Anfatec Instruments AG
Measurement Science and Technology &
Scanning Probe Microscopy

Controller Front Panel

Anfatec's ultimate High-Speed Controlling System

Anfatec's brand-new SPM controller development integrates cutting-edge D/A- and A/D-conversion technology into a unique state-of-the-art multiple DSP system. The digital real-time feedback loop provides an outstanding performance with ~1 µs latency in contact and dynamic mode. A synchronized digital scan generator with programmable output filtering guarantees an absolutely jitter free image. Intelligent data acquisition features allow to eliminate image non-linearities caused by the user's mechanical system. ( Example Video's )

list prices starting from 35.000 Euro

Schematics of the controller

Controller Rear Panel
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 (show details)
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 1 MHz oscillation and 2 MHz oscillation)
Versatile - every signal can be used as input signal
- DAC output and input signals can be inverted independently
Feedback Modes 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
Standard ADC/DAC 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
Scan Generator
Scan Modes 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.

Channels choose between three channels for stack scanners and five channels for tube scanners
Output Voltages 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
Technical Parameters 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:

Slip-Stick Movements 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
Stepper Motors 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.
DC Motors 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.