hi damian,first thank you for your reply,but i still feel confused about what you said:
1、I understand what’s your meaning in the front half part，however,the jitter value in my first slide should be 0.00294339(H RANGE) multiply 0.01us(because the bit rate is 100Mbps) and it equals ~30ps.you can check it!when i modified the bit rate the H RANGE and bit period should be different,so the jitter should be changed. In my opinion,the jitter is relative to the time length between the samples point.for example,if the bit rate is low like 1Mbps,if we set the samples per bit 32,then the time length should be ~30ns(1us/32) and the jitter should be the same level.if we increase the bit rate to 1Gbps, the time length should be ~30ps(1ns/32)then the jitter should be that level.as a conclusion,if we increase the bit rate and decrease the samples per bit to make the time length between the samples point the same level,the jitter should be also the same level.however,i found that is not true.
2、yes,i found that the jitter increase when the sample rate increase.so is it right that the jitter value getting from the high sample rate will be more accurate.
thank you for your reply twice!