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N8241A Arbitrary Waveform Generator Synthetic Instrument Module 1.25 GS/s or 625 MS/s Technical Overview
– 15 bits of vertical resolution per channel and either 1.25 Gigasamples per second (GS/s) or 625 Megasamples per second (MS/s) provides exceptionally realistic wideband waveforms – Dual output channels drive both single-ended and balanced designs without the need for baluns or hybrids. – Extended waveform memory and advanced sequencing engine offers long scenario simulations. – Multiple module synchronization provides multi-emitter simulations – Multiple programmatic interfaces enable easy integration into existing test environments – Fully compliant to LXI Class A standards Introduction
frequency agile communication systems. Figure 1. Generate wideband waveforms with unprecedented signal fidelity. from the DAC outputs or single-ended through multiple signal- conditioning paths. channel can outputwaveforms as an IF or as a baseband signal for I/Q up conversion.
- Keysight E8267D PSG signal generator with Option 016, wideband differential external I/O inputs.
played is not known in advance.
4 G signals, such as multiple input, and
multiple output formats (MIMO). Figure 7. Create signals where the next waveform to be played is not known in advance. Figure 8. Define signals by carrier frequency and modulation – instant by instant.
1.25 GS/s sample rate (Option 125) 625 MS/s sample rate (Option 062)
Figure 9. Excellent harmonic and spurious performance are available across the full Figure 10. Spurious performance outstanding at low signal frequencies.
08 | Keysight | N8241A Arbitrary Waveform Generator - Technical Overview Key Characteristics (continued) Sample clock Internal Fixed 1.25 GS/s (Option 125) Fixed 625 MS/s (Option 062) Internal clock output +3 dBm, nominal External clock input Tunable 100 MS/s to 1.25 GS/s (Option 125) Tunable 100 MS/s to 625 MS/s (Option 062) External clock input drive level +5 to -15 dBm, typical Phase noise characteristics 1 kHz: -95 dBc/Hz 10 kHz: -115 dBc/Hz 100 kHz: -138 dBc/Hz
1 MHz: -150 dBc/Hz
Accuracy Same as 10 MHz timebase input Frequency reference Input drive level +2 to +12 dBm into 50 Ω (+2 dBm, nominal) Waveform length 8 MS per channel (16 MS with Option 016) Minimum waveform length 128 samples Waveform granularity 8 samples Segments 1 to 32 k unique segments can be defined consisting of waveform start and stop address repetitions, and marker enable flags. Segment loops A total of 1 million (2 20) loops can be defined for each segment. Loops can be configured to advance in one of four modes: – Single: The segment loop plays once and waits at the end of the loop for a trigger. – Continuous: Segment loop is repeated continuously until a trigger is received. – Auto: Automatically advances to the next segment after completing the specified number of loop repetitions. – Repeat: The waveform loop repeats until the number of waveform loop repetitions is met. Sequences Up to 32 k total unique waveform sequences can be defined. A sequence is a contiguous series of waveform segments. Advanced sequencing Enables users to build and playback scenarios, which are comprised of one or more sequences. Scenarios 1 to 16 k pointers can be assigned to play pre-defined sequences. Sequence play begins with the first sequence entry and continues uninterrupted until the last entry is played. The table repeats until stopped. Sequence jump modes Sequence jumps determine how a sequence responds to a jump trigger. There are no discontinuities in a sequence jump other than those imposed by the waveform data. Three modes are available to control sequence jumps:• – Jump immediate: Jumps immediately to the next specified sequence address with a fixed latency. – End of waveform: The current segment (including waveform repeats) is completed before jumping to a new sequence. – End of sequence: The current sequence is completed before jumping to a new sequence. Jump latency is the longer of either the jump immediate latency or the length of the remaining sequence.
