The Keithley 4225-PMU Ultra-Fast Pulse Measure Unit is a high-speed semiconductor characterization instrument that generates fast voltage waveforms while simultaneously measuring current and voltage with nanosecond-level timing precision. It integrates pulsed sourcing with transient waveform capture, enabling accurate analysis of non-volatile memory, CMOS devices, and compound semiconductors without self-heating artifacts.
Technical Specifications
Sourcing and Measurement
• 2 independent voltage sources per module
• Measurement speed up to 200 MSa/s
• 14-bit ADCs per channel
• Voltage source ranges: ±10 V into 1 MΩ and ±40 V (80 V peak-to-peak)
• Slew rate up to 1 V/ns
• Rise/fall times as short as 100 ns
• Pulse widths from 60 ns to 999 ms and DC capability
• Programmable pulse offset voltage for non-zero baseline measurements
Current Measurement
• Standard ranges: ±800 mA, ±10 mA, 100 µA, 200 mA, 800 mA
• With optional 4225-RPM module: 100 nA to 10 mA in six ranges
• Current measurement resolution (4225-RPM): <200 pA without averaging
• Noise floor (4225-RPM): ~10 pA
• Direct measurement resolution: ~10 nA without averaging
Waveform Generation and Timing
• Segment ARB™ with up to 2048 user-defined segments
• Programmable segments as short as 20 ns
• Segment looping up to 10¹² cycles
• Pulse periods from 120 ns to 1 s
• Internal synchronization <3 ns between multiple modules
Electrical Characteristics
• Output resistance: 50 Ω
– Key Features
• Synchronized pulsed I-V and transient I-V measurements in single instrument
• Ultra-fast 1 V/ns slew rate with nanosecond-scale pulse control
• Flexible arbitrary waveform generation with multi-level segment capability
• Picoamp-level current sensitivity with optional remote preamplifier
• Self-heating minimization for accurate fast-switching device characterization
– Typical Applications
• Non-volatile memory (NVM) pulse characterization and reliability testing
• CMOS transistor transient response analysis
• Compound semiconductor device pulsed measurements
• Rapid device recovery and settling-time evaluation
– Compatibility & Integration
The 4225-PMU operates as a modular plug-in for the Keithley 4200A-SCS Parameter Analyzer system, extending its capabilities with dedicated ultra-fast pulse sourcing and measurement. Optional 4225-RPM remote preamplifier extends current measurement sensitivity to 100 nA minimum range.
