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Design and development of sigma-delta AD converter in switched capacitor technique
Forejtek, Jiří ; Fujcik, Lukáš (referee) ; Háze, Jiří (advisor)
The work deals with the design of novel high order sigma-delta AD converter using switched-capacitors approach. Model of the ideal and real architecture of the third order sigma-delta modulator was designed in MATLAB SIMULINK. The comparison of the ideal and real model of sigma delta architecture is described in this thesis. On the basis of simulation results in MATLAB SIMULINK the stages of modulator on transistors level in CMOS technology were designed. Fully differential operational amplifier, switched capacitor integrator, summing amplifier, comparator, one bit digital to analog converter and nonoverlapping clock generator were designed. The circuit of third order sigma-delta modulator was simulated in CADENCE. Layout of operational amplifier and switched capacitor integrator was made. Through the use of MATLAB was designed decimation filter as well.
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Active electrical filters based on switched-capacitor circuits
Třeček, Stanislav ; Dostál, Tomáš (referee) ; Brančík, Lubomír (advisor)
This thesis deals with concept of universal frequency filter by application of a switched-capacitor functional block. The concept is based on the theory of switched-capacitor circuits and the theory of a design of classical frequency filters. The printed circuit board was designed based on the filter connection developed by using a software Eagle. The filter was implemented as a laboratory product. This product has been revitalized and the frequency response of all types of filters has been measured. The measured parameters were compared with the parameters set out in the technical documentation of functional block.
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Design of a SAR AD converter with switched capacitors
Sysel, Jan ; Kledrowetz, Vilém (referee) ; Prokop, Roman (advisor)
This work deals with the design of analog to digital converter with a successive approximation register for automotive industry with the range of operating temperatures from -40 °C to 175 °C and with the use of DAC with switched capacitors between interconnect metal tracks in an integrated circuit to minimize converter area. Theoretical part deals with the basic theory of analog to digital converters, principle of converter with a successive approximation register with the utilization of capacitive DAC. Then with the design of capacitors for the DAC in an integrated circuit made of metal layers and vias and their layout to minimize parasitic capacities. In the practical part is made the theoretical design of the converter on block level. Then is done the design of a capacitor for this DAC and layout of the whole DAC is made. On the transistor level are designed and verified blocks required for realization of this converter: circuit of voltage follower, operational amplifier, comparator and switches. Inside the converter the self-test circuit is implemented for measurement of its own nonlinearity. In the work the functionality of the converter is verified as a whole.
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Active electrical filters based on switched-capacitor circuits
Třeček, Stanislav ; Dostál, Tomáš (referee) ; Brančík, Lubomír (advisor)
This thesis deals with concept of universal frequency filter by application of a switched-capacitor functional block. The concept is based on the theory of switched-capacitor circuits and the theory of a design of classical frequency filters. The printed circuit board was designed based on the filter connection developed by using a software Eagle. The filter was implemented as a laboratory product. This product has been revitalized and the frequency response of all types of filters has been measured. The measured parameters were compared with the parameters set out in the technical documentation of functional block.
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Design and development of sigma-delta AD converter in switched capacitor technique
Forejtek, Jiří ; Fujcik, Lukáš (referee) ; Háze, Jiří (advisor)
The work deals with the design of novel high order sigma-delta AD converter using switched-capacitors approach. Model of the ideal and real architecture of the third order sigma-delta modulator was designed in MATLAB SIMULINK. The comparison of the ideal and real model of sigma delta architecture is described in this thesis. On the basis of simulation results in MATLAB SIMULINK the stages of modulator on transistors level in CMOS technology were designed. Fully differential operational amplifier, switched capacitor integrator, summing amplifier, comparator, one bit digital to analog converter and nonoverlapping clock generator were designed. The circuit of third order sigma-delta modulator was simulated in CADENCE. Layout of operational amplifier and switched capacitor integrator was made. Through the use of MATLAB was designed decimation filter as well.
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