## How is VIH and VIL calculated?

low voltage and input-high voltages are:

- VIL = 2.5 V – (1/5) (2.5 V) = 2 V. VIH = 2.5 V + (1/5) (2.5 V) =3 V.
- The low and high noise margins are therefore: NML = VIL – VOL = 2 – 0 = 2 V.
- NMH = VOH – VIH =5 – 3 = 2 V. The transition region (or “gray area”) is the interval.
- VIL < VIN < VIH. or 2 V < VIN < 3 V.

**What should be the ideal value for VIH Vil?**

0

Vil = 0 Ideally, when input voltage is logic ‘1’, output voltage is supposed to be at logic ‘0’. Hence, Vih (V input high) is ‘Vdd’, and Vol (V output low) is ‘0’V.

**What is noise margin formula?**

The noise margin, NMH = |VOH min – VIH min|, for logical high is the range of tolerance for which a logical high signal can still be received correctly. The same can be said with noise margin, NML = |VIL max – VOL max|, for logical low, which specifies the range of tolerance for logical low signals on the wire.

### What is Vil in CMOS?

VIL: Maximum input voltage that will be recognised as a low input logic level. VIH: Minimum input voltage that will be recognised as a high input logic level.

**How do you maximize the noise margin?**

To maximize the noise margin, we take the first derivative of f(x) and set it to zero: f'(x) = 1 – 2x = 0. Solving for x gives 0.5. Thus, VIL = x = 0.5V, and VOL = x2 = 0.25V.

**What is the relation between threshold voltage and noise margin?**

As shown in Fig. 5, for any given threshold voltage V T , the noise margin can always be increased by increasing the supply voltage. This means that the robustness of the circuit can be improved at the expense of a larger power consump- tion.

## What is the standard TTL noise margin?

Detailed Solution

TTL | ECL | |
---|---|---|

Fan-Out | 10 | 25 |

Power Dissipation (mW) | 10 | 175 |

Noise Margin | 0.4 V | 0.16 V (lowest) |

Propagation Delay | 10 | < 3 (lowest) |

**What is the noise margin in logic gates related to?**

In practice, noise margins are the amount of noise, that a logic circuit can withstand. Noise margins are generally defined so that positive values ensure proper operation, and negative margins result in compromised operation, or outright failure.

**Is CMOS an inverter?**

CMOS inverters (Complementary NOSFET Inverters) are some of the most widely used and adaptable MOSFET inverters used in chip design. It will cover input/output characteristics, MOSFET states at different input voltages, and power losses due to electrical current.