Saw Frequency doubler and Phase Shifter

[Magnus Danielson]

From: "Bjorn Julin" <bnillson at hotmail.com>
Subject: Re: Saw Frequency doubler and Phase Shifter
Date: Wed, 20 Sep 2000 01:22:33 GMT

> Hi.

Hi there Björn and everybody...

> > > It will do all the way down to + - 5 volt if cmos op amps
> > > are used. It worked nice on my bread board at - +12 volt.
> >
> >Ah, but I refered to that the fact that for a "perfect mix" the comparators 
> > >swing should be mixed so that it has the same amplitude jump as the 
> >original >sawtooth as they come out of the output mix. The mixing I set up 
> >was based on >the +/- 15V op-amp swing and +/- 5V sawtooth swing 
> >assumptions. The ratio 3:1 >should be kept for the intended operation, 
> >rescaling would be necessary >otherwise.
> 
> Yes i know, all i was saying was that it works nice
> all the way down to +-5 volt "including" rescaling
> of the resistors.The message was that a Cmos often swings
> wey close to the rails so for 0 to+5 volt or +-5 volt designs
> bipolar has its limits if one want perfect +-5 volt wave shapes.

Ah, OK. I see.

Cheers,
Magnus