LFP Filter Main Amplifier
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
| 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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