Manchester decoder technique and circuit

Manchester codes are popular protocols for data transmission over both wireless and wireline communication systems. The technique consists of a encoder and a decoder. Of the two, the decoder is more of a challenge. There are a number of ways of implementing a manchester decoder. We think the simplest way to do it is using a completely digital technique. This technique is described in a recent brief note from Signal Processing Group Inc. The paper can be found at http://www.signalpro.biz under the Engineering Pages menu item.

VSWR, its relationship to return loss

The voltage standing wave ratio and the return loss ( and its related quantity, the reflection coefficient)are all related to each other. Once any one of these can be calculated, measured or simulated the others can be derived. These quantities become specially important in the case of matching network design ( as in Rf Power amplifiers for example). A brief paper by the technical team at Signal Processing Group Inc., describes this. The paper may be found at http://www.signalpro.biz > Engineering pages by interested readers.

Classes of RF Power amplifiers and when to use them

RF power amplifiers come in multiple classes. A, B, C, D, E,F etc. Some of these are highly efficient but more non-linear. The Class A amplifier for example is very linear in operation but dissipates a lot of DC power. In order to understand the advantages and disadvantages of each, it is useful to study the characteristics of these types of amplifiers. An interesting paper was found in the literature which in our opinion is a good one for the student of RF amplifier classes. The reference is provided below for interested parties. " RF Power Amplifiers, Classes A through S -- how they operate, and when to use each". By, Sokal, N.O. Design Automation, Lexington, MA, USA. Published in the Electronics Industries Forum of New England, 1997, Professional Program Proceedings, Boston, MA. 6 -8 May, 997. pp 179-252.