uhf tx layout - Electronic Circuits Projects Diagrams Free

bond000 · 9th June 2009, 10:06 PM

could some suggest some tips for designing layout for this circuit?like track width,type of pcb,track length,placement of components.

MikeMl · 9th June 2009, 10:30 PM

Go get an ARRL Radio Amateur's Handbook (any year) and read the VHF chapters. You might be able to borrow one from a local ham or the library.

crutschow · 9th June 2009, 10:31 PM

The thumbnail gives a pretty good basic layout for the parts and trace routing.
Make trace widths minimum to minimize capacitance (except for the connection from the output transistor to antenna as shown).
Lay out to minimize trace lengths.
Make sure to add the vertical grounded copper screen (shield) shown between stages to minimize the chances of oscillation.
Use a ground plane on the component side of the board as shown.
Connect all decoupling capacitors directly to the ground plane (surface mount caps are best)
And, as with all HF circuit design, good luck.

ccurtis · 10th June 2009, 02:11 AM

I would stress that you should follow the layout and components given by the inventor/author. The components are likely tweaked for the circuit to operate best based on that layout.

Mikebits · 10th June 2009, 07:28 AM

Your board would best work using a microstrip layout. Trace width should be chosen based on impedance. In your case I think 75 ohm. Read up on microstrip, and you can also get some info here.

Microstrip Transmission Line Characteristic Impedance Calculator Using a Formula by Brian C Wadell

And more theory here.

http://www.ansys.com/industries/mems..._micostrip.pdf

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9th June 2009, 10:06 PM	#1
bond000	uhf tx layout could some suggest some tips for designing layout for this circuit?like track width,type of pcb,track length,placement of components. Attached Thumbnails

9th June 2009, 10:30 PM	#2
MikeMl	Go get an ARRL Radio Amateur's Handbook (any year) and read the VHF chapters. You might be able to borrow one from a local ham or the library. Last edited by MikeMl; 9th June 2009 at 10:31 PM.

9th June 2009, 10:31 PM	#3
crutschow	The thumbnail gives a pretty good basic layout for the parts and trace routing. Make trace widths minimum to minimize capacitance (except for the connection from the output transistor to antenna as shown). Lay out to minimize trace lengths. Make sure to add the vertical grounded copper screen (shield) shown between stages to minimize the chances of oscillation. Use a ground plane on the component side of the board as shown. Connect all decoupling capacitors directly to the ground plane (surface mount caps are best) And, as with all HF circuit design, good luck. __________________ Carl Curmudgeon Elektroniker

10th June 2009, 02:11 AM	#4
ccurtis	I would stress that you should follow the layout and components given by the inventor/author. The components are likely tweaked for the circuit to operate best based on that layout.

10th June 2009, 07:28 AM	#5
Mikebits	Your board would best work using a microstrip layout. Trace width should be chosen based on impedance. In your case I think 75 ohm. Read up on microstrip, and you can also get some info here. Microstrip Transmission Line Characteristic Impedance Calculator Using a Formula by Brian C Wadell And more theory here. http://www.ansys.com/industries/mems..._micostrip.pdf __________________ Pay it forward.