Aperture jitter heavily affects the performance of an intermediate frequency or radio frequency bandpass sampling system.In theory

although the IF signal and baseband signal with the same bandwidth can be sampled using the same frequency

sampling an IF signal is effected by jitter more badly

and its sampling techniques are more difficult.If the aperture jitter issues of IF sampling system can not be well solved

it will be very possible to miss the right digital signal.The paper analyzes the causation of inducing aperture jitter

and the relationships between aperture jitter

SNR of ADC and the highest frequency of sampled signal.It presents the reasons of introducing the error between the highest frequency of sampled signal and analog bandwidth of ADC

and finds out the relationship of over-sampling ratio and gain processing and aperture jitter among IF sampling system.At last

it introduces several actual methods to reduce the aperture jitter.