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TLC2254: Popcorn Noise

Kuramochi Tadahiko
Guru 28715 points
Part Number: TLC2254
Other Parts Discussed in Thread: OPA188

Hi,

The TLC2254 doesn't output the popcorn noise because it is manufactured by CMOS process.

Is it correct?

Best Regards,

Kuramochi

  • 0
    Expert 2580 points

    NO.

    You only can overcome popcorn noise e.g. 1/f noise using chopper techniques. See OPA188, for instance.

    With best regards

    Gerhard

  • 0 in reply to Gerhard Kreuzer
    TI__Guru 62055 points
    Hi Gerhard,

    I believe you may be confusing popcorn noise (Burst Noise, RTS) with low-frequency 1/f noise (flicker noise, pink noise). You are correct that chopper and other zero-drift amplifier topologies do not feature 1/f noise.

    Popcorn noise is a result of random change or step in the base current of a bipolar transistor. While theoretically it could be a result of threshold voltage steps in MOSFET or JFET devices, we typically do not see popcorn associated with MOSFET devices. Popcorn noise in JFET devices is usually related to the bipolar devices in later stages of the amplifier.

    So, since the TLC2254 is a CMOS device without bipolar devices in the design it should not have popcorn noise issues.