Electrical Communication is a free textbook on the basics of communication technology. See the editorial for more information....

Home Electronic Applications in Communication Equivalent Circuit of a Vacuum Tube
 
del.icio.us Reddit Facebook StumbleUpon MySpace Twitter Search the VIAS Library  |  Index

Equivalent Circuit of a Vacuum Tube

When used as a non-distorting amplifier, the signal voltage to be amplified is impressed between the grid and the cathode, and these signal voltage variations cause corresponding signal-current flow in the plate circuit. Because the grid voltage is more effective than the plate voltage in controlling plate-current flow, the equivalent circuit of a vacuum tube16 as an amplifier is shown in Fig. 17. The alternating signal current that flows through the load resistor is

Equivalent circuit of a vacuum-tube amplifier
Figure 17. Equivalent circuit of a vacuum-tube amplifier.

The signal voltage across RL is

The voltage amplification, or voltage gain, of the circuit is

which may be expressed in decibels if desired. The power delivered to the load resistor RL is


Home Electronic Applications in Communication Equivalent Circuit of a Vacuum Tube

Last Update: 2011-05-18