08-07-2020, 01:53 PM
No, the 1N5819 is only a power diode. I confused it with the specialist Schottky diodes. It's no use for RF.
PIN diodes are only for switches and attenuators, no use at all as detector. They are either off (reverse biased) or variably on depending on the DC current, They are very very slow. So a small DC voltage will hold off a larger RF voltage, so they do have a per model minimum frequency. Also only a small forward DC voltage holds it on, a larger RF signal won't rectify. The 1N4007 has such wide junction and slow speed that it can be used 50 kHz to 30 MHz as a sort of poor PIN diode. It also works as a varicap! So it's not much use as an attenuator or switch at higher HF frequencies or VHF as the capacitance is too high. It seems it must be differently made to the 1N4001 to 1N4006. It also has a higher forward voltage drop than a 1N4001.
PIN diodes are only for switches and attenuators, no use at all as detector. They are either off (reverse biased) or variably on depending on the DC current, They are very very slow. So a small DC voltage will hold off a larger RF voltage, so they do have a per model minimum frequency. Also only a small forward DC voltage holds it on, a larger RF signal won't rectify. The 1N4007 has such wide junction and slow speed that it can be used 50 kHz to 30 MHz as a sort of poor PIN diode. It also works as a varicap! So it's not much use as an attenuator or switch at higher HF frequencies or VHF as the capacitance is too high. It seems it must be differently made to the 1N4001 to 1N4006. It also has a higher forward voltage drop than a 1N4001.
