Arbitrary Waveform Generator (AWG) Fundamentals¶
AWGs provide flexible signal generation for validation scenarios that standard pattern generators cannot address. This guide covers arbitrary waveform generators for custom stimulus, stressed signal creation, and advanced testing applications.
Overview¶
Modern high-speed validation often requires signals that go beyond standard patterns:
- Custom waveforms for specific test scenarios
- Stressed signals with controlled impairments
- Multi-channel synchronized stimulus
- Real-world waveform playback from captured data
This guide covers AWG programming and application for generating exactly the signals your validation requires.
Key Topics¶
AWG Selection & Specification¶
Learn to choose the right AWG for your applications:
- Sample rate and bandwidth requirements
- Vertical resolution and dynamic range
- Memory depth for waveform storage
- Channel count and synchronization needs
Waveform Development¶
Master custom waveform creation:
- Mathematical waveform synthesis
- Impairment injection (jitter, noise, distortion)
- Protocol-compliant pattern generation
- Real-world waveform reconstruction
System Integration¶
Understand AWG integration into validation environments:
- Multi-channel synchronization
- Trigger and sequencing configuration
- Remote control and automation
- Marker output for timing reference
Signal Conditioning¶
Learn to optimize AWG outputs:
- Output filtering for spectral shaping
- Amplification for required signal levels
- DC offset and common-mode adjustment
- Cable and fixture compensation
Applications in HSIO Validation¶
Stressed Signal Generation¶
- Jitter injection (sinusoidal, random, bounded)
- Noise addition (Gaussian, colored)
- ISI emulation through waveform shaping
- Voltage margin variation
Clock Generation¶
- Spread spectrum clock synthesis
- Clock jitter injection
- Multi-phase clock generation
- Frequency margining signals
Protocol Emulation¶
- Custom training sequences
- Error injection for recovery testing
- Specific pattern generation
- State machine stimulus
Key Specifications¶
| Parameter | Description |
|---|---|
| Sample Rate | Maximum output update rate (GS/s) |
| Bandwidth | Analog -3dB bandwidth |
| Vertical Resolution | DAC bits (10-16 typical) |
| Memory Depth | Waveform storage per channel |
| SFDR | Spurious-free dynamic range |
Waveform Creation Approaches¶
Mathematical Synthesis¶
- Sine, square, triangle, pulse waveforms
- Modulated signals (AM, FM, PM)
- Multi-tone combinations
- Chirp and swept frequency
Impairment Injection¶
- Add jitter to ideal waveforms
- Inject noise with controlled distribution
- Apply bandwidth limitation
- Create stressed eye patterns
Brands & Models¶
Keysight Technologies¶
- M8190A - 12 GSa/s, 14-bit precision AWG
- M8195A - 65 GSa/s, 8-bit high-speed AWG
- M8199A/B - 128/256 GSa/s ultra-high-speed
Tektronix¶
- AWG70000B Series - Up to 50 GSa/s, 10-bit
- AWG5200 Series - 16-bit high-resolution
When standard signal generators are not enough, understanding AWG capabilities enables creation of exactly the waveforms needed for comprehensive validation.