CMOS current mirrors with reduced inputand output voltage requirements

Abstract

A CMOS current mirror with lower than Vos(3a,) input voltage requirement is presented. It is shown that the structure can be modified to provide cascode-type output resistance for output voltages even lower than 2 Vns(sa,). The topology of the proposed current mirror allows low distortion operation from a single 1.5V supply, which makes it attractive for low-voltage applications.Introduction: The current mirror is one of the most important building blocks of analogue integrated circuits. Modern VLSI systems now operating from single 3.3V supplies and dropping, require high performance current mirrors that can operate with

Low Power Folded Cascode OTA

“…The application of Low Power Consumption to the OTA structure provides significant decrease in power with increase in gain. Comer [3,4], In 2004 has explained an approach which may results in very high gain and low power dissipation [5,6] by discussing the effects on the overall composite cascode circuit performance with one device operating in the sub threshold and the other device operating in the active region. To have high output impedance and thereby high gains, cascoding is done, where two MOSFETs are placed one above the other [7][8][9][10].…”

A simple low-voltage cascode current mirror with enhanced dynamic performance

“…In hindsight, we realized that this mirror is a direct analog of the stacked mirror with the bottom The proposed mirror comprises a simple current mirror stacked on top of the low-voltage simple mirror of [6] and a capacitor, connected as shown in (a). In the resulting circuit, shown in (b), the five nMOS transistors are nominally identical, and the bias current, I b , is a deep subthreshold current, whose precise value is not critical as long as I b I in .…”

“…simple mirror replaced with the low-voltage simple mirror of Prodanov and Green [6], as shown in Fig. 1a (without the capacitor).…”

Design of Current-Mode Square-Root Domain Band-Pass Filter with Reduced Voltage

“…All high impedance CMs proposed by Mulder et al [23], Zeki et al [24] and Blalock et al [25] need high input voltage, which provide the capability of high output voltage signal swing. The CMs proposed by [26][27][28] operate with low input voltage, however, the main disadvantage of Prodanov et al [26] has limited current range, Heim et al [27] is not suitable for high frequency applications, and partial transistors of Itakura et al [28] are biased in triode mode such that the mirror is sensitive to geometry and threshold voltage mismatches.…”