|
|
Design of precise bandgap reference in ACMOS process
Kacafírek, Jiří ; Prokop, Roman (referee) ; Ing. Petr Kadaňka, ON Semiconductor v Rožnově p. Radhoštěm (advisor)
In this thesis the principle of voltage reference especially bangap reference is described. Below are described two circuits of this type designed in ACMOS process. There is handmade evaluation of error analysis to identify main error contributors and also monte-carlo simulation. Also statistical analysis is made on the circuit. Results of all methods are compared. Error of reference voltage is compared for both circuits. Circuit with bigger error is optimized to achieve a better precision. Obtained results showed a good agreement of all methods, which evidences importance of hand error evaluation.
|
|
|
Computer modeling of meta-materials
Beran, Jaroslav ; Kovács, Peter (referee) ; Oliva, Lukáš (advisor)
The diploma thesis deals with metamaterial structures. Metamaterials are periodic structures, which have got permittivity or permeability, eventually both parameters, negative. Test is applied on three basic structures: Split Loop Array; Spiral Array a Double Spiral Array. For each structure is made dispersion diagram and are monitored S – parameters. Test is run in Ansoft High Frequency Structure Simulator and CST Microwave Studio software. Are monitored bandgaps and when structure is as left – handed medium or right – handed medium. Results are compared with results in literature.
|
|
|
Error analysis and optimization of low voltage BG reference
Koukol, Martin ; Kledrowetz, Vilém (referee) ; Prokop, Roman (advisor)
The bachelor’s thesis deals with the design of Brokaw type low-voltage BG reference and it’s following optimalization using error analysis to achieve better precision than ±0,5 % with level of accuracy 4 sigma. The main focus of the thesis is the error analysis itself and finding the individual factors that affect precision. Design and optimalization of the voltage reference were made in program Cadence Virtuoso.
|
|
|
Band Gap - accurate voltage reference
Bubla, Jiří ; Petržela, Jiří (referee) ; Kolka, Zdeněk (advisor)
This diploma thesis is specialized on a design of a high accuracy voltage reference Bandgap. A very low temperature coefficient and output voltage approx. 1,205V are the main features of this circuit. The paper contains a derivation of the Bandgap principle, examples of realizations of the circuits and methods of compensation temperature dependence and manufacture process, design of Brokaw and Gilbert reference, design of a testchip and measurement results.
|
|
| |
|
|
Voltage References in Bipolar and CMOS Process
Kotrč, Václav ; Prokop, Roman (referee) ; Kadaňka, Petr (advisor)
This diploma thesis deals with precise design of Brokaw BandGap voltage reference comparing with MOS references. There is STEP BY STEP separation and analysis of proposed devices, using Monte Carlo analysis. There are also presented the methods for achieving a lower deviation of the output voltage for yielding device, which needs no trimming.
|
|
|
Design of low-voltage supply and reference block based on the bandgap reference
Zwiener, Jan ; Kledrowetz, Vilém (referee) ; Prokop, Roman (advisor)
This diploma thesis deals with the analysis and evaluation of four different circuit solutions that are used to construct a stable reference voltage. In the literature, these circuits are referred to as bandgap references, and this thesis discusses the principle of their operation. Based on the achieved results, one circuit solution was selected, which forms the basis of the designed device containing eight reference voltages with values (0.8; 1.0; 1.2; 1.5; 1.8; 2.0; 2.5; 3.3) V and one voltage supply, to which one of the reference voltage values can be assigned using a binary code. This device contains sources of four reference currents with values (1; 2; 4; 8) µA.
|
|
|
Curvature correction of the BandGap reference output voltage
Žeravík, František ; Háze, Jiří (referee) ; Prokop, Roman (advisor)
This thesis deals with the design of a Brokaw BandGap reference, a BandGap reference in a simple CMOS process, as well as the respective compensation circuits for correcting the curvature of the output voltage. In the theoretical part, the emphasis is mainly on describing the temperature dependency of the UBE voltage of the bipolar transistor and understanding the principle of the elementary BandGap reference. Based on these findings, the function and design of both BandGap references for an output voltage of 1.5 V are described. In the second part, the thesis focuses on describing various methods for correcting the curvature of the output voltage. Based on these methods, the first-order BandGap references supplemented with compensation circuits are designed. In the conclusion, the resulting parameters of the designed BandGap references without correction and with a compensation circuit are summarized and compared.
|
|
|
Error analysis and optimization of low voltage BG reference
Koukol, Martin ; Kledrowetz, Vilém (referee) ; Prokop, Roman (advisor)
The bachelor’s thesis deals with the design of Brokaw type low-voltage BG reference and it’s following optimalization using error analysis to achieve better precision than ±0,5 % with level of accuracy 4 sigma. The main focus of the thesis is the error analysis itself and finding the individual factors that affect precision. Design and optimalization of the voltage reference were made in program Cadence Virtuoso.
|
|
|
Design of low-voltage supply and reference block based on the bandgap reference
Zwiener, Jan ; Kledrowetz, Vilém (referee) ; Prokop, Roman (advisor)
This diploma thesis deals with the analysis and evaluation of four different circuit solutions that are used to construct a stable reference voltage. In the literature, these circuits are referred to as bandgap references, and this thesis discusses the principle of their operation. Based on the achieved results, one circuit solution was selected, which forms the basis of the designed device containing eight reference voltages with values (0.8; 1.0; 1.2; 1.5; 1.8; 2.0; 2.5; 3.3) V and one voltage supply, to which one of the reference voltage values can be assigned using a binary code. This device contains sources of four reference currents with values (1; 2; 4; 8) µA.
|
guest ::
