# 1dB Compression point

#### Atif Hussain Shah

##### Junior Member level 1
Does p1dB point of Amplifier changes by changing the gain of Amplifier(The gain of Amplifier can be changed by varying Gate Voltage)?

#### vfone

This is not mandatory, but from physical point of view, similar devices with higher gain have lower P1dB point compared with lower gain counterparts.

#### BigBoss

No.. $P_{1dB}$ Point is a metric of Non-linearity so decreasing the Gain will not effect this point. But adjusting $V_{GS}$ will also change the Operating Point so Non-Linearity of the active device.In general, max. $P_{1dB}$ is obtained at one single OP below and above this point Non-Lineairty is highly effected and worsen in aspect of non-linearity.