HI Bhaskar,
Attached is an TI precision design you may find useful. Although the design documents a ECG data acquisition system (single channel), the stability and compensation of the common-mode drive compensation circuit is discussed in detail on…
Hi Roshan,
There are a few comments/suggestions the circuit:
- Please add low-pass filters at the INA333 input with a low frequency corner to filter all the extrinsic high-frequency noise. The EOG signal of interest is relatively low-frequency. The…
HI Alex,
ECG/EEG applications typically require very low noise in the low frequency range, or very low 1/f /flicker noise.
Chopper amplifiers offer no 1/f noise, however, the input bias current is higher on chopper amplifiers when compared to other…
Hello Kensuke-san,
No, we do not have evaluation data for this circuit. More details about ECG circuits can be found here:
e2e.ti.com/.../2437.ecg-heart-signal-acquisition.aspx
A group at Michigan State University built an verified functionality…
Hello Dan,
While we don't have an application note specifically for using the INA827 for biopotential measurement, there is quite a bit of information that may be of use. Here are some links:
1) ECG Signal Acquisition FAQ page: e2e.ti.com/.../2437…
Edouard,
TI has several reference designs for different applications that have been tested with specific schematics and written up with explanations of the theory of operation. If you look at this one: http://www.ti.com/tool/TIPD116, it has a data…
Hari,
Many SPICE simulators may have convergence issues if all nodes don't have a DC pathway to ground. In your circuit, the inputs to the INA333 are biased through the OPA350 used in the common mode circuit which may be causing the simulation issue…
Sorry for the delay in response, we are in holidays in the US.
Because of the drop between input and output being relatively high (relative to the dropout voltage), it is expected that there will be a certain amount of power dissipation, in your case…
Other Parts Discussed in Thread: ADS8881 The circuit shown in Figure 1 is optimized for high resolution (18 bits) and ultra low power for wearable and portable medical applications. The passive filtering and compensation network is optimized for noise…
