ABSTRACT
Technological advancements in healthcare applications have led to the increasing demand for compact and portable gadgets. The neural application devices are located near vital regions of the body for uninterrupted signal recording; therefore, it is necessary that there is minimum heating involved, as it may cause damage to the implanted region or surrounding areas. These recording devices additionally should be immune to the surrounding noises and interference to avoid any false detection in the original data. The neural circuits designed for recording data from the electrodes should operate at low power and should consume low noise and area. The neural signals have very low magnitude in the range of microvolts to millivolts and a narrow bandwidth below 1 kHz. Numerous works by various researchers have been reported in which the circuit performance parameters have been enhanced by novel ideas and there has been modification in existing designs. In this chapter, a detailed analysis has been made for three different unique circuit designs and the simulated results have been compared with the recent works in the relevant area for comprehension. This work is novel because it implements the voltage doubling technique and flip voltage follower (FVF) in the standard circuit designs, which are described in detail later in the chapter. These circuits have been designed from the perspective of being used as preamplifiers to record the incoming neural signals. The circuit simulations for all three designs have been performed in a 180-nm CMOS SCL Cadence environment.
