Frequency 2mHz to 20kHz (Int)
DC to 20kHz (Ext)
2mHz to 20kHz (Int)
DC to 20kHz (Ext)
SUM Depth 0% to 100.0% 0% to 100.0%
Source Internal / External Internal / External

External Trigger Input

Type For FSK, Burst, Sweep
Input Level TTL Compatibility
Slope Rising or Falling(Selectable)
Pulse Width >100ns
Input Impedance 10kΩ,DC coupled

External Modulation Input

Type For AM, FM, PM, SUM
Voltage Range ±5V full scale
Input Impedance 10kΩ
Frequency DC to 20kHz

Trigger Output

Type For Burst, Sweep, Arb
Level TTL Compatible into 50Ω
Pulse Width >450ns
Maximum Rate 1MHz
Fan-out ≥4 TTL Load
Impedance 50Ω Typical

Dual Channel Function

  Ch. 1 Ch. 2
Phase -180˚ ~180˚ -180˚ ~ 180˚
Synchronize phase Synchronize phase
Track CH2=CH1 CH1=CH2
Coupling Frequency(Ratio or Difference) Frequency(Ratio or Difference)
Amplitude & DC Offset Amplitude & DC Offset


  Ch. 1 Ch. 2
Waveforms Sine, Square, Ramp Sine, Square, Ramp
Frequency 1uHz~25MHz 1uHz~25MHz
Burst Count 1 to 65535 cycles or Infinite 1 to 65535 cycles or Infinite
Start/Stop Phase -360 to +360 -360 to +360
Internal Period 1ms to 500s 1ms to 500s
Gate Source External Trigger External Trigger
Trigger Source Single, External or Internal Rate Single, External or Internal Rate
N-Cycle, Infinite 0s to 655350ns 0s to 655350ns

Frequency Counter

Range 5Hz to 150MHz
Accuracy Time Base accuracy±1count
Time Base ±20ppm (23˚C ±5˚C) after 30 minutes warm up
Resolution The maximum resolution is:
100nHz for 1Hz, 0.1Hz for 100MHz.
Input Impedance 1kΩ/1pf
Sensitivity 35mVrms ~ 30Vms (5Hz to 150MHz)


10 Groups of Setting Memories


USB (Host & Device)



General Specifications

Power Source AC100~240V, 50~60Hz
Power Consumption 25 W (Max)
Operating Environment Temperature to satisfy the specification :  18 ~ 28˚C
Operating temperature :
0 ~ 40˚C
Relative Humidity:
< 80%, 0 ~ 40˚C
Installation category: CAT II
Operating Altitude 2000 Meters
Storage Temperature -10~70˚C, Humidity: ≤70%
Dimensions (WxHxD) 266(W) x 107(H) x 293(D) mm
Weight Approx. 2.5kg
Accessories GTL-101× 2
Quick Start Guide ×1
CD (user manual + software) ×1 
Power cord×1

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