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Information about the PCB

This section just contains some basic information about how the PCB should be assembled, ask your supervisor for more information

Decoupling caps

On the VDD and reference voltages four capacitors are connected in parallel to the ground. This acts a low pass filter and a charge reservoir which lowers the noise on these lines. From the chip and out there is first three 0805 capactiors with 100 pF, 1 nF and 1 uF in that order, then there is one larger 1206 capactior with 10 uF. The reason for this order is that smaller caps, in terms of capacitance, filter out higher frequencies that larger and smaller caps, in terms of size, usually have a lower series resistance.

Bias current

The bias currents are generated by having a resistance in series with a voltage source, in your case VDD, where the resistance is a variable resistance, or potentiometer, so it can be varied. It also have capacitors connected in parallel to ground to reduce the noise and ripple.


Page responsible: Martin Nielsen-Lönn
Last updated: 2014-09-12