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## Credits

Birsa Institute of Technology (BIT), Sindri
Payal Priya has created this Calculator and 500+ more calculators!
Vishwakarma Government Engineering College (VGEC), Ahmedabad
Urvi Rathod has verified this Calculator and 1000+ more calculators!

STEP 0: Pre-Calculation Summary
Formula Used
3_db_frequency = 1/((2*pi)*(Capacitance+Capacitance gate to drain)*(1/Load resistance+1/Output resistance))
fH = 1/((2*pi)*(C+Cgd)*(1/Rl+1/Ro))
This formula uses 1 Constants, 4 Variables
Constants Used
pi - Archimedes' constant Value Taken As 3.14159265358979323846264338327950288
Variables Used
Capacitance - Capacitance is the ratio of the amount of electric charge stored on a conductor to a difference in electric potential. (Measured in Farad)
Capacitance gate to drain - Capacitance gate to drain is capacitance (Measured in Farad)
Load resistance - Load resistance is the resistance value of load given for the network (Measured in Kilohm)
Output resistance - Output resistance is the value of resistance of the network (Measured in Ohm)
STEP 1: Convert Input(s) to Base Unit
Capacitance gate to drain: 3 Farad --> 3 Farad No Conversion Required
Load resistance: 1 Kilohm --> 1000 Ohm (Check conversion here)
Output resistance: 200 Ohm --> 200 Ohm No Conversion Required
STEP 2: Evaluate Formula
Substituting Input Values in Formula
fH = 1/((2*pi)*(C+Cgd)*(1/Rl+1/Ro)) --> 1/((2*pi)*(3+3)*(1/1000+1/200))
Evaluating ... ...
fH = 4.42097064144154
STEP 3: Convert Result to Output's Unit
4.42097064144154 Hertz --> No Conversion Required
4.42097064144154 Hertz <-- 3-dB Frequency
(Calculation completed in 00.016 seconds)

## < 10+ High-Frequency Response of the MOS Cascode Amplifier Calculators

Effective time-constant of the cascode amplifier
effective_high_frequency_time_constant = (Capacitance gate to source*Signal Resistance)+Capacitance gate to drain*((1+(Transconductance*drain resistance)*Signal Resistance)+drain resistance)+(Drain-body Capacitance+Capacitance gate to source)*drain resistance+(Capacitance+Capacitance gate to drain)*(1/Load resistance+1/Output resistance) Go
Effective time-constant of the MOS cascode amplifier
time_constant = (Signal Resistance*(Capacitance gate to source+Capacitance gate to drain*(1+(Transconductance*drain resistance))))+drain resistance*(Capacitance gate to drain+Drain-body Capacitance+Capacitance gate to source)+(1/Load resistance+1/Output resistance)*(Capacitance+Capacitance gate to drain) Go
Output resistance of the cascode amplifier
resistance_output = Resistance of Secondary winding in primary+Resistance of Primary winding in Secondary+(Transconductance*Resistance of Secondary winding in primary)*Resistance of Primary winding in Secondary Go
3_db_frequency = 1/((2*pi)*(Capacitance+Capacitance gate to drain)*(1/Load resistance+1/Output resistance)) Go
Gate to drain resistance in the cascode amplifier
resistance_gate_to_drain = (1+(Transconductance*drain resistance))*Signal Resistance+drain resistance Go
time_constant = (Capacitance+Capacitance gate to drain)*(1/Load resistance+1/Output resistance) Go
Unity gain frequency of the MOS cascode amplifier
unity_gain_frequency = Transconductance/((2*pi)*(Capacitance+Capacitance gate to drain)) Go
Signal current in the base
signal_current_in_the_base = (MOSFET Transconductance/Common emitter current gain)*Small Signal Go
Drain resistance in the cascode amplifier
drain_resistance = 1/Finite input resistance+1/Input resistance Go
3-dB frequency of the cascode amplifier
3_db_frequency = 1/(2*pi*Time constant) Go

3_db_frequency = 1/((2*pi)*(Capacitance+Capacitance gate to drain)*(1/Load resistance+1/Output resistance))
fH = 1/((2*pi)*(C+Cgd)*(1/Rl+1/Ro))

## What is the difference between Cascade and Cascode amplifier?

In a cascade amplifier, the transistors are arranged like a chain that is the output of the first transistor is connected as input for the second transistor. While in a cascode amplifier, the transistor is placed one above the other.

