RF Photodiode Impedance match?
时间：04-08
整理：3721RD
点击：
Hello,
I am trying to design a photodetector circuit for picking up a laser source being modulated at 1.6GHz.
My thoughts were to couple the photodiode to a cascaded pair of MMIC amplifiers.
Do I need to impedance match the output of the diode to the 50ohm impedance of the MMIC amplifier input (input vswr of?
The photodiode has a shunt resitance of 300Mohm, Series resistance of 10ohms junction capacitance of 0.4pF. I am not sure how to convert these numbers so that I can make an impedance matching network.
Anyone have any hints on where to start?
Cheers
I am trying to design a photodetector circuit for picking up a laser source being modulated at 1.6GHz.
My thoughts were to couple the photodiode to a cascaded pair of MMIC amplifiers.
Do I need to impedance match the output of the diode to the 50ohm impedance of the MMIC amplifier input (input vswr of?
The photodiode has a shunt resitance of 300Mohm, Series resistance of 10ohms junction capacitance of 0.4pF. I am not sure how to convert these numbers so that I can make an impedance matching network.
Anyone have any hints on where to start?
Cheers
Hello,
Get an equivalent value of impedance of the diode and develop a matching network using any Smith Chart tool (many free tools like Quick Smith are available). MAtching is necessary for coupling maximum power from the photodiode to the amplifier as per my understanding.
Hope it helps. Thanks.