2 Miniature 2 GHz Video Transmitter

August 8, 2021 | Juan Rivera | PROJECTS
2ghz_tx_pcb-1

Fabricating this miniature transmitter was a huge leap into the unknown for me. I am not a circuit designer, at the time I had and had almost no experience designing printed circuit boards or working with surface-mounted devices. But this is the way I learn. I also milled the aluminum enclosure. The transmitter measured about two inches square, and one inch high.

Hazcam_TX_Diagram-1

This is a block diagram of the transmitter. It consisted of a crystal-controlled frequency synthesizer which steered a 2 GHz voltage controlled oscillator. A directional coupler fed a sample of the output signal back to the synthesizer where it was compared with the internal reference. It was the comparator that steered the VCO.

2GHz PLL-1

This is the schematic for the phase-locked loop which drove a voltage-controlled oscillator. Output power was 200 Milliwatts.

2GHz PS

This is my switching power supply schematic. The input was anything from 10.0 to 15.0 volts. It produced two outputs: +5.0 V at 50mA and +15.0 V at 300 mA. It took up less than one square inch on my circuit board.

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