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LFP Filter Main Amplifier

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LFP Filter Main Amplifier

The TREC Local Field Potential Filter/Amplifier (LFP) is a multichannel, differential input main filter/amplifier for neurophysiological applications (e.g. extracellular recording with multiple microelectrodes). This LFP-Filter/Amplifier combines a band pass filter with variable cut-off frequencies and variable signal amplification on each channel in one instrument.

Key features:

  • 8 amplifier channels
  • Low-noise amplifier technique
  • Differential input amplifier
  • Individual gain settings from x50 up to x5000 (in different steps)
  • bandwidth 0.1 Hz … 140 Hz (in different high pass filter steps)
  • AC coupled input circuit
  • Low noise technique
  • Integrated power supply
  • BNC Input and output
Technical Data
Dimensions and Weight 
Length (mm)330 mm
Width (mm)450 mm
Height (mm)150 mm
Weight (kg)9 kg
Power Supply 
Supply voltage (V):100-240V AC
Power consumption (W):30VA
Environmental conditions 
Operating temperature range:+10°C to +40°C
Transport temperature range:+10°C to +40°C
Humidity:20% – 80% RH (non-condensing)
Input data 
Max. Filter input voltage:±6V
Single Unit Activity (SUA) Bandpass Filter/Amplifier: 
Gain:50, 100, 250, 500, 1000, 2500, 5000
Input impedance:1M?//30pF
Low Pass cut-off [kHz]:140 (fixed)
High Pass cut off [Hz]:0.1, 1, 10,20
Filter Characteristic:Butterworth
Input Connector:BNC
Output Connector:BNC
Max. Output voltage swing:±10V

The LFP-Filter/Amplifier contains a high-gain, low-noise differential amplifier stage followed by low frequency and high-frequency filters. The amplifier has a differential Local Field Potential (LFP) bandpass filter–amplifier. The amplifier offers two levels of signal gain (x10, x100) in a first stage and 4 additional levels (x5, x10, x25 and x50) in a final amplifier stage (see Figure 2).

Figure 1: 8 channel Local Field Potential Filter/Amplifier (LFP-08)

The amplifier has a band pass characteristic for Local Field Potentials (LFP) 0,1Hz…140Hz. The high pass cut-off frequencies are independently selectable 0.1 , 1 , 10 and 20Hz for low pass filter the cut off frequency is fixed at 140Hz.

Figure 2: Block diagram of one LFP-filter/amplifier section

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