Data Sheet
20 MHz DDS Sweep Function Generator
with Arb Function
Model 4045B
Features & Benefits
12-bit, 50 MSa/s, 1k point arbitrary waveform
The model 4045B is a high-performance
20 MHz DDS (direct digital synthesis) function
generator with arbitrary waveform capability.
Generating stable and precise sine, square,
triangle, and arbitrary waveforms, this instrument
provides variable output voltages from 0 to 10
Vpp into 50 Ω (up to 20 Vpp into open circuit),
linear and logarithmic sweep, AM/FM modulation,
a built-in counter, and a continuously variable DC
offset that allows the output to be injected directly
into circuits at the correct bias level. Separate
output amplitude and DC offset amplifiers let you
set a large DC offset (e.g. ± 4.99 V ) with a
small amplitude output signal (e.g. 10 mV), a
feature typically found in more expensive
The 4045B combines a traditional DDS and a
true arbitrary generator in one unit, giving users
the benefits of both technologies. Using DDS
technology, waveforms can be generated with high
frequency resolution at a low price. Due to the
inherent limitations of this architecture, not all
points from the waveform memory are used, and
points may be skipped at higher frequencies. This
leads to significantly more jitter and higher
Technical data subject to change
© B&K Precision Corp. 2013
distortions on non-repetitive waveforms and
sometimes small details of the waveforms stored
internally will be missing from the output signal.
The true arbitrary waveform section generates
point by point waveforms with lower jitter, high
resolution, and true representation of the
required waveform.
Sine and square waveforms up to 20 MHz
Triangle/ramp waveforms up to 2 MHz
Bright color display with waveform preview
Linear and logarithmic sweep
AM/FM modulation
Independent output and DC offset amplifiers
allow for small amplitude output signals with
Due to the arbitrary waveform capability of
the 4045B, the instrument is able to generate
low-jitter square waves with greater edge
stability. The improved signal integrity allows
these generators to be used for simulating
reliable clock signals, generating triggers, or
validating serial data buses.
This model is suitable for education and other
applications that require DDS function
generators with sweep, modulation, and arbitrary
waveform capabilities.
large DC offsets
Low-jitter square wave generation
Adjustable duty cycle
Output ON/OFF button
Internal/external triggering
Gate and burst mode
Built-in counter
USB interface
SCPI-compliant command set
Arbitrary waveform editing software and
remote control application software provided
Short circuit and overvoltage protection on all
inputs and outputs
20 MHz DDS Sweep Function Generator with Arb Function
Model 4045B
Front panel
Rear panel
Color LCD
Menu function
Numeric On/Off
waveform keys keypad button control knob
sweep key
Utility Sync
key output output
Modulation input
Trigger/counter input connector
USB interface
Intuitive user interface
Easily change all waveform parameters using the intuitive menu-driven front panel keypad, rotary control knob, and large color LCD display that shows a preview of
the output waveform. Convenient waveform and range selection buttons let users make quick and precise adjustments to the output signal.
Versatile tools
Easy PC connectivity
Generate waveforms with ease
The 4045B provides AM and FM modulation
along with linear/logarithmic sweep and built-in
counter capabilities. Internal and external sources
can be used for triggering and modulating the
The signal generator can be programmed
remotely via the USB (virtual COM) interface
using SCPI commands. B&K Precision also offers
application software (available for download at that provides virtual front
panel emulation, allowing users to remotely
control their instrument without the need for
Use waveform editing software to easily generate,
edit, and download custom arbitrary waveforms.
Generate waveforms by importing a text file, or
define via freehand, point draw, or waveform
math. Waveforms can also be loaded from the
generator for documentation purposes.
