Loaded Front-End Nodes

Stiffness Changes Decision

loading can flip a later state

Changing source resistance changes the voltage that reaches the decision stage. Exact arithmetic here means exact results for the stated model inputs; measured inputs still carry uncertainty and significant-figure limits.

highlighted = computed this step

The weak source falls below the decision band

The weak source leaves only 4 volts at the input, below the lower threshold of 5 volts.

4 V≤5 V⇒LOW4\ \text{V} \le 5\ \text{V}\Rightarrow \text{LOW}
Weak source decisionThe loaded node falls below the lower threshold.V4 VV5 VV6 VV0 V+-4 V+-5 V+-6 V+-0 Vprior HIGHLOW

The stiff source crosses the upper threshold

The stiff source leaves 8 volts at the input, above the upper threshold of 6 volts.

8 V≥6 V⇒HIGH8\ \text{V} \ge 6\ \text{V}\Rightarrow \text{HIGH}
Stiff source decisionThe loaded node crosses the upper threshold.V8 VV5 VV6 VV12 V+-8 V+-5 V+-6 V+-12 Vprior LOWHIGH