An electrocardiogram readout circuit based on CMOS operational floating current conveyor

Abstract

Electrocardiogram (ECG) is used in diagnosing heart diseases. It is designed as integration between current-mode instrumentation amplifiers (CMIA) and low pass filter (LPF). Normal heart behavior can be identified simply by normal ECG that consists of signal while heart disorder can be recognized by having differences in the features of their corresponding ECG waveform. A novel integrated CMOS-based operational floating current conveyor (OFCC) circuit is proposed. OFCC is a five port general purpose analog building block which combines all the features of different current mode devices such as the second generation current conveyor (CCII), the current feedback operational amplifier (CFA), and the operational floating conveyor (OFC). The OFFC is modeled and simulated using UMC 130nm CMOS technology kit in Cadence with a supply voltage 1.2V. The ECG readout circuit has been designed using the proposed OFCC as a building block. The advantages of this: it is integrated, noise factor is small as the proposed OFCC has the lowest input noise voltage and the layout is simple as it is a single block that can be repeated several times