Amplifying signals from Piezo strip TE 10184000-01

Hi Plawat,

It is likely that none are appropriate. These are autozero amplifiers, which in spite of relatively high input impedance, can have transient currents from the autozero circuitry that can manifest as elevated noise when the input impedance is high.

There is no offset specified for this sensor, and DC offset is not important in these applications, so you don't need autozero.

From the datasheet, the most important amplifier spec looks like input impedance:

"To obtain a response to 0.1 Hz (-3dB point) with a simple voltage-mode circuit, an input resistance of 220M is required. If only heart rate is required (and not respiratory rate), then a lower limiting frequency in the range 1 – 3 Hz may be sufficient. "

So you will need a very low bias current amplifier, ideally located as close to the sensor as possible. If it is located remotely, you will need to use low-leakage wiring (Teflon or similar).

Moving to the op-amp forum as well, since this is a component-level question.

-Mark

Hi Plawat,

It is likely that none are appropriate. These are autozero amplifiers, which in spite of relatively high input impedance, can have transient currents from the autozero circuitry that can manifest as elevated noise when the input impedance is high.

There is no offset specified for this sensor, and DC offset is not important in these applications, so you don't need autozero.

From the datasheet, the most important amplifier spec looks like input impedance:

"To obtain a response to 0.1 Hz (-3dB point) with a simple voltage-mode circuit, an input resistance of 220M is required. If only heart rate is required (and not respiratory rate), then a lower limiting frequency in the range 1 – 3 Hz may be sufficient. "

So you will need a very low bias current amplifier, ideally located as close to the sensor as possible. If it is located remotely, you will need to use low-leakage wiring (Teflon or similar).

Moving to the op-amp forum as well, since this is a component-level question.

-Mark