Voltage Gain VG in the Grounded Emitter Connection

Author: Leonard Krugman

The voltage gain was defined by equation (3-24) in terms of the general four-terminal parameters as:

The voltage gain in terms of the transistor parameters for the grounded emitter connection becomes:

Eq. (4-9)*

The maximum voltage gain defined by equation 3-25 is:

which in this case becomes

Eq. (4-9A)

For the point-contact transistor, assuming R_L = 30,000 ohms and R_g = 10 ohms,

and the maximum voltage gain is

For the junction transistor, with R_L = 100,000 ohms and R_g = 10 ohms, the voltage gain is

and the maximum voltage gain is

Notice that the voltage gain in this connection, like the current gain, is negative. Again this merely indicates that the input voltage is inverted in phase.