Abstract
In this study, a low-voltage current mirror to use in differential pair as an active load is introduced. The proposed current mirror which can operate at ±0.5 V has high output impedance and low input impedance. The proposed structure employs the principle of the voltage level-shifting for PMOS transistors. The voltage level-shifting operation has been achieved by using bulk voltage at this structure. Also, spice simulations justify the highly good performance of this current mirror with a bandwidth of 11 GHz by using external capacitor at input current of 200 μA.
Highlights
Nowadays, integrated circuit design has concentrated on a circuit with low-voltage operation, low-power dissipation, wide bandwidth and minimum area requirements
Numerous low voltage applications have been proposed earlier [1,2]. Considering several technologies such as bipolar junction transistor (BJT), metal-oxide-semiconductor (MOS) and bipolar complementary MOS (BiCMOS), the CMOS technology has played a crucial role in the development of low power circuit for diverse applications
A low-voltage current mirror circuit employing the voltage level-shifting principle is demonstrated for use in differential pair as an active load
Summary
Nowadays, integrated circuit design has concentrated on a circuit with low-voltage operation, low-power dissipation, wide bandwidth and minimum area requirements. The demand for circuits operating at low voltage has increased due to the need for low power dissipation. The low-voltage current mirror has been used in a lot of active elements designed with low-power. The performance parameters of current mirrors like active elements parameters contain linearity, power dissipation, minimum supply voltage requirement, input and output resistance in these applications. The low-voltage operation of the active elements has been restricted because these current mirrors have high input voltage. A low voltage level shifter-based current mirror has been presented in Ref. A low-voltage PMOS current mirror employing voltage level-shifting principle has been introduced. The circuit utilizes a voltage level shifter at the input port to achieve the high input voltage swing capability It can operate with low power supply voltage and low input /low output voltage requirements. The proposed structure as an active load has been used in the transconductance amplifier
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