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Voltage Gain in the Grounded Collector ConnectionAuthor: Leonard Krugman The voltage gain, as defined in equation 3-24 by the general four-terminal parameters is: Under the conditions for infinite input resistance and infinite current gain (RL = -r22), the voltage gain becomes: For a perfect buffer stage Rc + rc- rm = 0. Thus, the voltage gain equation becomes The maximum voltage gain as defined by equation 3-25 is ; this becomes. For the typical point-contact transistor, when RL = 15,000 ohms and Rg = 10 ohms, Under the conditions RL = -r22 = 11,850 ohms VG = = .985 Under the conditions Rc + rc = rm (Rc = 12,000 ohms) The maximum voltage gain For the typical junction transistor, RL = 100,000 ohms, Rg = 10 ohms The maximum voltage gain Notice that in all of the above cases, the voltage gain is slightly less than unity. This is typical of the grounded collector connection.
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Home Grounded Emitter and Grounded Collector Transistors The Grounded Collector Connection Voltage Gain |