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|Author(s):||Craig W. Nelson; David A. Howe;|
|Title:||A Sub-Sampling Digital PM/AM Noise Measurement System|
|Published:||May 24, 2012|
|Abstract:||A digital phase/amplitude modulation (PM/AM) noise measurement system (DNMS) implementing field programmable gate array (FPGA) based digital down converters (DDCs), and 250 MHz analog to digital converters (ADCs) is reported. Performance in the first, baseband Nyquist region shows white phase noise floors of less than -180 dBc/Hz. With proper pre-filtering of the input signals to prevent undesired aliasing, high bandwidth track-and-hold amplifiers(THA) extend the operating range of the DNMS to microwave frequencies. Preliminary testing with an 18 GHz THA shows residual white phase noise floors at 10 GHz of less than -160 dBc/Hz.|
|Conference:||2012 IEEE International Frequency Control Symposium|
|Proceedings:||Proceedings of the 2012 IEEE International Frequency Control Symposium|
|Pages:||pp. 1 - 4|
|Dates:||May 22-24, 2012|
|Keywords:||Decimation,digital measurement,DSP,FPGA,phase noise measurement|