Richard,
that is a good way to do it. A single-diode clamp will result in even
harmonics- a doubler. Using two diodes back-to-back will give odd harmonics- a
tripler. Schottky diodes might be nice.
Another route is to use an off-the-shelf doubler. The Mini-circuits KBA-20
doubler has an output range of 3.2-4.4 GHz and the KBA-40 has an out range of
5.4-9.6 GHz. This leaves 4.4-5.4 GHz and 9.6 to 10 GHz open but I suspect each
doubler will go beyond the specified range and cover this. The conversion loss
is specified as 12-18 dB and these cost $10 and $15 each. The 6 dB attenuator
will provide a good output match.
Another way to go is to use an 8 GHz MMIC amplifier and drive it into
clipping. An example would be a Mini-circuits ERA-21SM. These run $1.60. An
output attenuator would be good here too.
And mixers can be used too. Two mixers can be used. Looks like two different
Mini-circuits mixers are needed. You might need some 90 degree phase shifting
to mix the fundamental against itself- not sure about this. Then amplify if
needed and run thru an attenuator to get a 50 ohm output impedance.
Dave Cuthbert
Micron Technology
From: [email protected] [mailto:[email protected]]
Sent: Friday, August 29, 2003 12:41 PM
To: [email protected]
Subject: Extending Freq Range of Sig Gen
I need to characterize a filter up to 10 GHz, but my signal generator has a
top end of 4 GHz. Is there a simple means of generating a third harmonic
>from a signal generator while maintaining a 50 ohm source impedance? My
thinking is that a diode circuit should be able to create the harmonics and
then follow that circuit up with a 3-6 dB pad to maintain the source
impedance. Am I on the right track? Any circuit and component suggestions
would be appreciated.
Richard Woods
Sensormatic Electronics
Tyco International
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