The document compares different amplifiers for amplifying electrocardiography (ECG) signals, including differential amplifiers, operational amplifiers, and operational transconductance amplifiers (OTAs). It analyzes the gain, common mode rejection ratio (CMRR), and other performance parameters of each amplifier through simulations and calculations. The OTA is found to have higher gain and comparable CMRR to operational amplifiers. Overall, the OTA provides better amplification of low-level ECG signals and is well-suited for biomedical applications requiring low noise and power efficient amplification.