Multi-Channel Programmable Current Source

Cryogenic Analog RF Module
November 15, 2017
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Developed for both semiconductor and digital superconductor electronics, the Multi-Channel Programmable Current Source is computer-controlled and features 48 low-noise current source outputs. Each source output has the capability to both set and read back currents and can be set to a zero-current high Z mute state.
Each of the 48 sources are optically coupled for control and are sourced from their own secondary winding for complete galvanic isolation. The device consumes a maximum of only 80 W and handles a maximum load current of 4.8 A total overall outputs. Operating over a range of 0-100 mA on each channel, the device features accuracy of +/-25 μA. The mute state can be set thru a rear panel interlock or from the front panel button for maximum circuit protection. The unit can be mounted in a standard-sized rack.
Features
  • 48 channels—all are completely independent and floating
  • Computer-controlled
  • Source code available for integrating the current source functionality into test software systems
  • Low noise
  • Designed for semiconductor and digital superconductor circuits
  • Unconditionally stable load impedance
  • Greater than 1 MΩ output resistance
  • Maximum circuit protection
Applications
  • Current source for digital superconductor circuits
  • Current source for semiconductor circuits
  • Low-noise circuits
  • Low-level signal instrumentation
  • Automation and control for current input devices (relays, BJT)
Source Code/Current Source Set-up

Source code/device setup can be delivered using a USB stick or pre-loaded using a computer over the USB port.

Accessories Available

Test leads, rack-mount brake-out panel for BNC connections

Construction
  • 19″ wide, 4″ high, 22″ deep (standard rack size)
  • 20 lbs
  • Power supply: 100-240 V, 50-60 Hz
  • Power consumption: 80 W (maximum)
  • Output power: 19.2 W
  • Hardwire interlock on rear panel
  • RoHS compliant
Specifications/ Performance
Accuracy +/-25 μA
Programming Resolution 50 μA (step size)
Noise 0.5 μA
Settling Time 1 mSec
Output Current 100 mA maximum
Program Response Time Approximately 50 uSec per point
Stability Unconditionally stable
Programming Input USB (version 1.1 or 2.0)
Output Resistance >1 MΩ
Output Capacitance < 400 pF
Load Impedance Unconditionally stable
Voltage Limit (Compliance) 4.5 V
Maximum Load Current 4.8 A
DUT Resistance 40 Ω @ 100 mA
Common Mode Voltage Floating (+/-20 V)
Floating Source Can be used in source or sink application
Output Connections Deutsch or DSUB 50