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Title Design of a Precision Low Voltage Resistor Multiplying Digital-to-Analog Converter
Publication Date
Date Accessioned
Degree MS
Discipline/Department Electrical Engineering
Degree Level masters
University/Publisher Texas A&M University
Abstract This work aims to model the effect of the input offset voltage of an operational amplifier on the performance of a high-precision, voltage-mode, resistor-based multiplying digital-to-analog converter (M-DAC). Based on the model, a high precision current buffer is proposed to isolate the resistor ladder from the operational amplifier. A 14-bit M-DAC operating with a ±1V reference of the proposed architecture. Post-layout simulations show that the proposed architecture reduces the offset voltage to an offset error in the DAC transfer function. The maximum DNL is maintained at -0.385 LSB for an input offset voltage of up to 60mV (1024 LSB). The current buffer also introduces an inversion of the output voltage, yielding a non-inverted output. This alleviates the need for an additional high precision op-amp to invert the output voltage.
Subjects/Keywords DAC; input offset voltage; high-precision; current buffer
Contributors Karsilayan, Aydin I (advisor); Silva-Martinez, Jose (advisor); Khatri, Sunil (committee member); Hur, Pilwon (committee member)
Language en
Country of Publication us
Record ID handle:1969.1/165708
Repository tamu
Date Indexed 2020-08-12
Grantor Texas A & M University
Issued Date 2017-05-17 00:00:00

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…32 4.3 VOU T vs CODE without the current buffer . . . . . . . . . . . . . . . . . 33 4.4 VOU T vs CODE with the current buffer . . . . . . . . . . . . . . . . . . . 34 4.5 Input offset voltage reduced to offset error…

…amount of current flowing through the feedback resistor leading to gain errors. CMOS and FET amplifiers are therefore preferred as TIAs for the M-DAC because they have very low input bias currents (≤1pA). The input offset voltage is defined in…

…CMOS amplifiers the input offset voltage is primarily due to the differences in the threshold voltages of the input transistors of the differential pair which is caused due to the variation of the width, length, thickness and doping levels of the…

…output impedance (RIOU T ) from the TIA making the DAC insensitive to the amplifier’s input offset voltage. Furthermore, if the current buffer offers an output impedance much larger than the feedback resistor (RF B ) then the offset

…x28;DAC) converts a multi-bit digital input signal to an analog output voltage or current. In most cases, this is achieved by using an array of passive elements, such as resistors or capacitors, to attenuate or amplify a reference voltage and use…

…the digital input code to select a particular branch. Active elements such as op-amps or transconductance amplifiers (OTA) may also be used to convert the output voltage or current and also achieve high load driving capability. DACs also…

…Static Metrics A DAC transfer function can be obtained by plotting the output analog signal versus input digital code as shown in Figure 2.1. Each of the static performance metrics - offset, gain, differential nonlinearity and integral nonlinearity…

input voltage reference swing of the M-DAC at full-scale, given by VREF < SR πft A higher voltage reference swing will be severely distorted. 15 (2.8) 2.3.2 Static Limitations The input bias current of an amplifier can reduce the…