20 MHz DDS Sweep Function Generator with Arb Function
Model 4045B
Modulation Characteristics
Frequency Characteristics
0.01 Hz to 20 MHz
Amplitude Modulation
0.01 Hz to 20 MHz
0.1 Hz – 20 kHz sine, square, or triangle waveform
0.01 Hz to 2 MHz
5 Vp-p for 100% modulation, 10 kΩ input impedance
6 digits* or 10 mHz
0.001% (10 ppm)
at < 500 Hz: 0.001% + 0.006 Hz
Output Characteristics
Amplitude Range
10 mVpp to 10 Vpp (into 50 Ω);
20 mVpp to 20 Vpp (open circuit)
Amplitude Resolution
Frequency Modulation
0.1 Hz – 20 kHz sine, square, or triangle waveform
5 Vp-p for 100% modulation, 10 kΩ input impedance
Sweep Characteristics
Sweep Shape
Linear or Logarithmic, up or down
3 digits (1,000 counts)
Sweep Time
10 ms to 100 s
Amplitude Accuracy
± 2% ± 20 mV of programmed output from 1.01 V – 10 V
Input and Output
± 0.5 dB to 1 MHz
± 1 dB to 20 MHz
DC Offset Range
-4.99 V to 4.99 V (into 50 Ω)
DC Offset Resolution
10 mV, 3 digits
DC Offset Accuracy
± 2% ± 10 mV (into 50 Ω)
Output Impedance
50 Ω ± 2%
Output Protection
Protected against short circuit or accidental
voltage applied to the main output connector
Waveform Characteristics
Harmonic Distortion
(for sine wave at
5 Vp-p into 50 Ω)
0 – 1 MHz, < -60 dBc
1 MHz – 5 MHz, <-50 dBc
5 MHz – 12 MHz, <-45 dBc
12 MHz – 20 MHz, <-60 dBc
Square Rise/Fall Time
≤ 20 ns (10% to 90% at full amplitude into 50 Ω)
Duty Cycle
Square: 20% - 80% to 2 MHz
Triangle: 1% - 99% in 1% steps, up to 200 kHz
Symmetry Accuracy
at 50%
± 1%
Jitter (square)
< 100 ps rms (cycle-to-cycle, typical)
Arbitrary Waveform Characteristics
Sampling Rate
20 ns to 50 s
Vertical Resolution
12 bits
Trigger IN
TTL compatible
Maximum rate 1 MHz
Input impedance 1 kΩ
Minimum width > 50 ns
Sync OUT
TTL pulse at programmed frequency; 50 Ω source impedance
Modulation IN
5 Vp-p for 100% modulation
10 kΩ input impedance
DC to > 20 kHz minimum bandwidth
Counter Characteristics
50 Hz to 50 MHz
Auto ranging, up to 8 digits
± 0.02% ± 2 digits
25 mVrms typical
Memory Storage
20 instrument settings
Arbitrary Memory
1,000 points in flash memory
Power Requirements
100 V – 240 V AC ± 10%, 47-63 Hz
32 °F to 122 °F (0 °C to 50 °C)
Storage Temperature
14 °F to 158 °F (-10 °C to 70 °C)
95% R.H. 0 °C to 30 °C
(W x H x D)
8.39” x 3.46” x 8.27” (213 x 88 x 210 mm)
4 digits
5.5 lbs (2.5 kg)
Waveform Length
2 to 1000 points
Meets EMC Directive 2004/108/EC, EN55011, EN55082
Meets Low Voltage Directive 2006/95/EC, EN61010
Operating Modes
Output continuous at programmed parameters
Output quiescent until triggered by an internal or external trigger,
at which time one waveform cycle is generated to programmed
parameters. Frequency of waveform cycle is limited to 1 MHz.
Same as triggered mode, except waveform is executed for the
duration of the gate signal. The last cycle started is completed.
2-65535 cycles
Trigger Source
Trigger source may be internal, external, or manual. Internal
trigger rate 0.1 Hz – 1 MHz (1 us – 10 s)
Three-Year Warranty
Included Accessories
Instruction manual on CD, power cord, USB (type A to B)
interface cable, certificate of calibration
Note: All specifications apply to the unit after a temperature stabilization time of 15
minutes over an ambient temperature range of 23 ºC ± 5 ºC.
Specifications are subject to change without notice.
*For square wave, resolution is up to 4 digits when frequency is > 20 kHz.
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