LF, Maybe someone can help me with an open question about IQ Mixers: I want to build a mixer that generates a rectangular output at 137.7 kHz (to steer my LF PA) by using SL's digimode terminal at 12
Dear Stefan, LF Group, So what is missed in my circuit is the allpass network that makes a 90 deg delay of the input signal. ...Unless the software generates I/Q outputs from the sound card L/R stere
Dear Stefan, LF Group, So what is missed in my circuit is the allpass network that makes a 90 deg delay of the input signal. ...Unless the software generates I/Q outputs from the sound card L/R stere
I've read some more articles and now my understanding is that: -There are 4 drive signals, each 90 deg shifted to each other, switching 4 analog switches (e.g. CD4066). -The 4 signals can be seen as
Hello Jim, LF, Am 19.07.2011 23:11, schrieb James Moritz: Scale the values of either R or C proportional to the inverse of the centre frequency (or both - it is 1/RC time constant you need to scale).
Tnx Roelof and Jim for help and comments! Jim, some questions: Am 18.07.2011 19:17, schrieb James Moritz: Dear Stefan, LF Group, So what is missed in my circuit is the allpass network that makes a 90
For an IQ upconverter, you need two mixers fed with SIN and COS (90 deg separated waveforms) as well as 90 degree shifted baseband inputs from a PC or audio phase shift network. Then by adding or
Hello Andy, Thanks for the excellent link, work and documentation! This helps a lot. It confirms some steps and thoughts and adds a few one. So what is missed in my circuit is the allpass network tha
