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Voltage Transfer Characteristics (VTC)
Vth: Inverter Threshold Voltage
0 < Vin < Vth Vout=‘1’
Vth < Vin < VDD Vout=‘0’
as the name implies, the invertor inverts the value of its input signal.
if input is 0 (low), then output is V+ (high)
if input is V+ (high), then output is 0 (low)
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