Operating point and Load line

Operating point and Load line

Vcc=IcRc+Vce

for Vce=0
Ic=Vcc/Rc

for Ic=0
Vce=Vcc

The line joining between Vcc/Rc and Vcc is known as static load line/DC load line. the point at which the dc load line meets with the characteristic line in the active region is known as Q point / quiescent point/operating point
The parallel line passing through q point is the AC load line . The transistor characteristic reverse that the transistor operation is most linear when it is constrained to operate in its active region by providing dc potential and current by using external sources
An important selected operating point results in a output signal wave form is not a faithful reproduction of the input signal waveform ,such operating point unsatisfactory and should be re positioned on the collector point in vital for linear amplification

Bias stability
the operating point stability may be influenced by the following characteristics factors
1)Change in trasistor
2)Thermal instability(Change in temperature)