Anfatec Instruments 社は最新式のハイスピー ド SPMコントローラーを開発し、最先端の D/A・A/D 変換技術を独自のマルチDSPシステムに統合いたしました。デジタルリアルタイムフィードバックループによりコンタクトモードとダイナミックモードの両方で待ち時間が1μs 以下という目覚ましい性能が実現し、出力が プログラム可能な同期デジタルスキャンジェネレータによりジッターのない画像が保証されます。また、高度なデータ収集機能により、ユーザの装置に起因する画像の非線形性の問題も解決されます。 （Example Video’s） Schematics of the controller
Fast Z Feedback Loop
Fast Input ADC
> 500 MHz Sampling rate, 16 Bit resolution at 20 MHz band width
single channel input – dc and amplitude detection possible
Fast DAC Output
Low noise, ultra-fast output DAC with more than 18 bit resolution
Digital Feedback Type
PI-Control with self-adjustment of the feedback parameters 32 bit internal signal width, 40 MHz internal feedback loop
Dynamic Mode Specials
Anfatec provides a unique synchronous filtering that offers an optimized high speed
in dependence on the cantilevers resonance frequency.
(show details for 1MHz oscillation and 2MHz oscillation)
– every signal can be used as input signal
– DAC output and input signals can be inverted independently
The software offers seven different feedback types ranging from linear STM feedback over AFM contact and dynamic mode to PLL feedback
Low Voltage Signals
Input / Output Range (all channels)
-10 V to 10 V / BNC connectors
8 channels ADC and 8 channels DAC
24 Bit resolution at 156 kHz sampling rate
DAC-noise: 200 nV (show details), ADC-noise: < 0.3 mV
standard scan mode with conventional overscan (program generated)
fast-scan mode with specialized output filtering (FPGA generated)
Fast Scan Mode
real-time, autonomous scan generator implemented in an independent FPGA
2nd order low pass filtered outputs on the standard DAC’s
user-defined Line-Sync and Image-Sync offsets available (improves image linearity)
maximum pixel rate: > 1 MHz
system load checking -> safe operation
Standard Scan Mode
linear ramp output with parabolic overscan in standard scan mode maximum pixel rate: 40 kHz
High Voltage Amplifiers
Anfatec’s controllers usually are designed for the customers special experimental set-up. The integrated High-Voltage Amplifier is a very usefull option, because it allows us to adapt them to your piezo scanner in bandwidth, output voltage, and the amount of required channels. The numbers given in the table below are possible values out of whom the user should select what is required for his application.
choose between three channels for stack scanners and five channels for tube scanners
symmetric or unsymmetric to zero with up to ± 250 V
e.g. -10 V to 150 V, -200 V to 200 V or differential output -70 V to 70 V
Bandwidth in Z: 1 MHz (show spectrum R(f) or Phi(f))
Amplification and output noise depend on the type of HV amplifier.
Typical output noise: < 500 nV/sqrt(Hz). (show spectrum)
Coarse Positioning Options Great variety, most flexible solutions
Similar to the HV amplifier, the coarse movement is a unique solution in each microscope. We offer various integrated solutions that enable automated tip approach and user defined sample or tip movement with a cordless joystick. Let’s explain some of the options:
Define a ramp height and required rise and fall times for the fast and the slow ramp in connection with the capacitance to be driven – we’ll design the electrical parameters with reference to your requirements
Up to three 2-phase stepper motors can be operated either in “Level-Station mode” or as X-Y-Z movement. Here, we adapt the drive current to your request.
We provide pulse width modulation outputs for dc motor operation. The set-up provided through our engineers includes that the moved distance is calibrated at your system.
Third party coarse move systems
Tables produced by other providers and operated through USB or serial connection (e.g. the Agilis station from Newport) can be implemented in the software so that they operate as if they were part of the system.