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[SOLVED] Understanding Power Supply bandwidth

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ahsoopk

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Dear all,

I am trying to understand envelop tracking system and not grasping the concept of power supply bandwidth. my power amplifier will be working between 8GHz and 10GHz but instantanious channel bandwitdh is 100MHz. so how does my oprating bandwidth relate to power supply bandwidth, since power supply will be providing the DC to the drain of my PA.

apology for basic level question but i am have no idea about power supply design or concepts.

I will appreciate if someone could explain it from first principal and beginners point of view.

thanks in advance for help.

kind regards,

Malik
 

Hi,

The bandwidth of a power supply is its crossover frequency. It determines how fast the powersupply can respond to low-frequency pertubations.
 

Akanimo said:
Hi,

The bandwidth of a power supply is its crossover frequency. It determines how fast the powersupply can respond to low-frequency pertubations.
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Thanks for your reply, I understand the concept of crossover frequency but I am lost after that.. if the bandwidth is wide does it mean it will respond slowly and if bandwidth is narrow then it will repond quickly, am I correct by saying that?
 

The wider the bandwidth, the higher the low-frequency gain that you can attend. The higher the low-frequency gain, the better the low-frequency perturbations are attenuated. This is evident when you consider 1/(1+T), where T is the loop gain. So, it will respond quickly if the bandwidth is wide.
 
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