A novel A/D converter utilizing phase modulation
1995
This paper describes a novel A/D conversion architecture suitable
for high-speed operation. The basic idea is to convert the amplitude of
an analog input into the phase rotation of a carrier signal, comparing
the rotation angle to that of the carrier. At that point, by weighing
the phase conversion range in a binary manner, the digital code
corresponding to the analog input can be obtained. An A/D converter
utilizing the concept above has been built out of components on the
market. Its resolution is four bits and the carrier frequency is 870
MHz. It successfully converts an input signal into 14 steps of digital
code. Also the converter operates up to 80 MHz, which is close to the
theoretical limit of 108 MHz
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