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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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analog circuit design
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
mismatch correction
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
slide4

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
first paper
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
mosfet
MOSFET
  • MOS Transistor
  • Floating Gate MOSFET
    • The gate is completely surrounded by SiO2
    • No DC to ground
    • Used in Flash memory, ROM
programming fg mosfet
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
programming precision
Programming precision
  • What is the smallest drain current change
  • A single electron change results in an accuracy of or 12 bits
charge retention
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
applications
Applications
  • Differential pair
  • DAC
  • ADC
second paper
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
analog digital partitioning
Analog Digital Partitioning
  • Power and space
    • No overhead for tuning and programming
    • Work in subthreshold save power
  • SN VS Cost
noise suppression
Noise suppression
  • Main Idea: Attenuate the noise components
speech recognition
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