A wide dynamic range continuously adjustable CMOS current mirror

Tunable linear CMOS current mirror

“…Considering the significantly wider current gain tuning range, it is also superior with respect to the structures proposed in [8][9][10]. It is also worth mentioning that, use of triode MOSFETs not only avails tunability, but also relaxes the stability issues significantly, with respect to saturated-MOSFET-based conventional active-input current mirrors, like the one in [11].…”

“…However, the translinearity principle does not help obtaining the same performance from strong-inversion MOS counterparts, therefore efforts for obtaining tunable linear MOS current mirrors are relatively limited [6][7][8][9][10]. Some of those works make use of the weak inversion region to achieve a wide tuning range (current gain tuning range) [6] and most of them utilize the translinearity principle but usually in weak inversion to obtain tunable linear current mirrors [6][7][8].…”

“…Nevertheless, a sufficiently linear widedynamic-range circuit operating in both weak and strong inversion was reported, but its tuning range is narrow [10]. In this work, a new wide-range-tunable linear current mirror is proposed which is tuned via triode MOSFETs.…”

Electronically Adjustable Current Mirrors

“…• Absence of low-voltage operation capability [3] • Limited range of gain adjustment [5] • Employment of PMOS transistors for handling ac signals [ [1,3,4,6] • Limited bandwidth and/or several restrictions imposed by the utilization of MOS transistors operating in weak inversion or triode region [4,6] • Requirement of a specific nonlinear form of input currents [2] In contrast with previous implementations, the proposed scheme of current mirror simultaneously offers low-voltage operation capability employment of only NMOS transistors biased in strong inversion, absence of any imposed restrictions concerning the input current and bidirectional adjustment of gain.…”

CMOS current mirror with enhanced input dynamic range

“…They are the integral parts of such components [1]. Although most CM topologies are desired to have high output impedance and large output voltage/current signal swings [2][3][4][5][6][7][8][9][10][11][12][13], there are certain applications, where designers are also interested in having large input swings. For example, the X -terminal of the current conveyors, controlled current conveyors and four-terminal floating nullors with linear current following properties requires the larger input current swing thereby voltage swing for their practical application [14].…”