8-05-09 Added information on experimental
4-5-15 Add Log Det Response Plot
5-18-15 Change filter capacitors, Change Parts
List to Rev A and move to this page.
Log Detector, size-A
Use your mouse's "right click" and "Save Link" to download
the current versions:
Schematic, in ExpressPCB software.
Base artwork for PWB, in ExpressPCB software.
Use this drawing to order the pwb from Express, or use as
Layout to locate
the parts on the Board.
c. PLSLIM-LD-8306 Rev A, Parts List, on
bottom of this page, only.
The SLIM-LD-8306 Log Detector has a dual
function. It is used as a detector to convert RF power to DC
voltage (RSSI). And, it is used as a high gain, RF limited
The module has an input impedance of 50 ohms (J1)
and a bandwidth
of 3 MHz to 160 MHz. The RSSI dynamic
range is -90 dBm to +10 dBm, with a DC output of +0.4 volts to +2.4
volts, on J2, "MAGVOLTS". The Limited I.F.
Output (J3) is a 50 ohm source with 50 mv peak to peak output.
The limiter input dynamic range is from -77 dBm to +10 dBm.
It should be noted that this module is
extremely sensitive to outside noise influence. It is important
that this module be totally shielded with a perimeter fence and a