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Design of A Digitally Controlled Bias Chip For A Transceiver

Yaghoobi Zanjani, Majid | 2013

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 45090 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Medi, Ali; Sheikhaei, Samad
  7. Abstract:
  8. Advances in IC fabrication makes possible have systems on chips. In this thesis we have designed and fabricated a digitally controlled bias chip for a transceiver which can be programmed by its digital interface. In this thesis, briefly we review basics of voltage regulators and methods for controlling them. Then we introduce high voltage 0.18um CMOS technology. In this thesis, we describe the requirements of a specific transceiver and present a system to overcome these requirements. This system has positive, negative and internal regulators, a five-bit analog to digital converter, temperature sensors, power amplifier controller and digital serial interface. In this thesis, we present a circuit level design to realize our system. We have positive switching and linear regulators which have voltages of 3.3, 8, 1.2 or 3.3 and 5 volts with currents between 500 to 1000 mA. For negative regulators we have voltages of -0.8, -3.5, -7, -10 volts with currents between 50 to 100 mA. These regulators work with frequency range of 0.1 to 1.5 MHz and it can be changed digitally. For Protection we have short circuit detection, over voltage and under voltage detection, over current detection and over temperature detection for each regulator. Each of these detections produces an interrupt for microcontroller. Besides these regulators, we also have internal regulators which produce 1.8, 4 and 5 volts. these regulators also have a band gap voltage reference with produces 1.25 V. At last we have a digital section, which contains a 5-bit flash analog to digital convertor and a digital interface in order to be controlled by a microcontroller such as FPGA
  9. Keywords:
  10. Power Supply ; Voltage Regulator ; Transmitter Receivers ; High Voltage CMOS Technology ; Data Converters ; Band Gap Voltage Reference ; Switching ; Field Programmable Gate Array (FPGA)

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