A very high precision 500-nA CMOS floating-gate analog voltage reference

Ahuja, B.K.; Vu, Hoa; Laber, C.A.; Owen, William H.

doi:10.1109/jssc.2005.856268

Cited by 38 publications

(21 citation statements)

References 5 publications

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“…A range of voltage and current reference generators are available to be compiled on the FPAA to reduce the temperature variability of the system. Here, we propose to use a Floating Gate (FG) as a programmable element to achieve reasonable temperature insensitivity rather than trimming/single value FG to achieve precision [9]. These references form standard blocks in the open source tools built in the Scilab/Xcos environment, available online [10,11].…”

Section: Analog Processing and Temperature Dependencementioning

confidence: 99%

Models and Techniques for Temperature Robust Systems on a Reconfigurable Platform

Shah

Töreyin

Hasler

et al. 2017

JLPEA

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This paper investigates the variability of various circuits and systems over temperature and presents several methods to improve their performance over temperature. The work demonstrates use of large scale reconfigurable System-On-Chip (SOC) for reducing the variability of circuits and systems compiled on a Floating Gate (FG) based Field Programmable Analog Array (FPAA). Temperature dependencies of circuits are modeled using an open-source simulator built in the Scilab/XCOS environment and the results are compared with measurement data obtained from the FPAA. This comparison gives further insight into the temperature dependence of various circuits and signal processing systems and allows us to compensate as well as predict their behavior. Also, the work presents several different current and voltage references that could help in reducing the variability caused due to changes in temperature. These references are standard blocks in the Scilab/Xcos environment that could be easily compiled on the FPAA. An FG based current reference is then used for biasing a 12 × 1 Vector Matrix Multiplication (VMM) circuit and a second order G m − C bandpass filter to demonstrate the compilation and usage of these voltage/current reference in a reconfigurable fabric. The large scale FG FPAA presented here is fabricated in a 350 nm CMOS process.Keywords: circuits and system; temperature dependence; reference generator; FPAA Analog Processing and Temperature DependenceThe number of systems combining elements from within and among the emerging technologies of sensors, communications, and robotics grows every day. The computational abilities of these systems affect the overall system performance through various aspects (e.g., functionality, battery-life, foot-print, etc.). Traditionally most computational tasks have been performed in the digital domain, which can achieve high resolution computation at the cost of high power consumption [1]. For systems with a limited power budget, however, low-power, real-time computation techniques have been sought after. Accordingly, analog-signal-processing has been used extensively as an energy-efficient alternative to digital options [2][3][4].Recent mixed-mode large-scale Field-Programmable Analog Array (FPAA) enables advanced functionality for a wide spectrum of sensor applications [5]. These FPAAs combine the energy-efficiency, reconfigurability, and programmability of floating-gate-based analog signal processing with the precision and compatibility of digital, thereby a variety of analog circuitry implemented on FPAAs serve as building blocks of more complex signal processing functions [5].Many of the systems that can benefit from the computational power of an FPAA need to operate over a range of environments and temperatures. For instance, modern ubiquitous medical health assessment systems use physiologic signals collected from ambulatory subjects during daily outdoor

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Section: Analog Processing and Temperature Dependencementioning

confidence: 99%

Models and Techniques for Temperature Robust Systems on a Reconfigurable Platform

Shah

Töreyin

Hasler

et al. 2017

JLPEA

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“…There are alternative circuits capable of obtaining lowvoltage and high-accuracy, nevertheless those approaches may require components not readily available in CMOS technology (additional fabrications steps), or CMOS transistor on subthreshold operation, or floating gate or even by using trimming [25][26][27]. Since the circuit is intended to be used in an implanted device, the temperature range is very small and therefore it is not taken into account.…”

Section: Voltage References Circuitmentioning

confidence: 99%

A linear voltage regulator for an implantable device monitoring system

Crepaldi

Pimenta

Moreno

et al. 2010

Analog Integr Circ Sig Process

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This paper describes a CMOS implementation of a Linear Voltage Regulator (LVR) used to power an implanted physiological signal system that is used to monitor the blood pressure. The topology is based on a classical structure of a Low Dropout Regulator (LDO) and receives his activation energy from a RF link characterizing a passive RFID tag. The LVR was designed to achieve important features like low power consumption, and a small silicon area without the need for any external discrete components. The low power operation represents an essential condition to avoid a high energy RF link, thus minimizing the power of the transmitter and the thermal effects on the patient tissues. The project was diffused in a 0.35 lm CMOS TSMC technology and a prototype was tested to validate the overall performance. The LVR output is regulated at 1 V and supplies a maximum load current of 0.5 mA @ 37°C. The load regulation is 13 mV/mA and the line regulation is 39 mV/V. The LVR total power consumption is 1.2 mW.

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“…It is typically the sum of the base-emitter voltage of a bipolar transistor biased in the forward region, which exhibits negative TC, and an amplified version of the difference between two base-emitter voltages generated by two bipolar devices sized with different emitter areas and possibly different bias current [6]. However, compared with V T , which is a fully linear function of T, V BE is a complex function of T containing many higher order terms.…”

Section: A New Curvature Compensation Technique For a New Structurementioning

confidence: 99%

“…In [5], the reference voltage is logarithmic curvature-corrected using a multiple differential structure with 9.4 ppm/°C. In [6], the reference voltage can obtain about 1 ppm/°C using floating-gate with stored charge technique, but the circuit is very complex. In [7], the approach is the use of exponential temperature dependencies of the current gain b of an NPN, which is similar to the technique of this paper.…”

Section: Introductionmentioning

confidence: 99%

A 0.52 ppm/°C high-order temperature-compensated voltage reference

Liu

Luo

et al. 2009

Analog Integr Circ Sig Process

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This paper proposed a new high-order curvature compensation technique for a new bandgap voltage reference structure using the temperature characteristics of current gain b and emitter bandgap narrowing factor DE G of a lateral NPN bipolar transistor. The new structure can produce two voltage references, which are 1.209 and 2.418 V, respectively. The simulation results show that the temperature coefficients of the two output voltage are 0.52 ppm/°C, the PSRR is more than 60 dB for frequencies at 10 kHz, and the circuit dissipates 0.18 mW with 5-V supply.

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A very high precision 500-nA CMOS floating-gate analog voltage reference

Cited by 38 publications

References 5 publications

Models and Techniques for Temperature Robust Systems on a Reconfigurable Platform

Models and Techniques for Temperature Robust Systems on a Reconfigurable Platform

A linear voltage regulator for an implantable device monitoring system

A 0.52 ppm/°C high-order temperature-compensated voltage reference

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