What is the input to output latency for Laser Lock Box
Written by Paul Cracknell
Updated at October 27th, 2024
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The input-to-output latency depends on the low-pass filter bandwidth and the PID controller settings. The shortest latency is achieved by setting the low-pass filter to its highest cutoff frequency and using a faster controller. The table at the end provides reference points for input-to-output latency.
The delay can be verified using the Moku Frequency Response Analyzer or by injecting a known frequency tone with a 1 mHz modulation frequency to simulate a DC-like demodulation. Minimum delay can be observed by setting the low-pass filter’s corner frequency to 35.16 MHz to minimize its phase response impact and configuring the PID as a 0 dB Proportional controller to eliminate the effect of Integrator's phase response.
Under this configuration, the Laser Lock Box shows a 30-degree phase delay at approximately 228 kHz, attributed to internal digital signal processing. However, accounting for an additional analog input and output delay of around 300 ns, the 30-degree control bandwidth of the Laser Lock Box is approximately 108 kHz.
| Low-pass corner | 30° phase delay frequency | Latency |
| 1 MHz | ~55 kHz | ~1.5 μs (Fast controller) |
| 1 MHz | ~5 kHz | ~16.7 μs (Slow controller) |
| 100 kHz | ~16 kHz | ~5.2 μs (Fast controller) |
| 100 kHz | ~4 kHz | ~20 μs (Slow controller) |