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...

Full description

Saved in:
Bibliographic Details
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
Online Access:Request full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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:10.1109/ICECS.1996.582710