Help: Digital phase detector design, counter design

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Alles Gute

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We are analog designers but sometimes we also need to do some digital work.
My current project need a digital phase detector and a 5-bit counter. I've pretty few experience in digital. Advice needed!
 

you can use the conventional phase frequency detector consisting of 2 flipflops and an and gate. you can find the information on it in most of the books. when you design digital gates, let's say an inverter, make the pmos 3 almost 3 times larger than the nmos so that you'll have same delays for 0>1 and 1>0 transitions and a threshold voltage of VDD/2. consider charge sharing so size the transistors at a network (nmos or pmos network) accordingly. if you have dynamic nodes in your flipflop, consider regeneration structures which consist of a single transistor. you can use TSPC logic for flipflops if you need high speed phase detector. you can also use your flipflops for the counter
 

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