Phase-shift errors of a balanced mixer with high level signal

The amplitude of photoelectric intensity current delivered by the photodiode of a laser rangefinder varies with a factor greater than 1000 versus distance and reflectance of the target. With high levels, amplitude distortion generates a phase-shift error in a double balanced mixer. The proposed mode...

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Main Authors: Perchet, G., Lescure, M.
Format: Conference Proceeding
Language:English
Subjects:
Circuits
Laser beams
Laser feedback
Laser noise
Local oscillators
Phase distortion
Photodiodes
Radio frequency
Signal resolution
Voltage
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Lescure, M.
description The amplitude of photoelectric intensity current delivered by the photodiode of a laser rangefinder varies with a factor greater than 1000 versus distance and reflectance of the target. With high levels, amplitude distortion generates a phase-shift error in a double balanced mixer. The proposed modelling explains this error. It can be suppressed with a clipper differential circuit and by generating harmonics on the local oscillator channel with a differentiated square wave. The error of the differential input circuit is proportional to the product of input signal amplitude and frequency; a macro-model is suggested, in which errors from nonlinear operation are distinguished from errors from low level photoelectric signal.
doi_str_mv 10.1109/ICECS.1996.582710
format conference_proceeding
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With high levels, amplitude distortion generates a phase-shift error in a double balanced mixer. The proposed modelling explains this error. It can be suppressed with a clipper differential circuit and by generating harmonics on the local oscillator channel with a differentiated square wave. The error of the differential input circuit is proportional to the product of input signal amplitude and frequency; a macro-model is suggested, in which errors from nonlinear operation are distinguished from errors from low level photoelectric signal.</abstract><pub>IEEE</pub><doi>10.1109/ICECS.1996.582710</doi></addata></record>
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source IEEE Electronic Library (IEL) Conference Proceedings
subjects Circuits
Laser beams
Laser feedback
Laser noise
Local oscillators
Phase distortion
Photodiodes
Radio frequency
Signal resolution
Voltage
title Phase-shift errors of a balanced mixer with high level signal
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