Bandgap Reference Voltage Source Research Articles

Design of a High Precision RC Oscillator

This paper introduces a high-precision RC oscillator circuit that is less affected by temperature and supply voltage. The circuit mainly consists of a bandgap reference voltage source, a low-voltage linear regulator, a low-pass filter, and a digital trim circuit, which reduces the circuit's sensitivity to temperature variations and achieves high stability of the oscillator frequency over a wide temperature range. Because of the current digital trimming technique, the circuit's ability to cope with the effects of frequency instability caused by process deviations is further enhanced.The simulation results show that the output center frequency accuracy is maintained within ±0.5% under the supply voltage range of 2.5V~5.5V, temperature range of -40?~125?, and different process corners. The RC oscillator has a high precision output frequency and can be used as a clock signal for a number of highly integrated and high precision applications.

First-order Bandgap Reference Source Design with High Power Supply Rejection Ratio

In this paper, a first-order bandgap reference source with a high power supply rejection ratio (PSRR) is designed. To obtain a low-temperature coefficient, a first-order bandgap temperature coefficient compensation method is used by adjusting the resistor resistance of the positive and negative temperature coefficients, and the gate-source voltage of the current mirror transistor is kept constant to increase the PSRR value in the low-frequency band. A self-start circuit is added to make the circuit start up quickly out of the simple bias point. The simulation results show that the bandgap reference voltage source has a constant 1.25V reference voltage with a temperature coefficient of 8.55ppm/°C in the temperature range of -40 to 125°C. The circuit is simulated using Cadence software. The circuit can be applied to OLED constant current source circuits and power management circuits.

Design of a bandgap reference voltage source with low temperature coefficient and high precision

This paper proposes a high-precision, low-temperature coefficient, and repair-free bandgap reference power supply circuit. This kind of bandgap reference source adopts the way of double-loop feedback, namely through two amplifiers to clamp the voltage to improve the performance of the circuit. The band gap reference source is mainly composed of four parts, including: band gap reference core circuit, amplifier, start-up circuit and Gaussian current compensation circuit. This article mainly analyzes the working principle of the core circuit of the bandgap reference, and derives the mathematical formula of the circuit. When the power supply voltage is 1.8V, the circuit is simulated in the temperature range of -40°C to 125°C with the Hspice software, and the reference source outputs stably. The voltage is 1.25V±4mv, the temperature coefficient is 3.7ppm/°C, and PSRR at low frequencies is -68dB.

A CMOS Bandgap Reference Circuit with a Temperature Coefficient Adjustment Block

A bandgap reference voltage source with a temperature coefficient adjustment block was proposed. The bandgap topology employs current summation and the circuit was designed through metaheuristic algorithms in a 0.35-mm CMOS technology. Simulations with typical parameters show that the designed circuit has temperature coefficient of 15 ppm/0C, line regulation of 263 ppm/V, and current consumption of 2.71 uA in 1.0 V power supply. An additional 3-bit temperature adjustment block allowed keeping the temperature coefficient values lower than 26.6 ppm/0C for 90% of the circuits, without interfering with the reference voltage output or line regulation values.

A Design With High Order Compensation and low Temperature Drift Bandgap Reference Voltage Source

Based on the analysis of the conventional bandgap reference circuitry and the current IC of reference voltage source in the design of low voltage low power consumption and high power supply rejection ratio, a bandgap voltage reference with startup circuit and current compensation circuit is presented. It has a low temperature coefficient(<20ppm/℃)，a temperature coefficient of 9.3ppm/℃ in the temperature range from-50℃ to 125℃, and a PSRR of-64dB at low frequency,which meets the requirements of bandgap reference for low voltage, low power and high PSRR.

