Design a high precision and high output impedance current mirror in ۰.۱۸um-CMOS

In many biomedical applications operating at low voltage require very high output impedance current mirror. In this paper, “A very high impedance current mirror, with less number of transistors which can operate at low voltage without any additional biasing circuitry” is proposed. The proposed current mirror uses MOS current dividers to sample the output current to achieve very high impedance with a large output and voltage range. This implementation yields an increase in the output impedance by a factor of about gmrout compared with that of the super-Wilson current mirror, thus offering a potential solution to mitigate the effect of the low output impedance of deep submicron CMOS transistors used in low voltage current mirrors and current sources. The output of the proposed circuit is plotted in ۳ input streams and compared with several previous structures. Simulation with Hspice software and ۱۸۰ nm cmos technology.

Keywords:

high precision , output impedance , current mirror