Flash Memory …and a tour through FETs. Junction Field Effect Transistor.

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Presentation transcript:

Flash Memory …and a tour through FETs

Junction Field Effect Transistor

Metal Oxide Semiconductor Field Effect Transistor

Actual MOSFET Devices Single MOSFET on Intel chipEnhancement MOSFET

MOSFET Motor Control Circuit componentMotor Control Circuit

Floating Gate MOSFET = Flash Assume: V DS =V D - V S =+12V What happens if?: V GS =V G – V S= +12 V Then what happens?: to ‘jailed’ electrons if V GS is set to 0V?

Reading Memory State Change in Threshold Voltage due to Screening Effect of Floating Gate Read mode: Apply intermediate voltage, check whether current is flowing or not

Writing Memory State Control gate voltage determines whether electrons are injected to, or push/pulled out of floating gate.

Block Structure

Writing block structure: The ole 2-step Step 1: Set all bits to 1 (clear out electrons from floating gate) Step 2: Set selected bits to 0 (inject electrons from control to floating gate) 1 2

Voila – flash memory stick

Citations/Image Sources (JFETs) OSFET OSFET (MOSFET motor control) ssds-and-you/ ssds-and-you/ (hyperscience youtube channel – reading flash contents)