Re: Dual sine wave generator with variable frequency and 90 degree phase difference

On Sep 3, 11:42 pm, Steve <st...@xxxxxxxxxx> wrote:
I'm looking for a waveform generator that outputs two sine waves of
the same frequency with 90 degree phase difference (sine and cosine).
I need a variable frequency between 0.05 Hz and 10 Hz.  Is there an
analog design that uses a single potentiometer or perhaps is voltage
controlled ?  Low distortion is not a requirement.

The Analog Devices DDS chips include a couple that will generate
quadrature outputs - the AD9958 would do the job

http://www.analog.com/en/rfif-components/direct-digital-synthesis-dds/AD9958/products/product.html

though it is on the expensive side and much faster than you need.

Winfield Hill's web-site had a scheme for using two of their cheaper
DDs parts to generate sine waves in quadrature, but I've not seen it
recently, and Google can't seem to find it.

--
Bill Sloman, Nijmegen
.

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