Updated
5-14-08. Update for name changes. Updated
8-11-09. Update components without changing
other documents. Add revision history Updated
5-18-15. Update Parts List, Change PL to Rev
A, and move to this page.
SLIM-BSQ,
Buffer Squarer, size-A
Use your mouse's "right click" and "Save Link" to download:
a. SKSLIM-BSQ Rev 0,
Schematic, in
ExpressPCB software.
b. LAYSLIM-BSQ Rev 0,
Layout, in
ExpressPCB software.
Use this drawing to locate
parts on the Board
c. PLSLIM BSQ Rev A, Parts List, on bottom of
this page, only.
d. PWB-MOB Rev 0,
Base artwork for PWB, in ExpressPCB software.
Use this drawing to order the pwb from Express.
This SLIM is constructed on a common printed
wiring
board, the PWB-MOB. Click to go to the
page describing the Master Osc or Buffer.
Revision History Original Release: Released on
7-01-2007
The purpose of the SLIM-BSQ is to take an
iput
signal,
buffer it, square the waveform, and drive up to 3 separate
users. The input signal can be a sine or square wave with a level
from -10 dBm to +18 dBm. The input impedance is determined by the
value of R9.
The Buffer Squarer contains a center
biased buffer and 3 line drivers. Each
output is 5 volt CMOS that can drive a 50 ohm line that is
terminated
with either, a high impedance load, or 50 ohms. A 49.9
ohm
resistor is shown as a series element in each output. Updated
8-11-09. However, a 33 ohm resistor is
a much better matching resistor.
For a 50 ohm
line, with a high impedance load at the end of that line, the
mismatched load will create a reflection. The
reflected signal will be dissipated
in the series 49.9 (or 33) ohm resistor.
For a 50 ohm
line, with a 50 ohm load at the end of that line, the 50 ohm load will
receive a 2.5 volt peak to peak square wave. If this is not
sufficient, the 49.9 ohm series resistor can
be replaced with a low impedance coupling capacitor (.01 uf for 64
MHz).
SKSLIM-BSQ, Schematic of Buffer Squarer, SLIM-BSQ Updated
8-11-09. A
33 ohm resistor is a much better
matching resistor, used for R1, R2, and R3. Updated
8-11-09. The
ferrite bead, FB1 may be replaced
with a 10 ohm resistor to improve noise rejection on the input power
line.
