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How many h-parameters are there for a transistor?

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How many h-parameters are there for a transistor?

(a) two

(b) three

(c) four

(d) five

The question was asked in homework.

I need to ask this question from Transistor Hybrid Model topic in portion Small-Signal Low-Frequency AC models of Transistors of Electronic Devices & Circuits

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Best answer
Correct answer is (c) four

Best explanation: A transistor has four h-parameters –

H11 = V1/i1              (Input Impedance with output short circuited)

H21 = i2/i1              (Current gain with output short circuited)

H12 = V1/V2             (Voltage gain with feedback ratio with input terminals open)

H22 = i2/V2             (Output Admittance with input terminals open).

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