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Signal Processing with Analog circuit

Signal Processing with Analog circuit. Chun Lo. Analog circuit design. Main disadvantage: low precision Due to mismatch in analog circuit components such as transistors, resistors and capacitors e.g. Amplifiers: lower input signal dynamic range Comparator: lower signal resolution

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Signal Processing with Analog circuit

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  1. Signal Processing with Analog circuit Chun Lo

  2. Analog circuit design • Main disadvantage: low precision • Due to mismatch in analog circuit components such as transistors, resistors and capacitors • e.g. Amplifiers: lower input signal dynamic range Comparator: lower signal resolution Transistors: lower accuracy in current mode DAC • Advantage: • Less power consumption • Possibly smaller area

  3. Mismatch correction • By trimming device • Larger device, layout technique in component mismatch • Autozeroing, correlated double sampling in amplifiers • Cost of extra area, power and design complexity • By in herent programming elements • Floating gate MOSFETs

  4. First paper • Floating Gates Transistors For Precision Analog circuit Design: An Overview • Srinivasan, Graham and Hasler • Second paper • Analog Floating –Gate On chip Auditory Sensing System Interfaces • Hasler, Smith, Graham, Ellis and Anderson

  5. First paper • Structure of Floating Gate MOSFET • Programming floating gate transistors • Programming precision • Charge retention • Application examples of Floating Gate MOSFET • Differential pairs • DAC • ADC

  6. MOSFET • MOS Transistor • Floating Gate MOSFET • The gate is completely surrounded by SiO2 • No DC to ground • Used in Flash memory, ROM

  7. Programming FG-MOSFET • Setting the DC voltage • Add or remove charge • Mainly two methods • Fowler Nordheim tunneling • As a global eraser for all floating gates • Hot electron injection • Program each floating gate to the desired value individually

  8. Programming precision • What is the smallest drain current change • A single electron change results in an accuracy of or 12 bits

  9. Charge Retention • Short term drift • Observed immediately after programming • Proportional to the amount of change that is programmed into the floating gate • Long term charge loss • Themionic emission • Related to both temperature and time

  10. Applications • Differential pair • DAC • ADC

  11. Second paper • Advance in analog VLSI circuits • Performance close to DSP • More option for designeer • Analog Digital Partition • Signal Processing Circuits • Noise Suppression for speech enhancement • Speech Recognition

  12. Analog Digital Partitioning • Power and space • No overhead for tuning and programming • Work in subthreshold save power • SN VS Cost

  13. Analog Signal Processing

  14. Noise suppression • Main Idea: Attenuate the noise components

  15. Speech Recognition • HMMs • States, transition probabilities and • Hidden states are words, output is audio signal produced by speaker • Recognition problem: what is the state of the system

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