Abstract: A receiver for measuring the amplitude of input amplitude modulated signals over an 80 dBm range and producing a digital output. The amplifier comprises a power splitter to which an input signal is applied via a limiter. First and second video detectors are coupled to the power splitter. In the case of the second video detector, an R.F. linear amplifier is connected in the signal path to provide an overall 40 dB's of gain relative to the input of the first video detector. Each video detector comprises a detector stage whose output is connected to an amplifier chain, each amplifier in the chain having a gain of 10. The outputs of the detector stage and amplifiers are quantized and applied to a logarithmic analog-to-digital converter. The outputs of the respective analog-to-digital converters are applied to a combiner.