Continue to Site

Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Register Log in

A fundamental question about VGA/PGA design

Status
Not open for further replies.
H

henrywent

Member level 5
Joined
Dec 29, 2008
Messages
83
Helped
5
Reputation
10
Reaction score
5
Trophy points
1,288
Location
china
Activity points
1,869
hello there,
why constant bandwidth across the gain range is required in VGA/PGA design, what if the bandwidths of different gain settings are different ? Is there a fundamental principle behind this, any comment is welcome.
 

In VGA, it is necessary to have a settling time that is independent of the input amplitude inorder to complete the VGA operation optimally w.r.t time. Suppose if it is not followed, when the amplitude is smaller, the required gain will be high and a constant gain bandwidth would take long time before the next block can process the signal.
 

Yes,

In VGA/PGA output settling time should be independent of input amplitude.

Bye.
 

Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top