Interferometric Residual Phase Noise Measurement System Pakpoom Buabthong Lee Teng Internship Program Advanced Photon Source Accelerator System Division,

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Presentation transcript:

Interferometric Residual Phase Noise Measurement System Pakpoom Buabthong Lee Teng Internship Program Advanced Photon Source Accelerator System Division, RF Group Tim Berenc Argonne National Laboratory

Noise Characterization of Radio Frequency (RF) Devices Phase & Amplitude noise of a RF Carrier Lee Teng Internship 2013, Research Topic Presentation 2 Signal Level Frequency Carrier Residual or noise added to carrier by a device - Useful for characterizing noise added by a device or differential noise between devices (i.e. Short Pulse X-ray RF Cavities) Device Under Test ϕ Frequency Spectrum Polar Cartesian

Noise Measurement Using Saturated Mixer Lee Teng Internship 2013, Research Topic Presentation 3 90⁰ Phase Shift -Source phase noise ideally cancels -Usually limited by LNA-mixer noise floor and cable vibration Source V1V1 V2V2 Low Noise Amplifier (LNA) Low Pass Filter (LPF) Fast Fourier Transform R(t) femto-sec rms Frequency (Hz) dBrad 2 /Hz Frequency (Hz) Cumulative IntegralPhase Noise Power Spectral Density

Lee Teng Internship 2013, Research Topic Presentation Interferometric Noise Measurement 4 Signal Level Frequency Carrier DUT Noise 90⁰ Phase Shift 180⁰ Combiner RF Amp Suppress Carrier and Amplify Residual Noise Signal Level Frequency Source LO femto-sec rms Frequency (Hz) dBrad 2 /Hz Frequency (Hz) Cumulative IntegralPhase Noise Power Spectral Density