09 | Keysight | N8241A Arbitrary Waveform Generator - Technical Overview Key Characteristics (continued) Dynamic sequencing (Option 300) Input 20-pin mini-D connector A logic high must be within the window of +2.0 to +2.8 volts. Number of address bits 13 bits per channel Total number of addressable scenarios 16 k Data rate for dynamic data 100 ns Data latency Same as front panel trigger inputs. Software pointers may also be used to point to pre-defined scenarios, though latencies are not deterministic. Direct digital synthesis (Option 330) Output frequency resolution 1 Hz Frequency modulation Deviation from 0 to 125 MHz (250 MHz peak-peak) Phase modulation Deviation from –180 to +180 degrees in 0.022 degree steps Amplitude modulation Modulation depth from 0 to 100% with 15 bit resolution Single channel bandwidth 400 MHz (800 MHz I/Q) External triggers Number of inputs 8 each (4 SMB female front-panel connectors plus four software triggers over the LXI interface from host processor) Trigger polarity Negative/positive Trigger impedance 2 k ohms Maximum input level ±4.5 volts Input sensitivity 250 mV Trigger threshold –4.3 volts to +4.3 volts Trigger timing resolution Clock/8 (6.4 ns at 1.25 GS/s rate) (Option 125) Clock/8 (12.8 ns at 625 MS/s rate) (Option 062) Trigger latency 34 x clock/8 (217.6 ns at 1.25 GS/s rate) (Option 125) 34 x clock/8 (435.2 ns at 625 MS/s rate) (Option 062) Trigger uncertainty < 50 ps Minimum trigger width 12.8 ns at 1.25 GS/s clock rate (Option 125) 25.6 ns at 625 MS/s clock rate (Option 062) Trigger delay Programmable from 1 to 256 sync clock cycles with 1 sync clock cycle resolution 1 LXI triggering modes 2 Driver command based A driver interface on the controlling computer is used to directly transmit a command to the module. Direct LAN messaging A data packet containing triggering information (including a time stamp) is sent directly from one module to another via the LAN. Time based events An IEEE 1588 based time trigger is set and executed internally in a module. LXI trigger bus-based A module function is triggered via a voltage on the LXI trigger bus. 1. A sync clock cycle is clock/8 2. The LXI triggering conforms to the specifications of the LXI standard, revision 1.0, www.lxistandards.org
10 | Keysight | N8241A Arbitrary Waveform Generator - Technical Overview Key Characteristics (continued) External markers Markers Can be defined for each waveform segment Number of outputs 4 each SMB female Marker polarity Negative, positive Output impedance 50 ohms Marker low level 100 mV nominal into high impedance load Marker high level 3.2 volts nominal into high impedance load Marker timing resolution Clock/8 (6.4 ns at 1.25 GS/s rate) (Option 125) Clock/8 (42.8 ns at 625 MS/s rate) (Option 062) Marker lstency Marker precedes analog output and is adjustable in 2 sample clock period steps. Marker latency repeatability <100 ps Marker width Programmable from 1 to 256 sync clock cycles 1 Marker delay Programmable from 8 to 502 sample clock cycles, with 2 sample clock cycle resolution LXI markers Two LXI markers are available Module synchronization Supports system scaling for any number of N8241A modules. A single module can support a fan-out of 8 N8241A modules for precise triggering and repeatability. Driver boards may be used to scale any number of modules. Sync clock output level 800 mV p-p (50 ohms, AC coupled) Sync clock input sensitivity 100 mV p-p minimum into 50 ohms AC coupled Analog output Output connector SMA female Output impedance 50 ohms Analog output levels Single-ended Differential The following output levels are specified into 50 ohms Passive mode 0.5 Vp-p N/A Active mode 1 Vp-p with ±0.2 V offset N/A Direct DAC mode N/A 1 Vp-p (0 volt offset) Uncorrected passband flatness ±1 dB DC - 200 MHz; ±2.5 dB DC - 500 MHz (with 1.25 GHz clock) Uncorrected passband group delay ±500 ps DC - 200 MHz; ±1 ns DC - 500 MHz (with 1.25 GHz clock) Reconstruction filters 500 MHz and 250 MHz realized as 7-pole Cauer Chebychev filters plus thru-line output Pulse response Rise time (10 to 90%): < 1 ns Fall time (10 to 90%): < 1 ns Amplitude: 0.5 Vp-p 1. A sync clock cycle is clock/8
11 | Keysight | N8241A Arbitrary Waveform Generator - Technical Overview General Characteristics LXI Class A Certified Power Line power 100/120/220/240 VAC, 50/60 Hz, 100 watts maximum Environmental Samples of this product have been type tested in accordance with the Keysight Environmental Test Manual and verified to be robust against the environ - mental stresses of storage, transportation, and end-use; those stresses include, but are not limited to temperature, humidity, shock vibration, altitude, and power line conditions. Test methods are aligned with IEC 60068-2 and levels are similar to MIL-PRF-28800F Class 3. Operating temperature 0 to +50 degrees C (0 to 47 degrees C at 15,000 ft altitude) Storage temperature –40 to +70 degrees C Relative humidity Type tested 0 to 95% at 40 degrees C (non-condensing) Altitude 0 to 4500 m (15,000 ft) above sea level Weight 5.66 kg (12.5 lb) Security All user data stored in volatile memory Dimensions Height 89 mm (3.5 inch) Width 213 mm (8.375 inch) Depth 422 mm (16.625 inch) Calibration cycle 1 year warranty, platform calibration not required ISO compliance This instrument is manufactured in an ISO-9001 registered facility in concurrence with Keysight Technologies, Inc. commitment to quality. Electrostatic Discharge Immunity – IEC 61000-4-2: passes criterion C Testing according to IEC 61000-4-2: showed that the exposure of the data port to electrostatic discharge may interrupt operation of the N8241A/42A. Operation can be restored by reloading the desired waveforms and restarting. This required operator intervention results in a criterion C classification.
12 | Keysight | N8241A Arbitrary Waveform Generator - Technical Overview
Ordering Information
N8241A 15-bit arbitrary waveform generator with
8 MS memory per channel
N8241A-125 1.25 GS/s sample rate N8241A-062 625 MS/s sample rate N8241A-016 Waveform memory expansion to 16 MS per channel N8241A-300 Enabling software for 16-bit dynamic sequencing N8241A-330 Direct digital synthesis software Web Resources Visit our web sites for additional product information and literature. N8241A 15-bit arbitrary waveform generator: www.keysight.com/find/synthetic N6030A Series of arbitrary waveform generators: www.keysight.com/find/awg Signal simulation systems: www.keysight.com/find/ signalsimulation Aerospace and defense test and measurement products and services: www.keysight.com/find/ad Test and measurement accessories: www.keysight.com/find/accessories Figure 11. Keysight N8241A 15-bit arbitrary waveform generator LXI module
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