| 摘要 |
The present invention relates to a system which uses information in a certain band of frequencies, fb. The information of interest is contained in an analog signal that has noise at higher frequencies. The analog signal is sampled using an integrate and hold amplifier, hence, noise from higher frequencies is aliased into the region of interest fb. In accordance with the present invention, the integrated and hold amplifier has a frequency response which has a zero at a frequency, fn, which is one of the frequencies aliased into the band of frequencies fb. Thus, the effect of the noise that appears near the frequency fn has much less effect on the signal when it is aliased into the frequency band of interest, fb. The performance of the system is thereby improved. |
