Abstract
Based on the SMIC 0.13 um CMOS technology, this paper uses a 0.8 V supply voltage to design a low-voltage, ultra-low-power, high-gain, two-stage, fully differential operational amplifier. Through the simulation analysis, when the supply voltage is 0.8 V, the design circuit meets the ultra-low power consumption and also has the characteristic of high gain. The five-tube, fully differential, and common-source amplifier circuits provide the operational amplifier with high gain and large swing. Unlike the traditional common-mode feedback, this paper uses the output of the common-mode feedback as the bias voltage of the five-tube operational transconductance amplifier load, which reduces the design cost of the circuit; the structure involves self-cascoding composite MOS, which makes the common-mode feedback loop more sensitive. The frequency compensation circuit adopts Miller compensation technology with zero-pole separation, which increases the stability of the circuit. The input of the circuit uses the current mirror. A small reference current is chosen to reduce power consumption. A detailed performance simulation analysis of this operational amplifier circuit is carried out on the Cadence spectre platform. The open-loop gain of this operational amplifier is 74.1 dB, the phase margin is 61°, the output swing is 0.7 V, the common-mode rejection ratio is 109 dB, and the static power consumption is only 11.2 uW.
Highlights
The op-amp circuit presented in the reference [2] uses a 5.5 V supply voltage with great power consumption
The increase in power consumption can expose the product to the danger of high temperature operation and reduce the stability of the system’s operation
In order to comply with the development goals of low voltage and low power consumption, an opamp is a better choice for today’s various portable electronic products and smart wearable devices
Summary
Under the background that it is difficult to increase the battery capacity in such devices, it is necessary to reduce the power consumption of the circuits in order to improve their endurance. Because of the power consumption and supply voltage’s positive exponential relationship, reducing the supply voltage has become one of the important initiatives to reduce the power consumption of portable products [1]. The im plementation of low power consumption in analog circuits depends heavily on the power consumption of the operational amplifiers. In order to comply with the development goals of low voltage and low power consumption, an opamp is a better choice for today’s various portable electronic products and smart wearable devices. A fully differential operational amplifier with low voltage, ultra-low power consumption, and high gain is designed
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