2105: Up to 50 Ap/150 Vp, Voltage or Current Source, Single-Phase



Single-phase, 2U, gradient amplifier plus integrated power supply

  • Four-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.
  • 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.

Key Performance Capabilities:

  • Up to 50 Ap, 150 Vp
  • Current-mode response: DC-5 kHz (compensation dependent); Voltage-mode response: DC-20 kHz at rated power.
  • Noise Floor (when Blanking circuit is enabled): 5 µA or less
  • Current Settling Time on ramp of 0A to ±50A or ±50A to 0A: 20 µs to within 1.0A or 1%; 35 µs to within 200 mA or 0.2%

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.

Soft-clip Option: When the end user of an MRI system has the ability to adjust current rise time and level, the MRI console can require voltage and/or current that is beyond the amplifier's ability to produce. Under those conditions, the Soft-clip Option provides a smooth transition into and out of this clipped condition. This, in turn, permits useable images to be created even when operating at or beyond the capabilities of the gradient amplifier.

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


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.   *DC 1Ω.

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

Front & Back

2105 front panel
2105 back panel



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 µV (0.95 mV)
   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
Output Impedance,
   Current Mode (effective):
   Voltage Mode (typical): 28 mΩ in series with 1 µH
   Current Mode:
500 µH + 100 µΩ
   Adaptable Range: 5 µH to 1.5 H, 0.01Ω to 20Ω
Current Mode Response: −3 dB at 5 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): 4 µA or less
DC Drift, Self Heating Drift, 0 to ±60A: 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

Input Characteristics

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

Status Display, Control, I/O

Status Indicators (front panel): LEDs indicate a status of Run, Ready, or Standby, and Fault, Over Temp, Over Voltage, and Overload conditions
Controls (front panel),
   Soft-touch Switches:
Run (Enable), Stop and Reset functions
   Gain Control, when enabled: Voltage gain adjustable from 20 to 0; Current gain adjustable from 5 to 0
   On/Off Breaker: Two-position power switch also functions as a breaker; turn off and then on to reset
Connectors (back panel),
   Power Connection:
25-amp IEC (with retention latch)
    Signal Output: Three-position terminal strip (OUTPUT/COM/CHASSIS GROUND); resistor installed between COM and CHASSIS GROUND terminals is a 2.7-ohm, 2W, 5% metal-oxide resistor
    Signal Input: User-selectable BNC or Barrier Strip, balanced or unbalanced
   Interlock I/O Connection: 25-pin D connector provides for remote monitoring and control functions

Remote Control and Monitoring

(via back-panel D connector)

Current Monitor: 5A/V ± 1%; 2.5A/V ± 1% (differential configuration)
Reporting: System Fault, Over Temp, Over Voltage, Over Load
Control: Blanking control, Force to Standby, Remove from Standby, Reset after a fault

Amplifier Protection

Over Load/Distortion (IOC): Shutdown or clipped output
Current vs. Time (ODEP): Clipped output
Each heat-sink temperature: Shutdown 105°C
Overvoltage Shutdown: 132 VAC / 253 VAC
Undervoltage Shutdown: 108 VAC / 207 VAC

Operation Requirements

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

Dimensions: 19”L x 22.75”D x 3.5”H (48.3 cm L x 57.8 cm D x 8.9 cm H)
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)


2105 Datasheet

Complete technical specifications

2105 Operator's Manual

For 2105 amplifiers

Multiamp Configuration Guide

For 2100- and 7000-series amplifiers

SIM Pinouts and Functions

For 2105, 2110 and 2120 amplifiers

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