# Phase-shifter 90 degree

#### MacBam

##### Newbie level 6
[/QUOTE]
differential phase ripple ?
High rather than low slew rate, according to the maximum signal voltage. I think many of recent CMOS general purpose OP can do. Don't know if the dynamic range requirements are particularly high? What's the acceptable differential phase ripple?

Differential Phase ripple? I am designing my filters with 2-5% resolution. Also, I am looking for a chip that contains many op-amps, since I am using stages.

One approach to this, with clock accuracies, is to use DDS, there are dual
channels that can gen the quadrature in one package. These are a bit
expensive., or use two of the cheap ones, $2 -$ 5 kinds of parts, and synch
them.

synching el cheapo ap note

You get very accurate freq and phase, no component tolerance issues
or drift (other than main clock, nominally xtal based), and very wide
sweep ranges from sub Hz into 100's of Mhz.

Regards, Dana.

Last edited:

#### FvM

##### Super Moderator
Staff member
I'm asking about the maximal deviation from 90 degree phase shift in the frequency band of interest. The approximation will usually designed with equiripple characteristic.

Quad OP would be my first choice.

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