Continue to Site

Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Register Log in

Can i do 2.5 to 5GHz frequency doubling using full-wave rectifier?

Status
Not open for further replies.
T

Terminator3

Advanced Member level 3
Joined
Feb 25, 2012
Messages
802
Helped
71
Reputation
142
Reaction score
63
Trophy points
1,308
Activity points
9,027
Is it good idea? What should i do else? Short-circuit stubs at f0 on output and 2f0 at input to filter out?

Thanks!
 

I think its perfectly possible theoretically
 

raiya_23 said:
I think its perfectly possible theoretically
Click to expand...

There are many commercial doublers using this principle. Check those by MiniCircuits. Such doublers need typically +17...+20 dBm to saturate the diode pair or quad, output power can be +4...+8 dBm over wider bnd.
 

a full wave rectifier will double the frequency. And if balanced, it will not leak out too much fundamental frequency (a good thing if you need a broad frequency range of coverage). But they are lossy...you should expect at least 8 dB of conversion loss.

You can get maybe 1 dB of conversion loss if you use a properly designed varactor X2. And active multiplier can have conversion gain, but watch what it does to the noise floor!
 
biff44 said:
a full wave rectifier will double the frequency. And if balanced, it will not leak out too much fundamental frequency (a good thing if you need a broad frequency range of coverage). But they are lossy...you should expect at least 8 dB of conversion loss.

You can get maybe 1 dB of conversion loss if you use a properly designed varactor X2. And active multiplier can have conversion gain, but watch what it does to the noise floor!
Click to expand...

I have designed varactor multipliers long ago. They usually work at one frequency only, with a limited bandwidth. They require a high driving input and are very sensitive to any mismatch. I would not recommend anyone to try designing a good wideband doubler with a varactor.

Passive diode doublers only require good input/output match and a good drive power. Then use a band-pass filter and amplifier to get enough output power.
 
Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top