3-dB frequency in design insight and trade-off calculator uses 3_db_frequency = 1/((2*pi)*(Capacitance+Capacitance gate to drain)*(1/Load resistance+1/Output resistance)) to calculate the 3-dB Frequency, The 3-dB frequency in design insight and trade-off formula is defined as usually denoted by the Greek letter τ (tau), which is the parameter characterizing the response to a step input of a first-order, linear time-invariant (LTI) system. The time constant is the main characteristic unit of a first-order LTI system. 3-dB Frequency and is denoted by fH symbol.

How to calculate 3-dB frequency in design insight and trade-off using this online calculator? To use this online calculator for 3-dB frequency in design insight and trade-off, enter Capacitance (C), Capacitance gate to drain (Cgd), Load resistance (Rl) and Output resistance (Ro) and hit the calculate button. Here is how the 3-dB frequency in design insight and trade-off calculation can be explained with given input values -> 4.420971 = 1/((2*pi)*(3+3)*(1/1000+1/200)).

### FAQ

The 3-dB frequency in design insight and trade-off formula is defined as usually denoted by the Greek letter τ (tau), which is the parameter characterizing the response to a step input of a first-order, linear time-invariant (LTI) system. The time constant is the main characteristic unit of a first-order LTI system and is represented as fH = 1/((2*pi)*(C+Cgd)*(1/Rl+1/Ro)) or 3_db_frequency = 1/((2*pi)*(Capacitance+Capacitance gate to drain)*(1/Load resistance+1/Output resistance)). Capacitance is the ratio of the amount of electric charge stored on a conductor to a difference in electric potential, Capacitance gate to drain is capacitance, Load resistance is the resistance value of load given for the network and Output resistance is the value of resistance of the network.
The 3-dB frequency in design insight and trade-off formula is defined as usually denoted by the Greek letter τ (tau), which is the parameter characterizing the response to a step input of a first-order, linear time-invariant (LTI) system. The time constant is the main characteristic unit of a first-order LTI system is calculated using 3_db_frequency = 1/((2*pi)*(Capacitance+Capacitance gate to drain)*(1/Load resistance+1/Output resistance)). To calculate 3-dB frequency in design insight and trade-off, you need Capacitance (C), Capacitance gate to drain (Cgd), Load resistance (Rl) and Output resistance (Ro). With our tool, you need to enter the respective value for Capacitance, Capacitance gate to drain, Load resistance and Output resistance 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 3-dB Frequency?
In this formula, 3-dB Frequency uses Capacitance, Capacitance gate to drain, Load resistance and Output resistance. We can use 10 other way(s) to calculate the same, which is/are as follows -
• resistance_gate_to_drain = (1+(Transconductance*drain resistance))*Signal Resistance+drain resistance
• drain_resistance = 1/Finite input resistance+1/Input resistance
• resistance_output = Resistance of Secondary winding in primary+Resistance of Primary winding in Secondary+(Transconductance*Resistance of Secondary winding in primary)*Resistance of Primary winding in Secondary
• effective_high_frequency_time_constant = (Capacitance gate to source*Signal Resistance)+Capacitance gate to drain*((1+(Transconductance*drain resistance)*Signal Resistance)+drain resistance)+(Drain-body Capacitance+Capacitance gate to source)*drain resistance+(Capacitance+Capacitance gate to drain)*(1/Load resistance+1/Output resistance)
• 3_db_frequency = 1/(2*pi*Time constant)
• time_constant = (Signal Resistance*(Capacitance gate to source+Capacitance gate to drain*(1+(Transconductance*drain resistance))))+drain resistance*(Capacitance gate to drain+Drain-body Capacitance+Capacitance gate to source)+(1/Load resistance+1/Output resistance)*(Capacitance+Capacitance gate to drain)
• time_constant = (Capacitance+Capacitance gate to drain)*(1/Load resistance+1/Output resistance)
• 3_db_frequency = 1/((2*pi)*(Capacitance+Capacitance gate to drain)*(1/Load resistance+1/Output resistance))
• unity_gain_frequency = Transconductance/((2*pi)*(Capacitance+Capacitance gate to drain))
• signal_current_in_the_base = (MOSFET Transconductance/Common emitter current gain)*Small Signal