Abstract
In this paper, a low voltage low power operational transconductance amplifier (OTA) structure is proposed. To achieve the low voltage low power operation, level shifter current mirrors are employed in the circuit structure. The proposed structure operates at ±0.5 V as supply voltages and dissipates power as 83 µW. Positive and negative slew rate of the circuit is 223 V/µs and 162 V/µs, respectively. Furthermore, the bandwidth of the circuit is about 80 MHz. The designed OTA is simulated with 0.18 µm TSMC CMOS technology parameters using SPICE. Simulation results have been justified the theoretical approach.DOI: http://dx.doi.org/10.5755/j01.eee.21.2.115011
Highlights
In recent years, usage of the battery-powered devices such as smart phones and portable medical equipments have became really widespread
The analog signal processing devices can be classified into two groups such as voltage mode and current mode devices
The proposed operational transconductance amplifiers (OTA) and the low pass filter are simulated with 0.18 μm CMOS technology parameters using SPICE
Summary
Usage of the battery-powered devices such as smart phones and portable medical equipments have became really widespread. The recent MOS structures with smaller channel dimensions are able to operate with low supply voltages. Slew rate, power dissipation and circuit complexity, the voltage mode devices exhibit the worse performance. The current mode devices such as current conveyors and operational transconductance amplifiers (OTA) have became more popular in recent years. There are a lot of circuit structures designed with OTA such as filters, instrumentation amplifiers, oscillators and analog multiplier in the previous studies [9]– [13]. The OTA proposed in this paper employed level shifter current mirrors as an active load to operate with lower supply voltages and cross-coupled quad transconductance structure is used to improve the linearity [21]–[24]. A current controlled low pass filter is designed to indicate the applicability of the proposed circuit. The circuit exhibits good slew rate performance and has an acceptable frequency behaviour
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