LVDS Logic in Switch Panel Circuit Board Reverse Engineering Recently, LVDS logic in Switch panel circuit board reverse engineering (low-voltage-differential-signaling) has attained widespread popularity because of similar characteristics, but with lower amplitudes and lower power dissipation than ECL. The defining LVDS specification can be found in the References. The LVDS logic swing is typically 350…
Source Termination in Trim Module PCB Card Cloning How Source Terminations in Trim Module PCB Card Cloning can be used in bidirectional link port transmissions between SHARC DSPs. The output impedance of the SHARC driver is approximately 17, and therefore a 33 series resistor is required on each end of the transmission line for proper…
Source Termination Method on Infometer Touch PCB Reverse Engineering The source termination method on Infometer Touch PCB Reverse Engineering, absorbs the reflected waveform with an impedance equal to that of the transmission line. This requires about 39 Ù in series with the internal output impedance of the driver, which is generally about 10 Ù. This…
High Speed DSP Interconnection on PCB Copy Below Figure shows a situation where several high speed DSPs must connect to a single point on PCB Copy, as would be the case when using read or write strobes bidirectionally connected from several DSPs. Small damping resistors shown in Figure A can minimize ringing provided the length…
Protect Analog Circuit in Data Logger Module PCB Reverse Engineering The best ways to protect sensitive analog circuits from being affected by fast logic are to physically separate the two by the Data Logger Module PCB Reverse Engineering, and to use no faster logic family than is dictated by system requirements. In some cases, this…
Trace Termination on DIN3 Meter Circuit Board Copying Much has been written about Trace Termination on DIN3 Meter Circuit Board Copying in their characteristic impedance, to avoid signal reflections. A good guideline to determine when this is necessary is as follows: Terminate the transmission line in its characteristic impedance when the one-way propagation delay of…
Reverse Engineering Accel Controller PCB Card Reverse Engineering Accel Controller PCB Card traces of defined impedance, either on a surface layer or embedded between layers. There of course are many other considerations beyond these impedance issues. Embedded signals do have one major and obvious disadvantage—the debugging of the hidden circuit traces is difficult to impossible.…
Symmetric Stripline Transmission Lines on Sprint Boost PCB Board Cloning A method of Sprint Boost PCB Board Cloning preferred from many viewpoints is a multilayer PCB. This arrangement embeds the signal trace between a power and a ground plane, as shown in the cross-sectional view of below Figure. The low impedance ac-ground planes and the…
Microstrip Guideline by Vehicle Dynamic Module PCB Copying This example touches an interesting and quite handy point. Reference 17 discusses a useful guideline pertaining to microstrip impedance on Vehicle Dynamic Module PCB Copying. For a case of dielectric constant of 4.0 (FR-4), it turns out that when W/H is 2/1, the resulting impedance will be…
Microstrip Transmission Lines on Digital Racing Dash Display PCB Cloning For a simple two-sided Digital Racing Dash Display PCB Cloning where one side is a ground plane, a signal trace on the other side can be designed for controlled impedance. This geometry is known as a surface microstrip, or more simply, microstrip. A cross-sectional view…