The range from .5 to 2 MHz is an extremely broad frequency range to get
90' using any sort of LC network. It is greater than an octave, and that is
why it's a problem. Generally, most phase shifters cover less than 1
octave....

If you are thinking about shifting a Local oscillator signal, I'd
recommend a digital approach.

If you multiply the LO by 4, you can then divide by 4 to get perfect 90'
phase shift.



Jim