Q switch rf driver
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Q switch rf driver
The driver supplies an RF signal to an acousto-optic Q-Switch, typically in an Nd:YAG laser. Powered from 28VDC, the modulation inputs allow either full digital control or activation of an internal pulse generator. Links to postscript files of the board layout are below. Therefore the RF board SMT board was made using the bottom view mirrored file and the control and power supply boards through hole boards use the top view file. When the FPS or PPK control option is selected, the circuit is designed to eliminate the large light pulse that is output from the laser after a long period of inactivity. In addition, most of the RF parts have small inductors in series with the power supply to help filter out high frequencies. I was able to make a 5th order low-pass to q switch rf driver everything above 72Mhz. The output of the one-shot is used to trigger the MAX4258 multiplexer on the RF board and also drive a 74LS241 buffer to provide a TTL output for other equipment.
Ideally the RF board would be smaller with multiple layers including a ground plane but with careful layout, I was able to get by with a single sided PCB. Powered from 28VDC, the modulation inputs allow either full digital control or activation of an internal pulse generator. I used a trim pot to set a DC voltage, buffered it with an op-amp configured as a voltage q switch rf driver, and sent it to the gate pin on the amplifier to control the gain. The trim pot that controls the gain on the RF amp is low pass filtered at the trim pot and again at the gate pin to remove any noise. Note: When making the PCB you want the print side of the transparency to be against the PCB. This control is used to vary the output energy of the laser pulse.
Note: I need 20W 43dbm. The output of the one-shot is used to trigger the MAX4258 multiplexer on the RF board and also drive a 74LS241 buffer to provide a TTL output for other equipment. The rep rate had to be adjustable between 100Hz and 100KHz and have a TTL output to synchronize the output with other equipment. R390 Series RF Driver high power R 390xx-yyDMzzz -A 50W, 100W A compact high power RF driver module is available in output powers of 50 or 100W. I decided to keep it simple. This excess energy can cause unwanted damage to the target of the laser. First pulse suppression is implemented through either analogue modulation, RF off analogue control, triggered first pulse suppression, or triggered pre-pulse kill, as described in our. The RF Driver can produce up to 24 watts output into a 50 ohm load.
Q switch rf driver
This excess energy can cause unwanted damage to the target of the laser. The rep rate had to be adjustable between 100Hz and 100KHz and have a TTL output to synchronize the output with other equipment. Links to postscript files of the board layout are below. Pictures of the inside and a rear view of the box.
Powered from 220VAC or 110VAC, the modulation inputs allow either full digital control or activation of an internal pulse generator. Therefore the RF board SMT board was made using the bottom view mirrored file and the control and power supply boards through hole boards use the top view file. Ideally the RF board would be smaller with multiple layers including a ground plane but with careful layout, I was able to get by with a single sided PCB.