A novel high accuracy bandgap reference voltage source

PurposeThis paper aims to design a new bandgap reference circuit with complementary metal–oxide–semiconductor (CMOS) technology.Design/methodology/approachDifferent from the conventional bandgap reference circuit with operational amplifiers, this design directly connects the two bases of the transistors with both the ends of the resistor. The transistor acts as an amplifier to amplify the change of voltage, which is convenient for the feedback regulation of low dropout regulator (LDO) regulator circuit, at last to realize the temperature control. In addition, introducing the depletion-type metal–oxide–semiconductor transistor and the transistor operating in the saturation region through the connection of the novel circuit structure makes a further improvement on the performance of the whole circuit.FindingsThis design is base on the 0.18?m process of BCD, and the new bandgap reference circuit is verified. The results show that the circuit design not only is simple and novel but also can effectively improve the performance of the circuit. Bandgap voltage reference is an important module in integrated circuits and electronic systems. To improve the stability and performance of the whole circuit, simple structure of the bandgap reference voltage source is essential for a chip.Originality/valueThis paper adopts a new circuit structure, which directly connects the two base voltages of the transistors with the resistor. And the transistor acts as an amplifier to amplify the change of voltage, which is convenient for the feedback regulation of LDO regulator circuit, at last to realize the temperature control.

A LOW-NOISE LOW-POWER SECOND-ORDER COMPENSATED CMOS BANDGAP REFERENCE

The design of a low-noise and low-power second-order bandgap reference voltage source using a linear combination of two base-emitter voltages with only one scaling factor is treated. The design takes into account the temperature dependency of the resistors and the finite current gain of BJT�s. The circuit is integrated in a CMOS process. The output voltage is approximately 140 mV with an average temperature dependency of 22.5 ppm/K in the range of 0�C to 120�C. Its equivalent output noise voltage is 57.6nV/vHz. The total current consumption is about 115 �A from a 2V voltage-supply.Keywords: bandgap reference, negative feedback, systematic design.

The Design of Bandgap Reference Based on Empyrean Aether Software

A high-performance bandgap reference voltage source design method is proposed in this paper, according to the shortcomings of traditional bandgap reference voltage source. This method combined CSMC 0.35μm CMOS process with Aether software technology, enabling to improve the bandgap reference source op amp performance and take into account accuracy and stability of the system. From the experimental results: this bandgap reference voltage source output voltage has changed about 63 mV when the temperature varied from to , and the line regulator is 0.4mV/V when the power supply voltage varied from 3.2V to 3.3V. This system has advantages of high accuracy and good stability.

Power-Conditioning Circuitry for a Self-Powered System Based on Micro PZT Generators in a 0.13-$\mu\hbox{m}$ Low-Voltage Low-Power Technology

The concept and design of a power-conditioning circuit for an autonomous low-power system-in-package (SiP) is presented in this paper. The SiP's main power source is based on the use of micropiezoelectric generators. The electrical model of the power source, which has been obtained based on experimental measurements and implemented on Cadence Analog Artist's Spectre simulation environment, is explained. The model has been used to simulate the power source with the power-conditioning electronics over the entire design process. Finally, the simulated and experimental results of the developed integrated power circuits, which are formed by a rectifier and a low-power bandgap reference voltage source to define the threshold voltage for the closed-loop regulation process, are also shown. These circuits have been designed using a commercial 0.13-mum technology from ST Microelectronics through the multi-projects circuits (CMP) techniques of informatics and microelectronics for integrated systems architecture (TIMA) service.

Advanced silicon anemometer design with constant voltage-to-current ratio biasing

In thermal anemometry using silicon, thermal biasing has been shown to be a viable technique. Thermal biasing provides simultaneously a constant supply current and voltage of the sensing bridge, so that constant sensor parameters are guaranteed. Complicated trimming procedures and temperature-compensating techniques have therefore become obsolete. The principle is realized by integrating a double bridge arrangement on a 4 mm 2 piece of silicon. Thermal biasing forms a sound basis for further integration of a complete integrated flow sensor. In this paper a total design is presented, in which a voltage reference source plays a vital role in the overall accuracy. For this purpose, a band-gap reference (BGR) voltage source is discussed, which can operate over the full temperature range. It is implemented in CMOS technology.