Frequency Problem
Problem Freq1P02

Name__________________________

        You have a very slowly varying temperature signal that can be considered to have all frequency components below 1Hz.  That temperature signal is measured with a sensor that is susceptible to 60Hz noise (from the power line).  Here are the salient facts.

• At room temperature, the temperature sensor has an output of around 0.3v.
• The 60Hz signal has a peak amplitude of 0.1v.
• An RC filter is suggested as shown below.
• The capacitor is 1.0mf.
• Determine R so that the 60Hz noise is reduced to .01v.

• Determine how much a 1Hz signal will be affected in your design.