微波EDA网,见证研发工程师的成长!
首页 > 研发问答 > 微波和射频技术 > 天线设计和射频技术 > Dynamic range of single detector diode?

Dynamic range of single detector diode?

时间:04-04 整理:3721RD 点击:
The dynamic range of a receiver, is practically it's ability to distinguish low-level signals among high-level signals.
I wonder, what is a typical dynamic range of a single diode (germanium, silicone, schottky) when connected as an envelope detector?

Considering detector square law, it's the amplifier dynamic range you need to ask for.

I assume no amplifier, I just need to know if the single diode will have a high dynamic range alone, higher than a good IP3 amplifier.

The dynamic range of a single Schottky diode detector is about 20dB. Can get few dB's higher if the diode is DC biased.
Silicon diodes (due to higher threshold voltage) have a bit less dynamic range.

That was helpful!
Have you got any guess about germanium diodes?

Germanium diodes, even they have lower threshold voltage than silicon, their dynamic range is the lowest, due to poor handling of high level signals.

Reviewing the thread, I see that "dynamic range" needs additional specification. We can either relate it to minimal detectable level or minimal input of an AM demodulator with a certain distortion.

I agree, I have no other specs. I was thinking if it is better (in terms of dynamic range only, not signal sensitivity) to have a preamplifier prior to a detector diode or better leave the diode alone.

Copyright © 2017-2020 微波EDA网 版权所有

网站地图

Top