Low voltage,high CMRR,and wide bandwidth novel current mode current controlled instrumentation amplifier

In this paper, a new current controlled instrumentation amplifier structure is proposed. The introduced circuit uses three current controlled conveyors and a single grounded resistor. This structure offers several enhanced advantages in comparison with other current and voltage modes instrumentation amplifiers. It provides attractive features such as: wide bandwidth independent to the differential gain, current tuned gain, high common mode rejection ratio without requiring matched resistors and low supply voltage equal to ±0.75 V. Accordingly, the proposed amplifier is a suitable element for integrated circuit implementation in the medical field. The used second-generation current controlled conveyor has a very simple structure. It is generally constituted of two NPN and seven CMOS transistors and it has numerous interesting characteristics. Theoretical analysis is carried out taking into consideration the non-ideality parameters of the conveyors. The circuit features are corroborated via a PSPICE simulation; the results are also compared to those of the previous structures presented in the literature.