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Transconductance is the ratio of the change in current at the output terminal to the change in the voltage at the input terminal of an active device. It is a key parameter in characterizing the performance of transistors and other electronic devices.
The calculator uses the formula:
Where:
Explanation: The formula calculates the transconductance by dividing the collector current by the threshold voltage of the transistor.
Details: Transconductance is a crucial parameter in amplifier design and analysis. It determines the gain and linearity characteristics of transistor-based circuits and helps in understanding the small-signal behavior of electronic devices.
Tips: Enter collector current in Amperes and threshold voltage in Volts. Both values must be positive numbers greater than zero for accurate calculation.
Q1: What is the unit of transconductance?
A: Transconductance is measured in Siemens (S), which is equivalent to Amperes per Volt (A/V).
Q2: How does transconductance relate to amplifier gain?
A: In many amplifier configurations, the voltage gain is directly proportional to the transconductance of the active device and the load impedance.
Q3: What factors affect transconductance in transistors?
A: Transconductance depends on the device geometry, material properties, operating temperature, and bias conditions of the transistor.
Q4: Is this formula applicable to all types of transistors?
A: While the basic concept applies to various transistor types, the specific relationship between collector current and threshold voltage may vary for different transistor technologies (BJT, MOSFET, etc.).
Q5: What are typical values of transconductance?
A: Transconductance values can range from microsiemens (μS) for small-signal devices to several siemens for high-power transistors, depending on the application and device characteristics.