Analog multirate signal processing

Multirate digital signal processing techniques were introduced in the 70's to appropriately accommodate different signal sampling rates to bandwidth variations along the signal path. The basic technique has also been applied to other signal processing technologies, such as charge-coupled devices, switched-currents and switched-capacitors, which are also discrete in time, but the signal amplitudes are represented in analog form, teading to the development of analog multirate signal processing techniques. More recently, fueled in part by the advances in integrated circuit fabrication processes, allowing mixed analog-digital systems to co-exist in monolithic realizations, and in part by the development of modern telecommunication systems, newly developed schemes have been proposed to combine the benefits of both digital and analog multirate signal processing, to achieve high efficiency in silicon and power cmsumption by reducing spread in device dimensions and relaxing amplifier settling time. 0