Most Popular Articles
AES3 Passive Converters
AES3 digital signals are being used more and more everyday. There
are two versions of this standard. One is a balanced signal passed over
a twisted-pair wire with a characteristic impedance of 110 ohms. Its
complete name is AES3-1992. The other is an unbalanced signal passed
over coaxial cable with a characteristic impedance of 75 ohms. This is
called AES3-ID-1995. Both formats are commonly referenced without the
last four digits, which indicate the year the standard was
Apart from the voltage level and ground reference, the formats are identical. The passive circuit below can be used to convert signals from one format to the other. Both circuits account for the difference in impedance. The balanced-to-unbalanced converter also reduced the voltage level. Because these are passive circuits, the unbalanced-to-balanced converter cannot increase the voltage level. This circuit is better suited to applications where a long signal path is needed and an amplifier can be placed at the receiving end.
A balanced signal must not only be unbalanced, but also reduced in level by 14dB. The circuit below has a load impedance of 112 ohms, a source impedance of 72 ohms, a return loss of >25dB, and an atenuation of 1:5 (14dB).
Acceptable Use Policy blog comments powered by Disqus
[an error occurred while processing this directive]
Today in Radio History
The history of radio broadcasting extends beyond the work of a few famous inventors.
Read each issue online in our Digital Edition Format in your Web browser.
EAS Information More on EAS
The feed provides feeds for all US states and territories.
Need a calendar for your computer desktop? Use one of ours.
Information from manufacturers and associations about industry news, products, technology and business announcements.
Browse Back Issues[an error occurred while processing this directive]
Also in the March Issue
- The "And More" of Automation
- FCC Enforcement Items to Watch
- Testing AM Antennas
- New Products
- Field Report: Cloud Microphones Cloudlifter CL-1
- New Products at the 2014 NAB Show
- Side by Side: IP Codecs