Comparison of bulk driven, floating gate and sub threshold methods in designing of a typical amplifier

Nowadays one of the most important parameters in designing analog circuits or even in the digital circuits is Reducing the consumption power of the circuit. In analog circuits, power consumption has a direct relationship with the values of circuit supply voltage and given the equation P=V_load×C×f_ddclk^2in digital circuits the power can be directly related to the square of the supply voltage value. It is therefore concluded that the reduction of power consumption of analog or digital circuits can be achieved by reducing the supply voltage. Another advantage of low supply voltage is that circuits are easy to transport because the small battery is used as the supply voltage on them. (e.g., audio devices).