Rich-
You want a frequency doubler. No doubt there are others around (Minicircuits?),
but I know you can buy one from Agilent Technologies (model number = 11721A).
The 11721A uses a piece of small diameter coax threaded through some ferrite
beads to make a balun, and then runs the output into a schottky diode bridge
(IIRC). The output of the diodes has a DC return to ground via a choke and a
resistor that would be 50 ohms if the diodes had no forward drop, but is
somewhat less that 50 ohms due to forward drop (adjust resistor for max RF
output). There is then a DC blocking capacitor from the diode output to the
output connector.
The conversion loss is rather high, 12 to 15 dB. A lot of RF drive is needed,
like +10 dBm or more. Don't expect to preserve linear AM through a doubler.
There are also more complex ways of making doublers with active devices which
actually have gain, but that is another longer story.
Don Borowski
(ex-Agilent Technologies)
Schweitzer Engineering Labs
[email protected] on 09/10/2002 11:40:16 AM
Please respond to [email protected]
To: [email protected]
cc: (bcc: Don Borowski/SEL)
Subject: Signal Generation
Certainly someone out there has devised a simple, lost cost method of
extending the operating frequency of their signal generator by using some
type of harmonic generating device such as a mixer or step recovery diode
and filters. In one application, I need to extend a 1 GHz generator to 2 GHz
and in another to 25 GHz (fat chance?). Any suggestions (other than buying
new generators)?
Richard Woods
Sensormatic Electronics
Tyco International
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