Frank's Random Wanderings

New Project Posted – RF Signal Generator

There’s a new project posted on the main website – a simple RF signal generator that (mostly) covers the range 640 MHz to 5.8 GHz.

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The project can be considered as being in two halves. First is the RF half. This is provided by a Linear Technology LTC6946 demo board. The 6946 is a PLL synthesizer. Put simply, you program its internal control registers with suitable PLL multiplication / divide factors, and it outputs the resulting frequency. The synthesizer is programmed via an SPI port.

The second half is a Texas Instruments Stellaris Cortex-M3 development board with a 3.5″ touch-screen color display. It’s programmed to be the user interface – you can enter your desired frequency on the touchscreen, it calculates the values for the various LTC6946 internal registers, then programs them via SPI. It provides a really nice user interface to what is otherwise a very simple project. Then everything is wrapped up in a simple metal box.

Full information on the build, including the source code for the software, is provided on the main site. Enjoy!

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