LOW POWER LOW VOLTAGE OPERATION OF OPERATIONAL AMPLIFIER

Abhishek Chakraborty

Abstract: The increasing demand for high performance, battery-operated, system-on-chip (SoC) in communication and computing has shifted the focus from traditional constraints (such as area, performance, cost and reliability) to power consumption. With the increasing integration level, energy consumption has become an important issue. Consequently much effort has been put in achieving lower dissipation at all levels of the design process. Minimizing power saves energy, simplifies cooling and contributes to device longibility. The low power design can increase operation time and /or utilize a smaller size and a light-weight battery. Low voltage operation is demanded because it is desirable to use as few batteries as possible for size and weight consideration. Low voltage analog circuit design techniques considerably differ from high voltage design technique .There are so many strategies available for low voltage design. In the field of Analog electronics we generally apply ±15 V or ±12V for proper operation of operational amplifier. In this paper it is shown that if we apply ±5V, then also all the op-amp electrical parameters(such as input offset voltage, input bias current, input offset current, CMRR) maintain datasheet specification for a particular type of IC. Here LM741C IC has been chosen to represent the operation of operational amplifier at ±5V. Here MULTISIM is used for the simulation purpose and the change in the external biasing circuitry is made to meet the datasheet specification of LM741 IC. Research is needed to provide intelligent policies for careful management of the power consumption while still providing the appearance of continuous connection to system service and application.

Keywords: low power, low voltage, input offset voltage, input bias current, CMRR.

DOI: https://doi.org/10.15623/ijret.2015.0404051