Low‐voltage high‐performance current mirrors: Application to linear voltage‐to‐current converter

Abstract

SUMMARYCurrent mirror is one of the basic building blocks of analog VLSI systems. For high-performance analog circuit applications, the accuracy and bandwidth are the most important parameters to determine the performance of the current mirror. This paper presents an efficient implementation of a CMOS current mirror suitable for low-voltage applications. This circuit combines a shunt input feedback, a regulated cascade output and a differential amplifier to achieve low input resistance, high accuracy and high output resistance. A comparison of several architectures of this scheme based on different architectures of the amplifier is presented. The comparison includes: input impedance, output impedance, accuracy, frequency response and settling time response. These circuits are validated with simulation in 0.18 m CMOS TSMC of MOSIS. In this paper, a linear voltage to current converter, based on the adapted current mirror, is proposed. Its static and dynamic behaviour is presented and validated with the same technology.

A Nonlinearity-Compensated All-MOS Voltage-to-Current Converter

“…The simulated transconductance of the proposed VCC after nonlinearity compensation which is shown in Fig. 3 (b) agrees with the tendency as (16) and (17) disclose, the nonlinearity of transconductance in the input voltage range of 1.3 V -3 V has been decreased from ±9% to ±1.4% after the nonlinear errors are compensated using the proposed method.…”

Very low input impedance low power current mirror

“…Pseudo-amplifier contained structure of Fig. 2(e) in [8] which is introduced as the best one by the authors of that paper [8].…”

“…2(c) versus ''V DD '' variations the PSRR of A1cA2 as is defined in [8], i.e. (A1cA2/(DV o /DV DD )), is evaluated and shown in Fig.…”

“…In fact this impedance has a substantial effect on overall dynamic range and frequency response of the circuit. There are many literatures dealing with the problems of input impedance [1][2][3][4][5][6][7][8].…”

“…Carful design of biasing network is required in [6] and circuit proposed in [7] uses floating gate transistors in its feedback loop which has its limitations and needs a more expensive technology to be implemented. In [8] the comparative study of various structures for amplifier placed in feedback loop are performed. In all these schemes the used amplifiers substantially add the complexity of the circuit and result in degradation in both band width and power consumption.…”