A800DI
Dual Channel High Voltage Linear Amplifiers
- Category: Dual Channel High Voltage Linear Amplifiers
- Manufacturer: Pendulum Instruments
- Output voltage (single channel): ±400 V
- Differential output voltage (two channels, floating load): up to 1600 Vpp
- Fixed voltage gain: 100×
- Output current (continuous): 60 mA
- Data sheet: Download PDF
- External link: Official product page
Overview
The Pendulum Instruments A800DI dual-channel high voltage amplifier with phase inverter consists of two entirely independent A800 linear amplifiers sharing a common ground reference and power supply, compact in design yet complete in function. The built-in low voltage phase inverter inverts the signal applied to the channel 1 input and, over the short BNC cable supplied, feeds it to the channel 2 input, so that in a differential configuration the two outputs stand 180° apart and the differential peak-to-peak voltage reaches 1600 Vpp. The amplifier is ultra-linear, with a frequency response covering DC to 1 MHz (at 100 Vpp) and DC to 300 kHz at maximum output voltage, and an output impedance below 0.1 ohm for steady, accurate drive into both resistive and small capacitive loads. The input accepts any signal source within ±4 V (input impedance 1 MΩ ∥ 30 pF) and works directly with a function generator or arbitrary waveform generator, so it is widely used wherever precise high voltage drive is needed: piezo actuators, MEMS sensors, OLED displays, liquid crystal devices and high voltage test laboratories.
Key features
- Differential output up to 1600 Vpp — With the two channel outputs in counter-phase and the load connected floating between them, the differential voltage reaches 1600 Vpp, extending the usable amplitude range considerably.
- Built-in 180° phase inverter — An integrated low voltage phase inverter shifts the channel 1 input signal by 180° automatically and feeds it to channel 2 over a BNC cable — simple to operate, with no external components needed.
- Ultra-linear broadband design — Frequency response covers DC to 1 MHz (at 100 Vpp) with a slew rate of 500 V/µs, suited to the precise high voltage reproduction of sine, square and arbitrary waveforms.
- Fixed gain of 100, with good input compatibility — A fixed gain of 100× accepting input signals within ±4 V connects directly to a function generator or arbitrary waveform generator, with no extra pre-stage adjustment.
- Low output impedance for accurate capacitive drive — An output impedance below 0.1 Ω supports capacitive loads up to 200 pF across the full bandwidth, suiting highly capacitive devices such as piezo actuators, MEMS and liquid crystal cells.
- Two independent channels on one stable supply — The two A800 amplifier circuits operate entirely independently while sharing a common ground and supply reference, keeping the channels consistent with each other and simplifying system integration and wiring.
Typical applications
- Drive testing of piezo actuators and ultrasonic transducers — When developing piezo actuators — nanopositioning stages, ultrasonic probes, fuel injection valves — an R&D engineer has to amplify the low voltage signal of a function generator (±4 V) accurately to a high voltage drive level. The A800DI outputs up to ±400 V at a gain of 100, and its low-harmonic-distortion linear architecture reproduces arbitrary waveforms faithfully from DC to 1 MHz, so the displacement-versus-voltage characteristic of a piezo device is measured without error.
- Extending the effective voltage amplitude by counter-phase dual-channel drive — When a device test needs an excitation amplitude beyond a single channel's ±400 V, the engineer uses the A800DI's built-in low voltage phase inverter to invert the CH1 input and send it to the CH2 input, putting the two channel outputs 180° apart; bridging a floating load — a liquid crystal cell, a MEMS electrostatic actuator, an OLED drive electrode — across the two outputs gives an effective differential voltage of up to ±800 V (1600 Vpp), greatly extending the range over which high voltage material and device characteristics can be assessed.
- Measuring the pull-in voltage characteristic of MEMS electrostatic actuators — Academic and industrial laboratories characterising the electromechanical behaviour of MEMS comb drives and cantilever resonators need a high voltage source able to output broadband, high-accuracy bias waveforms. The A800DI accepts the output of an arbitrary waveform generator and drives an electrostatic actuator linearly over a DC to 1 MHz sweep, measuring the pull-in voltage threshold, the shift in resonant frequency and the hysteresis curve — a dependable excitation signal for design verification.
Key specifications
Key specifications for A800DI, as published by Pendulum Instruments. For the full datasheet or a customized configuration, please get in touch.
| Output voltage (single channel) | ±400 V |
|---|---|
| Differential output voltage (two channels, floating load) | up to 1600 Vpp |
| Fixed voltage gain | 100× |
| Output current (continuous) | 60 mA |
| Input voltage range (nominal) | ±4 V |
| Input impedance | 1 MΩ ∥ 30 pF |
| Output impedance | <0.1 Ω (linear mode) |
| Bandwidth | DC to 1 MHz (at 100 Vpp); DC to 300 kHz (at max. Vpp) |
| Slew rate | 500 V/µs |
| Channels | 2 (phase inverter included) |
| Maximum capacitive load (full bandwidth) | 200 pF |
Frequently asked questions
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