Technical data
One of the most sophisticated features of LinearAmp is its Low Pass Filter. This
circuit is an 8-pole, Bessel-type filter with linear phase response. This special, high
quality Low Pass Filter is necessary to realize the anti-aliasing function, which is
indispensable before the analogue to digital conversion.
In the LinearAmp the High Pass Filter, the Low Pass Filter, and the Gain have got 8
possible positions. The actual values, realized during the manufacturing process can
be ordered with the default parameters, but they can be requested with special
values, to meet any special requirements, as well. The default values for the Filter
and Gain sections are listed below. Any combination of the parameters can be
selected; even the invalid settings (for instance, if the High Pass Filter is set to higher
frequency, than the Low Pass Filter). The invalid settings result no faults in the
equipment, only the output voltage will be driven to zero.
High Pass Filter settings:
DC (0 Hz)
0.16 Hz (1 s)
0.53 Hz (0.3 s)
1.6 Hz (0.1 s)
5.3 Hz (0.03 s)
10 Hz
30 Hz
100 Hz
Low Pass Filter settings:
100 Hz
200 Hz
500 Hz
1 kHz
2 kHz
5 kHz
10 kHz
20 kHz
Gain settings:
0.5
1
2
5
10
20
50
100
The Notch Filter (hum noise filter) of the LinearAmp is tuned to 50 Hz (or optionally to
60 Hz). The Notch Filter can be switched on and off in the software running on the
