manuel_trekker
Newbie level 5
Hello,
I have to make a 90º shifter in 25-40MHz.
I'll use it as I/Q baseband signals of an I/Q modulator.
On I/Q modulator, the phase difference and amplitude balance between I signal and Q signal are very important. For optimum performance, this phase difference and balance must be low, less than 3degrees and 0.5dB for at least -30dBc of sideband supression.
The simplest circuit is a RC - CR, but for this wideband it's not adecuate on phase and amplitude performance.
Another option is use operational amplifier. I'm not sure, but I think that it's to high frequency.
Can anyone help me?
Thanks in advance.
MANUEL
I have to make a 90º shifter in 25-40MHz.
I'll use it as I/Q baseband signals of an I/Q modulator.
On I/Q modulator, the phase difference and amplitude balance between I signal and Q signal are very important. For optimum performance, this phase difference and balance must be low, less than 3degrees and 0.5dB for at least -30dBc of sideband supression.
The simplest circuit is a RC - CR, but for this wideband it's not adecuate on phase and amplitude performance.
Another option is use operational amplifier. I'm not sure, but I think that it's to high frequency.
Can anyone help me?
Thanks in advance.
MANUEL