[hpsdr] FETs in mixers

[Kjell Karlsen]

Ahti (and all on the list):

Have you or anyone tested the SD8901 from Calogic? It seems to be a SMD  
version of the SD5000 but connected as a Wideband Ring Demodulator/ Mixer.  
There is a schematic showing it used with Minicircuits transformers. With  
20 dBm LO drive, the Input IP3 is 40 dBm! No need for drive via 74AC74. 2  
of them could probably be used as I/Q modulators/demodulators?

URL: http://www.calogic.net/pdf/SD8901.PDF

73, Kjell LA2NI



On Thu, 18 Jan 2007 07:53:10 +0100, Ahti Aintila <oh2rz.sdr at gmail.com>  
wrote:

> ***** High Performance Software Defined Radio Discussion List *****
>
> Sorry that I forgot the ARRL Handbook. In the 2005 edition, page
> 11.27, Fig.40 gives the answer how to drive the H-mode mixers.
>
> 73, Ahti OH2RZ
>
> On 18/01/07, Ahti Aintila <oh2rz.sdr at gmail.com> wrote:
>> For FET/MOSFET mixers see the article of Ed Oxner, Ham Radio Magazine,
>> March 1988, pp.10-14, "High Dynamic Range Mixing with the Si8901, and
>> the patent publication, US Patent 5,027,163:
>> <http://www.freepatentsonline.com/5027163.pdf?s_id=fec3770b2482bbfd0fd569eb189cfbf9>.
>>
>> On 18/01/07, Jerry <no2t at arrl.net> wrote:
>> > ***** High Performance Software Defined Radio Discussion List *****
>> >
>> > Hi
>> >        How do they drive the gates? Push-Pull?
>> >
>> >                de Jerry NO2T
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