Pendulum Instruments · Dual-Channel High-Voltage Linear Amplifiers
A400D
Two channels in one enclosure, fixed ×20 gain, ±200 V wideband high-voltage linear amplifier
The A400D puts two A400 amplifiers in one enclosure: ×20 gain per channel, ±200 V bipolar, 150 mA, DC to 1 MHz bandwidth at 100 Vpp, with both channels sharing ground and supply. Against the ±150 V of the F20AD it adds 50 V of swing, enough to drive a 200 V rated piezo stack to its full range. It suits two-axis long-travel positioning, synchronized drive of two elements, and setups that need two 200 V class outputs in limited rack space. If you need a larger swing across one load rather than two independent channels, look at the A400DI with its built-in phase inverter.
Overview
Before choosing a dual-channel model, settle one question: do you need two independent 200 V outputs, or one larger swing? The two needs look alike and lead to different answers. The A400D serves the first: two separately controlled ±200 V channels for a two-axis stage or two elements driven on their own. The channels share ground and supply, so the common-mode relationship is fixed, and in two-axis positioning that goes straight into trajectory accuracy. Each channel matches the single-channel A400: ×20 gain takes a standard ±10 V source to full swing, 150 mA output current, DC coupling for absolute position control, and DC to 1 MHz bandwidth at 100 Vpp. If what you really need is 400 Vpp or more across one load, the A400DI is the better choice: its phase inverter lets the two channels drive one floating load in counter-phase for up to 800 Vpp, without buying an amplifier with twice the output voltage.
Key specifications
| Channels | 2 (two independent A400 amplifiers, shared ground and supply) |
|---|---|
| Fixed gain | ×20 |
| Output voltage range | −200 V to +200 V (bipolar) |
| Output current | 150 mA (with current-limit protection) |
| Bandwidth (100 Vpp output) | DC to 1 MHz |
| Bandwidth (maximum Vpp output) | DC to 500 kHz |
| Slew rate | 400 V/µs |
| Input voltage range | ±10 V maximum (recommended working range ±7.5 V) |
| Input impedance | 1 MΩ (30 pF) |
| Output impedance | <0.1 Ω |
| Power supply | 100/110 V or 220/230 V, 50/60 Hz |
| Dimensions (W × H × D) | 257 × 102 × 262 mm, weight 4 kg |
Features
Two independent ±200 V channels
A two-axis stage or two separately controlled elements, each driven on its own.
Full coverage of 200 V class devices
50 V more than a ±150 V model, so a 200 V rated piezo stack needs no derating.
Fixed common-mode relationship
Shared ground and supply keep two-axis trajectory accuracy clear of potential differences between instruments.
×20 and 150 mA per channel
Same ratings as the single-channel A400, so the signal chain stays as it is.
Need more swing? See the DI
For 800 Vpp across one load, the counter-phase topology of the A400DI is the right answer.
General high-voltage drive
Piezo actuators, MEMS, OLED, liquid crystal, and any R&D or production test setup that needs two high-voltage signals.
Typical applications
Piezo actuation
Driving piezo actuators and nanopositioning systems
Piezo actuators need linear high-voltage signals in the ±200 V class yet are very sensitive to noise and nonlinearity. Feeding a low-amplitude arbitrary waveform generator (±10 V) into the A400D gives an accurate ×20 high-voltage drive for optical scanning stages, ultrasonic transducers and closed-loop positioning tables, without buying a dedicated piezo controller.
Device characterization
Electrical characterization of MEMS, OLED and liquid-crystal devices
MEMS sensors, OLED pixels and LC light modulators are measured for I-V behavior, switching speed and dielectric properties with wideband (DC to 1 MHz) high-voltage signals during development. The two independent A400D outputs apply different high-voltage biases to two electrode sets of the device at once; with an oscilloscope or impedance analyzer that completes the electrical characterization.
Differential high-voltage output
Differential push-pull drive of electro-optic modulators and LC cells
Electro-optic modulators and LC cells want symmetric differential high-voltage drive to reject common-mode interference and raise signal-to-noise ratio. With both A400D channels on one ground reference, engineers feed the same source to both channels and invert one of them, producing an effective ±400 V peak-to-peak push-pull output without buying a higher-rated single-channel amplifier.
Options and configuration
Tick the options you need; we collect them into a configuration list and carry it into the quotation form.
Standard equipment (included)
Model selection
Calibration service options
Downloads
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