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Thanks, bowb2k.

I have already seen ANALOG DEVICES's application notes and the differential inputs vco buffers produced works below 500Mhz. I need one above 1Ghz.

With "Due the impossibility to realize an integrated one" I means that I don't have enough time to wait the end of a foundry process for device testing.

With "Due the impossibility to realize an integrated one" I means that I don't have enough time to wait the end of a foundry process for device testing.

Thanks a lot! Bye

Due the impossibility to realize an integrated one, I have abbandoned the idea. I will design a Colpitts VCO using discrete components(JFET or BJT), where can I find a good design guide? Bye

Where can I find a good tutorial or application note on RF differential inputs vco buffer design? Thanks.

Sure, I think that 100uSec are sufficents but the measuring system will be genaral purpose and it will can be able to measures moisture in small areas of anisotropic materials. Unfortunately the customer doesn't have a clear idea on what he wants. To avoid high frequency oscillators I will use...

The customer wish a low cost system using devices already available in warehouse and the fast switching speed is needed to do realtime measures. Sure, I will evaluate others solutions included the yours. Bye

Because I need a wideband(200MHz) at high frequency(1100GHz) and fine channel spacing with fast switching (~10usec) for a real-time moisture measuring system. However this is only an idea because the measuring system is under development and the design specifications aren't well known. Bye

The DDS over 1GHz have a high DC consumption(~500mA) so in a offset reference PLL I can use a DDS like offset reference at lower frequency (lower consumption) and PLL to work at higher frequencies having so low DC consumption. BYE

With "hybrid" I means using a mix of PLL and DDS. Do you know something about the one by CRAWFORD? Many thanks for the help, probably I will buy the MANASSEWITSCH. Bye.

Hi! I want to know if MANASSEWITSCH writes about Hybrid Frequency Synthesizers using offset refernce PLL and multiple loop PLL and how to design them (system and his blocks). Many thanks to you. Bye

I'm searching for these books: - FREQUENCY SYNTHESIZER DESIGN HANDBOOK by James A. CRAWFORD edited by Artech House - FREQUENCY SYNTHESIZERS: THEORY AND DESIGN by Vadin MANASSEWITSCH edited by Wiley or ebooks and files on: Hybrid Frequency Synthesis using Phase Locked Loops (PLL) Has someone...