AWG20 – 20 Bit / 2 MS/s Arbitrary Waveform Generator

DC to 20kHz spectrum, 1KHz carrier, 1.2kHz filter-on

The AWG20 is a 20 bit Arbitrary Waveform Generator for medium-speed / high resolution waveform generation. The module combines an excellent dynamic performance with a very high DC accuracy.
The module features differential outputs with a programmable common-mode voltage. For single ended applications the positive output as well as the negative output can be used. There are 8 filter paths available, 4 of them can be user configured.
The module has 8 output ranges starting at 80mVpp up to 10.24Vpp, which covers a wide range of Unit Under Test input voltages.

A filter-bank with 4 Low Pass filters (1.2kHz, 12kHz, 40kHz, and 200kHz) provide excellent signal conditioning to obtain the best possible signal integrity. In addition there are 4 software selectable signal paths available for user defined filters.
The Module uses a combination of multiple DACs, sub-ranging and error correction to achieve a full 20 bit performance level. The result is an excellent SNR, THD, linearity and step response, making it very suitable for sine wave generation, ultra linear ramp generation and fast stepping signals. With 4M-word (12M-byte) of memory very complex signal shapes can be generated.
All these features ensure a very accurate result when performing analog measurements. The unit is very suitable for testing ADCs on linearity and dynamic performance.

Block Diagram

AWG20 – 20 Bit / 2 MS/s Arbitrary Waveform Generator

Key Features

  • 2 MHz maximum sample speed
  • 20 bit resolution
  • Differential outputs
  • 8 output ranges
  • Selectable filters to improve signal quality
  • THD: -118 dB @ 1kHz (typ. with 1.2 kHz filter)
  • SNR: 95 dB typical (DC - 800 kHz)
  • Programmable common mode voltage
  • For ATX series hardware platform

Technical Specifications

General

Resolution 20 bit
Update rate DC - 2MHz
Pattern depth 4M words

Output characteristics

Output impedance 50 Ohm or low impedance (<1 Ohm)
Ranges Single Ended (Vpp) 80 mV, 0.16 V, 0.32 V, 0.64 V, 1.28 V, 2.56 V, 5.12 V, 10.24 V
Ranges differential (Vpp) 0.16 V, 0.32 V, 0.64 V, 1.28 V, 2.56 V, 5.12 V, 10.24 V, 20.48 V
Output filters (4 pole Butterw.) Bypass, 1.2 kHz, 12 kHz, 40 kHz, 200 kHz, plus 4 user signal paths
Bandwidth, -3 dB (typical) 500 kHz (5.12 Vpp range)
0.1 dB flatness (typical) 150kHz (5.12 Vpp range)
Output configuration Differential, Single Ended, 50 Ohm
Output operating range +/- 10.24 V

Accuracy (filter bypass)

Absolute accuracy ±(40 µV + 10 ppm of range)
Non Linearity ±8 ppm of range (4 ppm typical)
Temperature drift (typical) ±(1 ppm of range + 2 ppm of value)/°C

Common mode voltage source

Resolution 20 Bit (10 µV)
Voltage range -5.12 V to +5.12 V
DC-offset accuracy ±(20 µV + 8 ppm of value)
Non Linearity ±10 ppm of range

Dynamic characteristics

(5 Vpp output signal, 1.67 MS/s, BW DC-800 kHz)

SNR (1 kHz) 92 dB
SNR (10 kHz) 91 dB
SNR (100 kHz) 88 dB
SNR (1 kHz input, A-weighted) 104 dB (BW 20 Hz - 20 kHz)
THD (1 kHz) -108 dB
THD (1 kHz with 1.2 kHz filter) -115 dB
THD (10 kHz) -106 dB
THD (100 kHz) -83 dB
THD (100 kHz 2 Vpp) -90 dB (typical)
SFDR (1 kHz) 108 dB

Clock & Trigger inputs

Input impedance > 1 MOhm
Threshold level 3.3 V CMOS/TTL (5 V tolerant)