A wide dynamic range square-law diode detector

Details A wide dynamic range square-law diode detector A wide dynamic range square-law diode detector

Sep 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988itim...37..429a&link_type=abstract

IEEE Transactions on Instrumentation and Measurement (ISSN 0018-9456), vol. 37, Sept. 1988, p. 429-433. Sponsorship: Fondo Nacio

Astronomy and Astrophysics

Astronomy

Diodes, Radio Astronomy, Radio Frequencies, Signal Detectors, Temperature Effects, Electrical Impedance, Rc Circuits

Scientific paper

Semiconductor square-law diode detectors are frequently used in radio astronomy to recover signals immersed in the system noise. Their use is commonly restricted to narrow dynamic ranges of very low signal levels where the square-law is valid. A circuit based on operational amplifiers is proposed that would minimize temperature-drift effects within a dynamic range greater than 30 dB, with an efficiency 600 times greater than the simple high-impedance unbiased detector. Using square-law detector theory, optimum performance is determined for a detector driving source impedance of about 14 percent of the dynamic resistance.

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