The Keysight (Agilent) 54754A is a high-performance 18-GHz differential TDR/TDT sampling module designed for use with Infiniium DCA, DCA-J, and legacy Agilent digitizing oscilloscope mainframes. It features two channels with built-in TDR step generators that can operate independently or in tandem for differential or common-mode stimulus-response measurements. When the TDR generators are disabled, the module functions as a high-bandwidth vertical acquisition system.
Specifications
General
| Parameter | Value |
|---|---|
| Interfaces | Internal mainframe plug-in interface |
| Display | None (utilizes host mainframe display) |
| Warm-up Time | 1 hour |
| Calibration Cycle | 1 year |
Physical
| Parameter | Value |
|---|---|
| Power Supply | Powered by host mainframe |
| Operating Temperature | 10 °C to 40 °C |
Vertical System
| Parameter | Value |
|---|---|
| Channels | 2 |
| Electrical Bandwidth | 18 GHz / 12.4 GHz (user-selectable) |
| Calculated Rise Time (10% to 90%) | 19.4 ps (at 18 GHz), 28.2 ps (at 12.4 GHz) |
| RMS Noise (Typical) | 0.25 mV (at 12.4 GHz BW), 0.5 mV (at 18 GHz BW) |
| RMS Noise (Maximum) | 0.5 mV (at 12.4 GHz BW), 1.0 mV (at 18 GHz BW) |
| Maximum Input Signal | ±2 Vdc |
| Nominal Input Impedance | 50 Ω |
TDR/TDT Step Generator
| Parameter | Value |
|---|---|
| Number of TDR Pulser Channels | 2 |
Host Mainframe Integration
| Parameter | Value |
|---|---|
| Slot Occupancy | 1 slot |
Measurement Capabilities
| Parameter | Value |
|---|---|
| Measurement Modes | TDR (Time Domain Reflectometry), TDT (Time Domain Transmission) |
| Impedance Measurements | Ohms (Ω) |
| Edge Speed Control | User-selectable normalized rise time filter |
Inputs & Outputs
| Parameter | Value |
|---|---|
| Maximum Safe Input Voltage | ±2 V (DC + peak AC) or +16 dBm |
Performance
| Parameter | Value |
|---|---|
| Input Dynamic Range | ±400 mV relative to channel offset |
| Offset Range | ±500 mV |
| Channel-to-Channel Isolation | ≥ 60 dB (DC to 12.4 GHz), ≥ 50 dB (12.4 GHz to 18 GHz) |
| TDR System Reflected Rise Time (10% to 90%) | ≤ 45 ps |
TDR Performance
| Parameter | Value |
|---|---|
| Step Source Impedance | 50 Ω nominal |
Technology
Time-Domain Reflectometry (TDR) & Sampling Oscilloscopy
Applications
Differential and common-mode TDR/TDT testing, high-speed digital interconnect analysis, impedance characterization, and S-parameter measurements.