Gyroscope Amplifier

Discussion in 'The Projects Forum' started by jarkal, Oct 19, 2011.

  1. jarkal

    Thread Starter New Member

    Oct 19, 2011
    I'm trying to amplify the output of a gyroscope that feeds into a 10bit A/D for my micro. I need to be able to read down to .1 dps resolution. The gyroscope that I'm using is a 100dps gyro that has 2.5 mV/dps sensitivity. Calculating it out, I think I need a gain of ~13 in order for it to reach the resolution I need with a 10bit ADC.

    I can't for the life of me figure out the amplifier circuit. I've been working on it for hrs and going round and round.

    The gyro outputs a 1.5V zero rate level and also has a 1.5Vref. The amplifier I've been using is a LMC7111 powered by +3.3V.

    Can you guys help me? I've mostly done digital designs and coding so analogs are not my strong suit.

    Thanks in advance!
  2. gootee

    Senior Member

    Apr 24, 2007
    Go to and download application notes AN-20 and AN-31. Remember to use 0.1 uF ceramic and 10uF electrolytic caps in parallel to ground from each power pin of each IC.