In many modern integrated receivers, particularly those in wireless devices such as cell phones and Wifi receivers, the intermediate frequency is digitized; sampled and converted to a binary digital form, and the rest of the processing - IF filtering and demodulation - is done by digital filters (digital signal processing, DSP), as these are smaller, use less power and can have more selectivity.[3] In this type of receiver the RF front end is defined as everything from the antenna to the analog to digital converter (ADC) which digitizes the signal.[3] The general trend is to do as much of the signal processing in digital form as possible, and some receivers digitize the RF signal directly, without down-conversion to an IF, so here the front end is merely an RF filter.