Sökning: "quadrature modulator"
Visar resultat 1 - 5 av 13 avhandlingar innehållade orden quadrature modulator.
1. Design and Characterization of D-band Monolithic Direct Carrier Modulator and Demodulator Circuits for High Speed Wireless Communication
Sammanfattning : Millimeter waves are finding increasing applications in data communication, sensing,imaging and radio astronomy. One application is in high-speed wireless back-haul networksfor mobile communication. The operators are interested in replacing optical fiber withthe more flexible and easy to deploy wireless link. LÄS MER
2. Linear Interpolation D/A Converter Applied to Direct Digital RF Modulators
Sammanfattning : This thesis deals with techniques for the full integration of radio frequency (RF) transmitter with CMOS technology. The theory and implementation of high performance digital-to-analog converters (DACs) for radio frequency (RF) transmitters have been studied. A linear interpolation DAC architecture is proposed. LÄS MER
3. Wideband Sigma-Delta Modulators
Sammanfattning : Sigma-delta modulators (SDM) have come up as an attractive candidatefor analog-to-digital conversion in single chip front ends thanks to the continuousimproving performance. The major disadvantage is the limited bandwidthdue to the need of oversampling. LÄS MER
4. CMOS Data Converters for Closed-Loop mmWave Transmitters
Sammanfattning : With the increased amount of data consumed in mobile communication systems, new solutions for the infrastructure are needed. Massive multiple input multiple output (MIMO) is seen as a key enabler for providing this increased capacity. With the use of a large number of transmitters, the cost of each transmitter must be low. LÄS MER
5. Millimeter-wave Transceiver ICs for Ultrahigh Data Rate Communications Using Advanced III-V and Silicon Technologies
Sammanfattning : Today’s main driving parameter for radio transceiver research is the ability to provide high capacity while maintaining low cost, small form factor, and low power consumption. Direct conversion architectures (due to the feasibility of monolithic integration) at millimeter-wave (due to wideband availability) have attracted large interest in recent years because of their potential to meet these demands. LÄS MER