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AWG20: 20 bit Arbitrary Waveform Generator
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AWG20
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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.
DC to 20kHz spectrum, 1KHz carrier, 1.2kHz filter-on
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
Specifications
conditions: after 1 hour warm-up, TA=25°C, filter bypass unless otherwise mentioned
General
| Resolution | 20 bit |
| Update rate | DC - 2MHz |
| Pattern depth | 4M words |
Output characteristics
| Output impedance | 50Ω or low impedance (<1Ω) |
| Ranges Single Ended (Vpp) | 80mV, 0.16V, 0.32V, 0.64V, 1.28V, 2.56V, 5.12V, 10.24V |
| Ranges differential (Vpp) | 0.16V, 0.32V, 0.64V, 1.28V, 2.56V, 5.12V, 10.24V, 20.48V |
| Output filters (4 pole Butterw.) | Bypass, 1.2kHz, 12kHz, 40kHz, 200kHz, plus 4 user signal paths |
| Bandwidth, -3dB (typical) | 500kHz (5.12Vpp range) |
| 0.1dB flatness (typical) | 150kHz (5.12Vpp range) |
| Output configuration | Differential, Single Ended, 50Ω |
| Output operating range | +/- 10.24V |
Accuracy (filter bypass)
| Absolute accuracy | ±(40μV + 10ppm of range) |
| Non Linearity | ±8ppm of range (4ppm typical) |
| Temperature drift (typical) | ±(1ppm of range + 2ppm of value)/°C |
Common mode voltage source
| Resolution | 20-bit (10μV) |
| Voltage range | -5.12V to +5.12V |
| DC-offset accuracy | ±(20μV + 8ppm of value) |
| Non Linearity | ±10ppm of range |
Dynamic characteristics
(5Vpp output signal, 1.67Msps, BW DC-800kHz)
| SNR (1kHz) | 92dB |
| SNR (10kHz) | 91dB |
| SNR (100kHz) | 88dB |
| SNR (1kHz input, A-weighted) | 104dB (BW 20Hz - 20kHz) |
| THD (1kHz) | -108dB |
| THD (1kHz with 1.2kHz filter) | -115dB |
| THD (10kHz) | -106dB |
| THD (100kHz) | -83dB |
| THD (100kHz typical@2Vpp) | -90dB |
| SFDR (1kHz) | 108 dB |
Clock & Trigger inputs
| Input impedance | > 1MΩ |
| Threshold level | 3.3V CMOS/TTL (5V tolerant) |