Digital Logic Inverter Operations
Explore the classification of circuits, voltage-transfer characteristics, noise margins, power dissipation, and propagation delays in digital logic inverters. Learn about the key parameters and characteristics that define the behavior of inverters in electronic circuits.
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Presentation Transcript
Clasificacion de Circuitos y frecuencia maxima Digital Logic Inverter
The Voltage-Transfer Characteristic (VTC) The function of the inverter is to invert the logic value of its input signal The voltage-transfer characteristic is used to evaluate the quality of inverter operation o VTC parameters VOH: output high level VOL: output low level VIH: the minimum value of input interpreted by the inverter as a logic 1 VIL: the maximum value of input interpreted by the inverter as a logic 0 Transition region: input level between VIL and VIH
Noise Margins The VTC is generally non-linear VIH and VIL are defined as the points at which the slope of the VTC is =-1 Robustness (noise margin at a high level): NMH = VOH - VIH Robustness (noise margin at a low level): NML = VIL - VOL Static inverter characteristics for ideal VTC: VOH = VDD VOL = 0 VIH = VIL = VDD/2 NMH = NML = VDD/2
Power Dissipation 2 fCV P = DD 2 D Static power dissipation: power dissipated when the inverter stays in logic 0 or logic 1 Dynamic power dissipation: power dissipated as the output is switching
t ( )RC e = ( ) v t V V V Propagation Delay + 0 o tPHL: high-to-low propagation delay tPLH: low-to-high propagation delay tP(propagation delay) = (tPLH + tPHL)/2 Maximum switching frequency fmax= 1/(2tP) The transient of the inverter can be characterized by a RC charge/discharge model
