daisy boards, why didn't connect BIAS_DRV and BIAS_INV in Cyton and not place R5/C9 in Daisy? The configuration they didn't want to prevent, is to have the two bias circuits (of Cyton and Daisy) runn

I see from the block diagram of the ADS1299 that there a single place where the output of each channel are summed and connected to the BIAS_INV pin.

Please check Cyton schematic. According to it, BIAS_DRV and BIAS_INV nets are not connected to each other. I measured high impedance between ADS1299 pin 61 and related pin of resistor array R6. This m

According to TI's recommendation, BIAS_DRV net should be connected to BIAS_INV net in the Cyton schematic. However, this is not realized. In the existing case, inverting input of the bias amplifier is

Compare the Cyton and Daisy schematics. BIAS_INV on both boards are connected, and connected to both ADS1299s.

I don't mean in the Bias_INV in the ADS, I mean in the Cyton Schematic I don't see it being connected to anything. Does the Cyton not use Bias_INV?

If you actually look at the TI data sheet, you can see that BIAS_INV connects all the ADS1299 chips as a BIAS_INV bus. So that all chips cooperate in estimating the common mode noise and derived inver

I see how Bias_DRV connects to the BIAS pins on the cyton, but I don't see Bias_Inv used anywhere, is it necessary?

Is the bias upper pin connected to the BIAS_INV and the bias lower pin connected to BIAS_DRV or the other way?

The ADS1299 chips share the BIAS_INV amongst themselves as a consensus determination of what Bias signal to produce. BIAS_INV is a 'bus' shared between the ADS1299 chips. It is not the Bias output. Ea

"The BIAS_INV connection between the main board and daisy module makes

2 - Why are the two BIAS the same? I confirmed with a meter that the BIAS pins and the BIAS_INV thru-hole are not the same node. So wouldn't you want the signal/voltage from (one of) the ear clip elec

there is no direct shared SRB pin and the shared BIAS_INV pin is not the same thing as BIAS. So if I want the ear clip electrodes to be the SRB and BIAS on both boards, it would seem they have to be

Because The BIAS IN and Out and BIAS_INV are all connected to the amplifier internally so daughter board's BIAS_INV(which is connected with mother board) will also have comes from the BIAS IN and OUT.

The BIAS_INV is connected to the Daisy (yes, I know, it's not 'really' daisy) and therefore the channels selected on the Daisy to be a part of the Bias generation are all input into the mother board B

http://openbci.com/forum/index.php?p=/search&Search=bias_inv

The BIAS_INV connection between the main board and daisy module makes connection between every channel that has 'include in bias' selected from the GUI. That pin is not the electrode BIAS output! The

As said above, we are connecting the BIAS_INV pins of each, which is how the Bias generation is able to include any and all of the input channels.

i am totally confused on how to connect the pins of ADS1299 namely BIAS_IN, BIAS_INV, BIAS_OUT and BIAS_REF. what does the BIAS_ELEC do? I am desperately in need of help..

You are right tha the BIAS_INV is used as an input from daisy-chained BIAS_OUT pins, to include as many BIAS signals as you like from stacked devices.