Richard, note that the Mini-circuits frequency doublers also have a fair amount of 3rd and 4th harmonic output. These harmonics can be increased by over-driving the doubler. Since you are only characterizing a filter, the multitude of harmonics shouldn't hurt. I would try the KBA-40 doubler driven at over 16 dBm. Sweeping the input from 2-3.33 GHz should provide harmonics from 4-10 GHz to chose from. I would go from the KBA-40 directly to an SMA and then through an 18 GHz coaxial attenuator such as the Mini-circuits BW-S10W2 (10 dB and only $30). This will give you 2nd harmonics at -10 dBm and 3rd harmonics at -30 dBm with a source return loss of around 20 dB.
Dave Cuthbert Micron Technology From: drcuthbert Sent: Friday, August 29, 2003 2:11 PM To: [email protected]; [email protected] Subject: RE: Extending Freq Range of Sig Gen 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 This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: [email protected] Dave Heald: [email protected] For policy questions, send mail to: Richard Nute: [email protected] Jim Bacher: [email protected] Archive is being moved, we will announce when it is back on-line. All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: [email protected] Dave Heald: [email protected] For policy questions, send mail to: Richard Nute: [email protected] Jim Bacher: [email protected] Archive is being moved, we will announce when it is back on-line. All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: [email protected] Dave Heald: [email protected] For policy questions, send mail to: Richard Nute: [email protected] Jim Bacher: [email protected] Archive is being moved, we will announce when it is back on-line. All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
