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|Author(s):||Corey A. Barnes; Archita Hati; Craig W. Nelson; David A. Howe;|
|Title:||5 MHz Phase Detector With Low Residual Flicker|
|Published:||September 15, 2011|
|Abstract:||The measurement of close-to carrier phase modulation (PM) noise of state-of-the-art oscillators is always challenging. Quite often the residual noise of the phase detector used in these measurements is the source of difficulty. In particular at Fourier offset frequencies between 5 and 100 Hz, oscillator noise has a slope of f- -3 and may be lower than the mixer noise floor which follows a slope of f- -1. A conventional double balanced mixer (DBM) using 2N2222A transistors as the non-linear components of a diode ring is constructed for use as a phase detector. Residual single-sideband PM noise measurements at 5 MHz for this device have shown an extremely low flicker noise floor of L(10 Hz) = -165 dBc/Hz. The low noise floor of this mixer makes the device ideal for use as a detector for PM noise measurement systems. Implementing this mixer design in a dual-channel measurement system, a cross-correlated PM noise floor of better then L(10Hz) = -170 dBc/Hz is expected. These features set this DBM design apart from other mixers used for phase detection at 5 MHz.|
|Pages:||pp. 1 - 2|
|Keywords:||Flicker noise,mixers,phase detector,phase noise|
|PDF version:||Click here to retrieve PDF version of paper (173KB)|