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"Old Macdonald" wrote in message ... I want to try to detect signal levels of 50mv to 200mv peak to peak. I need a passive circuit with no amplifiers, and I will be feeding a DVM with .01v resolution. The problem I am having is that a 1N34 will not conduct very well at these low levels. Is there a more suitable diode? Can you give me a part number, or a simple way to get just one or two of these diodes? What the diode is looking at is a 50 ohm port on a 30 to 60 mhz I.F. chassis. You can use "Zero-bias schotky diodes" for detecting small signals, but you can also pass a small bias current through an ordinary diode to overcome the forward conduction voltage. Zero Bias Shottky Detector Diodes (by Agilent) HSMS-2850 HSMS-2852 HSMS-2862 |
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