4.8 Right Leg Drive

The RL electrode is driven directly by the RLD signal generated on-chip by the ADS1298. The bandwidth of the RLD loop is determined by R8 (392kΩ) and C20 (10nF). Users can change these values to set the bandwidth based on their specific application. The loop stability is determined by the user’s specific system. Therefore, adjustment of the feedback component values may be required to ensure stability if additional filtering components and long cables are added before the ADS1298ECG-FE.

In a typical application, the RLD signal is implemented as the average of RA, LA, and LL. For system flexibility, the ADS1298 allows the user to select any combination of the electrodes to generate the RLD (see ADS1298 data sheet or ADS1198 data sheet for more details).