RHK has developed a series of state-of-theart multi-gain preamplifiers specifically designed for optimum low-noise STM performance. The IVP series of preamplifiers provides a unique combination of low noise with wide bandwidth operation. Furthermore, these amplifiers exhibit an extremely flat frequency response over the entire bandwidth and provide uncommonly stable operation over a wide range of operating conditions (including input capacitance of up to 100pf).

The preamplifiers are two-stage devices providing optimum performance at a wide range of operating parameters. Each first stage preamplifier is equipped with RHK’s unique I/V converter design and provides a fixed gain stage amplifier. The second stage provides an additional pin programmable gain stage with a selectable low pass filter. A series of first stage models provides gains from 10⁷ (UHV only) to 10⁹, including a model designed for operation in vacuum for UHV applications.

• Compact design with simple BNC connection (on atmosphere models) for easy interface to any scan head design
  
  
• UHV-compatible design for minimal signal loss and input circuit capacitance
  
  
• Pin programmable gain
  
  
• Pin programmable low pass filters
  
  
• Pin programmable signal input – inverted
  or non-inverted