2/4 quadrant multiplier theory

[sasami]

A 4 quadrant multiplier is a ring modulator.

David MOYLAN wrote:
> 
> Okay, just sitting here thinking about something.
> A 2 quadrant multiplier is essentially a VCA right?
> And a 4 quadrant works similarly except that if the
> control signal goes negative the polarity of the
> signal is reversed (with respect to + control signals).
> Would it be possible to get similar results by using
> a Voltage Controlled Mixer mixing 2 signals 180 degrees
> out of phase.  Assuming a certain bias added to the
> "control" signal, at 0 input we'd have 0 output (equal
> mix of signal and inverted signal), if the control
> swings positive, we get more straight signal, if it
> swings negative, we get more inverted signal.  Am I
> missing anything?  Thanks.  dave moylan

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                Ken Stone  sasami at blaze.net.au
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