Javert
Member level 2
I need to somehow measure the difference between the leading edges of two clock signals.
The first thing that came to my mind is the use of XOR GATE.
For the first experiments I used 74HC86 . For a large time difference between signals such as 100ns everything works great if the time difference is shortened still on the output I see that the difference between the signals is shortened up to about 20 ns. Between 20 ns and 15 ns, the change in input no longer affects the output and and below 15ns they no longer appear on the output are nothing the signals are like in phase.
I'm interested in differences from about 2ns
It occurred to me to try faster logic, but
1. Faster than HC is at + 3.3V LVC . Is there any even faster logic for + 3.3V?
2. I'm looking at the 74LVC86A datasheet, but nowhere do I see anything from which it is possible to find out what time differences between the input signals the gate can still project onto the output. I can't search or does anyone care about me except me?
3. Are there any faster xor gates for reasonable money, so I'm not interested in GHz XOR from Analog Devices for $ 160 a piece, but gates to say $ 3
The first thing that came to my mind is the use of XOR GATE.
For the first experiments I used 74HC86 . For a large time difference between signals such as 100ns everything works great if the time difference is shortened still on the output I see that the difference between the signals is shortened up to about 20 ns. Between 20 ns and 15 ns, the change in input no longer affects the output and and below 15ns they no longer appear on the output are nothing the signals are like in phase.
I'm interested in differences from about 2ns
It occurred to me to try faster logic, but
1. Faster than HC is at + 3.3V LVC . Is there any even faster logic for + 3.3V?
2. I'm looking at the 74LVC86A datasheet, but nowhere do I see anything from which it is possible to find out what time differences between the input signals the gate can still project onto the output. I can't search or does anyone care about me except me?
3. Are there any faster xor gates for reasonable money, so I'm not interested in GHz XOR from Analog Devices for $ 160 a piece, but gates to say $ 3