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.
Proceedings Title: Proceedings of the 2012 IEEE International Frequency Control Symposium
Conference Dates: May 22-24, 2012
Conference Location: Baltimore, MD
Conference Title: 2012 IEEE International Frequency Control Symposium
Pub Type: Conferences
Decimation, digital measurement, DSP, FPGA, phase noise measurement