Abstract: A multi-mode analog to, digital converter (ADC). The novel ADC includes an input terminal for receiving an analog input signal; a plurality of processing stages, each processing stage adapted to generate an output signal from an input to that processing stage; and a mechanism for determining a mode of operation and in accordance therewith connect the processing stages and the input terminal in a predetermined configuration. In an illustrative embodiment, the ADC can be configured as a subranging ADC, and the mechanism for determining, the mode of operation includes a signal processor for automatically selecting the mode of operation based on the frequency components of the input signal.

Abstract: A method and multicoupler for a receiver at a base station in a cellular/PCS radio communication system includes a cooled container that is mounted on an antenna tower at the base station. The container is mounted on the antenna tower adjacent an antenna and contains thereinside a preselector filter, a highly linear amplifier, and a directional coupler that are cooled to a temperature less than 175.degree. K. and greater than 100.degree. K. A power splitter is connected between the output from the container and the radio system receiver, and is located at a ground station near the base of the antenna tower. Cooling the components inside the container, particularly the amplifier, to a temperature of about 150.degree. K. reduces the noise from the multicoupler so that base station range is extended, building penetration is improved, and subscriber transmit power may be reduced.