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H21 Parameter Formula:
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The H21 Parameter is the short-circuit current gain in a two-port network, representing the ratio of output current to input current under short-circuit conditions at the output port.
The calculator uses the H21 Parameter formula:
Where:
Explanation: The H21 parameter is calculated as the ratio of the output current (port 2) to the input current (port 1) when the output port is short-circuited.
Details: The H21 parameter is crucial in analyzing two-port networks, particularly in transistor amplifier circuits where it represents the current gain. It helps in characterizing the performance and behavior of electronic devices.
Tips: Enter the current values in amperes for both port 1 and port 2. Ensure that the current in port 1 is greater than zero for valid calculation.
Q1: What does H21 parameter represent?
A: H21 parameter represents the short-circuit current gain in a two-port network, indicating how much the output current amplifies relative to the input current.
Q2: When is H21 parameter used?
A: H21 parameter is commonly used in transistor circuit analysis, particularly for characterizing the current gain in common-emitter configurations.
Q3: What are typical values for H21 parameter?
A: For bipolar junction transistors, H21 (often denoted as hfe) typically ranges from 20 to 1000, depending on the transistor type and operating conditions.
Q4: How does H21 differ from other h-parameters?
A: H21 specifically measures current gain, while other h-parameters measure different characteristics such as input impedance (h11), reverse voltage gain (h12), and output admittance (h22).
Q5: Can H21 parameter be negative?
A: Typically, H21 is positive for most amplifying devices, but in certain configurations or for specific devices, it could be negative indicating phase inversion.