This paper demonstrates the design of the 8 channel and 16 channel biomedical data selector with passtransistor switches. Pass transistor switches are designed with NMOS switch logic in 45nm technology. Data selectors are the important input circuitry to instrumentation amplifier in the Electrocardiogram (ECG). Generally, Inputs for ECG are very low voltages in terms of millivolts and frequency also in HZs. The proposed designs are useful in 3 lead 6 lead and 12 lead ECGs. The power dissipation is 11.055 pW at 1HZ and its calculated for supply voltages of 0.5 V and frequency analysis are done in between 1HZ to 10 KHZ.

The use of portable devices is increasing day by day. Mainly these devices play a vital role in medical field when the doctors are unavailable. In that one of the important emergency medical portable systems is Electro Cardiogram (ECG). ECGs are used to measure the abnormalities of the heart by performing electrical activities. It can be done by attaching electrodes on the body for few minutes. To collect the information from electrodes data acquisition system is used in ECGs or in any biomedical systems. The major challenge in implementing data acquisition system is the increase in power dissipation due to the excessive contact impedance of electrodes. As a solution to this, A CMOS 12 lead ECG data acquisition circuit is designed by using analog multiplexers is proposed in this paper. The proposed system is designed by using improved DTMOS based analog multiplexers and these works with a power supply of ±0.2 V with a dynamic voltage range from 1uv to 200mv with the Power dissipation of 140 nW.

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