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0470-2013

Maximum output voltage level characteristic of a broadband amplifier

Respuesta: 

The maximum output voltage of an amplifier indicates the maximum level that can be obtained at the output of the device ensuring a linear operation, without introducing significant distortion to the input signal.
The linearity of an active element such as an amplifier depends on the type and number of signals at the input, and it varies depending on the modulation type.
In general, the maximum output voltage indicated in the characteristics of an amplifier is measured according to DIN 45004B (EN 50083) which expresses the maximum output level for 2

 

analogue channels of equal amplitude at its input.
If the input signals are all COFDM, the maximum output level must be reduced by 2 dB compared to the level obtained by applying DIN 45004B.
On the other hand, if the number of channels at the input of a broadband amplifier increases, the maximum output level has to be reduced in an

 

amount that is given by this formula:
V maximum output = 7,5log(N-1)
where “N” represents the number of channels.
Therefore, the maximum output level of a broadband amplifier for N COFDM channels is the result of applying the following formula:
Vo max (dBμV) = V DIN45004B – 7,5 log (N-1) – 2 dBμV

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