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What's the simplest phase difference detector I can build

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sys_eng

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I like use the simplest off the shelf components to build phase difference detector. I do not want to use specialized ICs, the most common IC if possible.
What circuit would you recommend?
 

The simplest phase detector is an XOR gate. But
it may or may not give you the outcome you need
when you look at the larger loop.

A mixer IC can also be a phase detector if the two
signals are same frequency, different phase. Some
mixers are just 4 FETs, that's pretty simple.

There is a difference between phase detector and
phase-frequency detector, which may matter to you
(or your circuit's functioning). You need to decide
which style you require.

There are some old timey phase detector chips that
may still be available. May or may not suit the
frequency range. Like the MC4044, good up to a
sweet 8MHz but a classic. Motorola (ON Semi) has
numerous options, I'm sure there are many others.
 

You can use a simple double balanced mixer (from Mini-Circuits) or a single XOR gate - but dedicated ICs are quite nice - like AD9901. Exact circuit depends on application.
 

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