SPEKTRALANALYSATOR

摘要

A spectrum analyzer, e.g., for telecommunication application, includes an input A to D converter (AD) for converting an input analog signal to corresponding binary words, these words then being fed via a buffer (PS) and a multiplexer (MX) to a digital filter (DF). Under the action of a control circuit (CS) the filter (DF) is fed with a series of different submultiples of a clock signal. For each submultiples the filter (DF) is also fed into a corresponding set of filter constants from a memory (PF). Spectrum analysis is made by changing the frequency of the clock submultiple signal to the filter and simultaneously supplying the corresponding filter constants from the memory while ensuring that the centre frequency of the filter passband remains constant.