The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
A new signal-processing unit (SPU) for implantable biomedical sensors is proposed. The proposed scheme combines the advantages of the two main structures of conventional SPUs (delta-sigma modulator and charging capacitor in feedback). The preliminary design has been realised in a 0.35 μm CMOS process. Test results validate the desired functionality of the system. In this reported work an additional modification to the SPU is proposed to facilitate simple frequency modulation. Simulation results in the same process confirm the linearity of the system corresponding to a wide range of sensor currents.