2105 gradient amplifier and power supply


150 Volts
50 Amps

The 2105 is a high-power, DC-enabled linear amplifier and integrated power supply that offers a wide bandwidth and exceptional control of drift and distortion. The 2105 functions as a voltage or current source and operates using single-phase power, making it ideal for use in the lab or classroom. Its linear design provides a very-low noise floor and fast current rise times. Because the 2105 has no ripple noise, no synching with the console is required.

The AE Techron brand is known throughout the world for its robust, low-noise gradient amplifiers as well as its product service and support.


2105 Pulsed Output

Pulse testing performed with unit operated in Controlled-Current mode with a load equal to 500 µH + 100 mΩ and at 25°C ambient temperature.

Output (±A Peak)


DC* 500 / 500 100 / 100 10 / 20 170 / 1000 25 / 1000 4 / 100
16 8.75 9 11.7 25 49 55

*DC 1Ω


  • Output of 50 amperes peak, 150 volts.
  • 4-quadrant linear design.
  • Blanking feature lowers the noise floor on the amplifier by shutting down the output stage. This action occurs in less than 10 µs.
  • Current mode response: DC-5 kHz (compensation dependent); Voltage mode response: DC-20 kHz at rated power.
  • Efficient design and light-weight chassis materials allow amplifier to occupy only 2U height and weigh only 41 lbs.
  • Robust, linear power supply results in extremely low noise; bi-level switch design limits heat dissipation to output devices.
  • Provides precision control of output offset, DC drift and gain linearity.
  • Protection circuitry guards against input overloads, improper output connection (including shorted and improper loads), over-temperature, over-current, and supply voltages that are too high or low.
  • Shipped ready to operate from 120-volt (±10%) single-phase AC mains; 220/240-volt model available on request.


Specification typical at 25°C ambient. Unless otherwise noted, testing was done in Current mode with a load = 500 µH + 100 mΩ.

Peak Current Limit: 55A

Gain (adjustable):
  Voltage Mode: 20 to 0.2 V/V
  Current Mode: 5 to 0.2 A/V

Gain Linearity* (over input signal, from 0.2V to 5V):
  AC: 0.05%

Output Offset (adjustable to zero):
  Voltage Mode:
Less than ±400 µV
  Current Mode: ±5 mA

Input Characteristics:
  Three-Terminal Barrier Block Connector:
Balanced with ground; 20 kΩ differential
  BNC Connector: Unbalanced; 10 kΩ single ended
  Max Input Voltage: ±10 V balanced or unbalanced
  Common Mode Rejection: -58 dB with 5V input

Output Impedance,
  Current Mode (effective):
  Voltage Mode (typical): 28 mOhms in series with 1 µH

  Current Mode:
200 µH + 100 mΩ
  Adaptable Range: 5 µH to 2.5H; 0.01Ω to 20Ω

Current Mode Response: -3 dB at 10 kHz (compensation dependent)

Current Settling Time, Ramp 0A to ±50A or ±50A to 0A:
  20 µs to within 1.0A or 1%
  35 µs to within 200 mA or 0.2%

Total Harmonic Distortion:
  Current Mode:
Less than 0.1%
  Load: 500 µH + 100 mΩ

Noise Floor (when Blanking circuit is enabled): 5 µA or less

DC Drift: Self Heating Drift, 0 to ±60 A: 5 mA/10 minutes maximum

Noise Output:
  10 Hz to 1 kHz:
0.2 mA
  1 kHz to 60 kHz: 0.05 mA

Ripple Noise Output: None

Slew Rate, Voltage Mode: 23 V/µs

Remote Control and Monitoring (back-panel D connector):
  Current Monitor:
±1V / 5A ±1%   Reporting: System Fault, Over Temp, Over Voltage, Over Load   Control: Force to Standby, Remove from Standby, Reset after a fault

Amplifier Protection:
  Over Load/Distortion (IOC):
Shutdown or temporary fault
  Current vs Time (ODEP): Shutdown or temporary fault
  Each heat sink temperature: Shutdown 105°C
  Overvoltage Shutdown: 132 VAC / 253 VAC
  Undervoltage Shutdown: 108 VAC / 207 VAC

Display, Control, Status, I/O

Status Indicators (front panel): LEDs indicate a status of Run, Ready or Standby, and Fault, Over Temp, Over Voltage, and Over Load conditions

Controls (front panel):
  Soft Touch Switches:
Run, Stop and Reset functions
  Gain Control, when enabled: Voltage gain adjustable from 20 to 0; Current gain adjustable from 5 to 0
  On/Off and Breaker: Two-position power switch also functions as a breaker

Connectors (back panel)
  Power Connection:
25 Amp IEC (with retention latch)
  Signal Output: OUTPUT / COM / Chassis Ground. Resistor istalled between COM and Chassis Ground terminals is a 2.7-ohm, 2W, 5% metal-oxide resistor.
  Signal Input: User-selectable unbalanced BNC or balanced Barrier Strip
  Interlock I/O Connection: 25-pin D connector provides for remote monitoring and control functions

Power Requirements: Single phase, 120 VAC, 60 Hz, 20 Amp service; (220-240 VAC, 50-60 Hz, 10 Amp service model available)

Thermal Requirements:
  Operating Temperature:
+10°C to +30°C (+50°F to +86°F)
  Storage: –30°C to +85°C (–22°F to +185°F)
  Humidity: 70% or less, non-condensing

Physical Characteristics:
19" L x 3.5" H x 22.75" D (48.3 cm L x 8.9 cm H x 57.8 cm D)
  Cooling: Forced air cooling from front to back through removable filters.
  Airflow: 180CFM
  Weight: 41 lbs (18.6 kg)
  Shipping Weight: 51 lbs (23.2 kg)