Gen 2 Performance & Measurements

This section contains comprehensive performance measurements and specifications for Red Pitaya Gen 2 boards’ fast analog inputs and outputs.

Note

Test Conditions:

  • Tested Board: STEMlab 125-14 PRO Z7020 Gen 2

  • Applicability: All STEMlab 125-14 Gen 2 boards share the same analog frontend specifications

  • Environmental conditions: Laboratory environment with controlled temperature (25°C ± 1°C) and humidity (45% ± 5%)

  • Calibration: Factory calibration applied


Quick Reference

Fast Analog Input Performance

Parameter

LV Mode (±1 V)

HV Mode (±20 V)

Bandwidth (-3 dB)

52.02 MHz

52.77 MHz

Bandwidth flatness

<0.05 dB (DC to full BW)

-

Crosstalk (up to 30 MHz)

>70 dB

40-55 dB

Input coupling

DC

DC

Input impedance

1 MΩ ‖ 10 pF

1 MΩ ‖ 10 pF

Fast Analog Output Performance

Parameter

50 Ω Load

High-Z Load

Voltage range

±1 V

±2 V

Bandwidth (-3 dB)

54.3 MHz

55.0 MHz

Bandwidth flatness

Within -1 dB (DC to full BW)

Within -1 dB (DC to full BW)

Output impedance

50 Ω (crisp, clean)

-

SFDR (typical)

44-58 dB (frequency dependent)

-

Detailed Measurements


Gen 2 Improvements Over Original Generation

Key analog frontend improvements:

  • Reduced noise and crosstalk - Cleaner signals with better channel isolation

  • Enhanced output range - ±2 V @ Hi-Z load vs ±1 V on original boards

  • Crisp 50 Ω output impedance - Better matching for RF applications

  • Improved SFDR - Higher spurious-free dynamic range

  • No power-on glitching - Outputs remain stable during boot (hardware-disabled until FPGA loads)

For complete comparison, see What’s different in Gen 2?.