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Bipin Tripathi Kumaon Institute of Technology (BTKIT), Dwarahat
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Carry-Skip Adder Delay Solution

STEP 0: Pre-Calculation Summary
Formula Used
carry_skip_adder_delay = propagation delay+2*(n-input AND gate-1)*Delay of the AND-OR gate+(K-input AND gate-1)*Multiplexer Delay+xor delay
tskip = τ+2*(n-1)*tAO+(k-1)*tmux+Txor
This formula uses 6 Variables
Variables Used
propagation delay- propagation delay is the amount of time it takes for the head of the signal to travel from the sender to the receiver.
n-input AND gate- n-input AND gate is n number of and gate
Delay of the AND-OR gate - Delay of the AND-OR gate in the gray cell (Measured in Second)
K-input AND gate- K-input AND gate is the k input
Multiplexer Delay- Multiplexer Delay exhibits minimum number of pmos and nmos, minimum delay and minimum power dissipation.
xor delay - xor delay is delay of the final sum XOR (Measured in Second)
STEP 1: Convert Input(s) to Base Unit
propagation delay: 20 --> No Conversion Required
n-input AND gate: 2 --> No Conversion Required
Delay of the AND-OR gate: 5 Second --> 5 Second No Conversion Required
K-input AND gate: 7 --> No Conversion Required
Multiplexer Delay: 4 --> No Conversion Required
xor delay: 8 Second --> 8 Second No Conversion Required
STEP 2: Evaluate Formula
Substituting Input Values in Formula
tskip = τ+2*(n-1)*tAO+(k-1)*tmux+Txor --> 20+2*(2-1)*5+(7-1)*4+8
Evaluating ... ...
tskip = 62
STEP 3: Convert Result to Output's Unit
62 --> No Conversion Required
FINAL ANSWER
62 <-- Carry-Skip Adder Delay
(Calculation completed in 00.016 seconds)

10+ CMOS-VLSI Design Calculators

Drain Voltage
drain_voltage = sqrt(dynamic power/frequency*Capacitance) Go
Gate to Channel Voltage
gate_to_channel_voltage = (Channel Charge/Gate Capacitance)+Threshold voltage Go
Threshold Voltage
threshold_voltage = Gate to Channel Voltage-(Channel Charge/Gate Capacitance) Go
Gate Capacitance
channel_charge = Gate Capacitance*(Gate to Channel Voltage-Threshold voltage) Go
Channel Charge
channel_charge = Gate Capacitance*(Gate to Channel Voltage-Threshold voltage) Go
Capacitor dynamic power
dynamic_power = Drain Voltage^2*frequency*Capacitance Go
Potential gate to Collector
potential_gate_to_collector = (Potential Gate to Source+Potential Gate to Drain)/2 Go
Potential Gate to Drain
potential_gate_to_drain = 2*potential gate to collector-Potential Gate to Source Go
Static Current
static_current = Static power/Drain Voltage Go
Static Power Dissipation
static_power = static current*Drain Voltage Go

Carry-Skip Adder Delay Formula

carry_skip_adder_delay = propagation delay+2*(n-input AND gate-1)*Delay of the AND-OR gate+(K-input AND gate-1)*Multiplexer Delay+xor delay
tskip = τ+2*(n-1)*tAO+(k-1)*tmux+Txor

What is Charge Sharing? Explain the Charge Sharing problem while sampling data from a Bus?

In the serially connected NMOS logic the input capacitance of each gate shares the charge with the load capacitance by which the logical levels drastically mismatched than that of the desired once. To eliminate this load capacitance must be very high compared to the input capacitance of the gates (approximately 10 times).

How to Calculate Carry-Skip Adder Delay?

Carry-Skip Adder Delay calculator uses carry_skip_adder_delay = propagation delay+2*(n-input AND gate-1)*Delay of the AND-OR gate+(K-input AND gate-1)*Multiplexer Delay+xor delay to calculate the Carry-Skip Adder Delay, The Carry-Skip Adder Delay formula is defined as the critical path of CPAs considered so far involves a gate or transistor for each bit of the adder, which can be slow for large adders. Carry-Skip Adder Delay and is denoted by tskip symbol.

How to calculate Carry-Skip Adder Delay using this online calculator? To use this online calculator for Carry-Skip Adder Delay, enter propagation delay (τ), n-input AND gate (n), Delay of the AND-OR gate (tAO), K-input AND gate (k), Multiplexer Delay (tmux) and xor delay (Txor) and hit the calculate button. Here is how the Carry-Skip Adder Delay calculation can be explained with given input values -> 62 = 20+2*(2-1)*5+(7-1)*4+8.

FAQ

What is Carry-Skip Adder Delay?
The Carry-Skip Adder Delay formula is defined as the critical path of CPAs considered so far involves a gate or transistor for each bit of the adder, which can be slow for large adders and is represented as tskip = τ+2*(n-1)*tAO+(k-1)*tmux+Txor or carry_skip_adder_delay = propagation delay+2*(n-input AND gate-1)*Delay of the AND-OR gate+(K-input AND gate-1)*Multiplexer Delay+xor delay. propagation delay is the amount of time it takes for the head of the signal to travel from the sender to the receiver, n-input AND gate is n number of and gate, Delay of the AND-OR gate in the gray cell, K-input AND gate is the k input, Multiplexer Delay exhibits minimum number of pmos and nmos, minimum delay and minimum power dissipation and xor delay is delay of the final sum XOR.
How to calculate Carry-Skip Adder Delay?
The Carry-Skip Adder Delay formula is defined as the critical path of CPAs considered so far involves a gate or transistor for each bit of the adder, which can be slow for large adders is calculated using carry_skip_adder_delay = propagation delay+2*(n-input AND gate-1)*Delay of the AND-OR gate+(K-input AND gate-1)*Multiplexer Delay+xor delay. To calculate Carry-Skip Adder Delay, you need propagation delay (τ), n-input AND gate (n), Delay of the AND-OR gate (tAO), K-input AND gate (k), Multiplexer Delay (tmux) and xor delay (Txor). With our tool, you need to enter the respective value for propagation delay, n-input AND gate, Delay of the AND-OR gate, K-input AND gate, Multiplexer Delay and xor delay and hit the calculate button. You can also select the units (if any) for Input(s) and the Output as well.
How many ways are there to calculate Carry-Skip Adder Delay?
In this formula, Carry-Skip Adder Delay uses propagation delay, n-input AND gate, Delay of the AND-OR gate, K-input AND gate, Multiplexer Delay and xor delay. We can use 10 other way(s) to calculate the same, which is/are as follows -
  • dynamic_power = Drain Voltage^2*frequency*Capacitance
  • drain_voltage = sqrt(dynamic power/frequency*Capacitance)
  • static_power = static current*Drain Voltage
  • static_current = Static power/Drain Voltage
  • channel_charge = Gate Capacitance*(Gate to Channel Voltage-Threshold voltage)
  • channel_charge = Gate Capacitance*(Gate to Channel Voltage-Threshold voltage)
  • gate_to_channel_voltage = (Channel Charge/Gate Capacitance)+Threshold voltage
  • threshold_voltage = Gate to Channel Voltage-(Channel Charge/Gate Capacitance)
  • potential_gate_to_collector = (Potential Gate to Source+Potential Gate to Drain)/2
  • potential_gate_to_drain = 2*potential gate to collector-Potential Gate to Source
Where is the Carry-Skip Adder Delay calculator used?
Among many, Carry-Skip Adder Delay calculator is widely used in real life applications like {FormulaUses}. Here are few more real life examples -
{FormulaExamplesList}
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