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Re: How to implement VGA whose accruacy is smaller than 0.1d
Hi
The gain(control voltage,temperature) dependence is nonlinear in common case
You can store this dependence in memory and then control your amp
It will be digital controled amplifier exactly.
Re: How to implement VGA whose accruacy is smaller than 0.1d
Grig said:
Hi
The gain(control voltage,temperature) dependence is nonlinear in common case
You can store this dependence in memory and then control your amp
It will be digital controled amplifier exactly.
Re: How to implement VGA whose accruacy is smaller than 0.1d
To make digital VGA accurate use the matching principle in IC process!
The idea is to switch between different matched devices in a process to define the gain. The simplest form is an opamp configuration. If the gain at target frequency is high enough the gain could be simply defined by switched resistors.
But you did not mention if the VGA applies to RF or IF!!!
Re: How to implement VGA whose accruacy is smaller than 0.1d
rfsystem said:
To make digital VGA accurate use the matching principle in IC process!
The idea is to switch between different matched devices in a process to define the gain. The simplest form is an opamp configuration. If the gain at target frequency is high enough the gain could be simply defined by switched resistors.
But you did not mention if the VGA applies to RF or IF!!!
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