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# RF Design Solutions

RF Design Solutions

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## Conversion of Differential Signal to Single Ended Signal

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#### Atif Hussain Shah

##### Member level 1
Will 1:1 Balun give a 3dB gain at output when the input is a differential signal?
The differential impedance is 50 ohm and single ended impedance is also 50ohm

#### BigBoss

BalUns don't provide Gain, instead they have losses..

#### Atif Hussain Shah

##### Member level 1
BalUns don't provide Gain, instead they have losses..
But when balun is used for converting differential signal to single ended signal, 3dB gain is achieved at output

#### FvM

##### Super Moderator
Staff member
How do you derive this? RF signals are usually measured as power, e.g. in dBm. A lossless balun can have at best output power equal input power. In case of 1:1 balun, this corresponds to equal in- and output voltage.

#### Atif Hussain Shah

##### Member level 1
How do you derive this? RF signals are usually measured as power, e.g. in dBm. A lossless balun can have at best output power equal input power. In case of 1:1 balun, this corresponds to equal in- and output voltage.
Yes in case of 1:1 balun the output power will be equal to input power
But in case of 1:2 balun what will be the output power.
Basically i want to ask/confirm that as Balun has conversion loss and for 1:2 balun the conversion loss will be 3dB less than for 1:1 Balun

#### FvM

##### Super Moderator
Staff member
Ouput power is always input power minus losses. Voltages are different depending on the impedance ratio.

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