RHD Recording System

Intan RHD recording system

The Intan RHD recording system is a modular, low-cost electrophysiology data acquisition system built around the Intan RHD family of microchips.

Hardware

You need three basic components to assemble a functional electrophysiology recording system:

  • RHD recording headstage. These are small circuit boards containing an Intan RHD amplifier chip that amplify, filter, and digitize signals from 16, 32, 64, or 128 electrodes. Unlike traditional headstages that provide limited analog amplification, Intan headstages perform all amplification on the headstage and produce a digital data stream conveying the signals from all electrodes.
  • RHD recording controller or RHD USB interface board. This acts as a digital hub that links one or more headstages to a computer via a standard USB port. The RHD recording controller supports up to 1024 amplifier channels in a rack-mountable case with robust digital and analog I/O ports. The RHD USB interface board is sold as an open circuit board and can stream up to 256 amplifier channels to a host computer at user-selectable sampling rates up to 30 kS/s per channel. A detailed comparison of these two controllers may be found here.
  • SPI interface cable. These cables link the headstages to the recording controller or USB interface board, sending power to the headstage and data back to the controller. They come in 1-ft (0.3 meter), 3-ft (0.9 meter), and 6-ft (1.8 meter) lengths, and in two thicknesses: standard and ultra thin. Multiple cables can be daisy-chained to create longer cables.

Software

Intan provides free software to operate this system. The software allows users to select amplifier bandwidths and sampling rates, measure electrode impedances, view live signals from electrodes, and save data to disk. Recording sessions may be controlled manually or triggered automatically by external digital signals. We also provide free software to load saved data files into MATLAB, Python, or Julia, or to convert data files to NEX format.

We provide compiled, ready-to-run software for Windows PCs or Macs. You can download it and try it out before you buy Intan hardware; it will run in demo mode. We provide open-source C++/Qt source code that can be compiled for Linux.

Electrodes

Intan does not manufacture or sell electrodes, but many third-party companies sell electrodes that are compatible with our headstages. A list of compatible electrodes is provided with each RHD headstage.

Commutators

Many of our customers use our system with commutators (i.e., slip rings or swivels). We do not sell commutators, but we do provide an application note describing how to adapt our SPI interface cables to any basic commutator. Also, Intan-ready motorized commutators with optical fiber ports are available from Alpha Omega (AlphaComm-I) and Doric (commutator with Intan adapter). Since our interface cables use purely digital signals, operation with commutators is typically robust and free of movement-induced noise.

Wireless

Intan Technologies does not manufacture or sell any devices with wireless telemetry, but several third-party companies have developed wireless electrophysiology products and data loggers using Intan RHD amplifier chips, including:

 

Documents and Software