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Sun Jan 30 19:26:03 2011, Koji, Summary, Green Locking, Prototype freq divider  
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Wed Feb 2 03:27:20 2011, Koji, Summary, Green Locking, 85MHz Freq divider  
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Wed Feb 2 09:56:55 2011, Koji, Summary, Green Locking, Installed the freq divider and Rana's PFD 
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Wed Feb 2 10:44:26 2011, Koji, Summary, Green Locking, Freq fluctuation measured by the freq divider and Rana's analog PFD
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Wed Feb 2 12:55:34 2011, Koji, Summary, Green Locking, Freq fluctuation measured by the freq divider and Rana's analog PFD
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Sat Feb 5 23:03:04 2011, rana, koji, Summary, Electronics, Analog Frequency Discriminator: splitter + mixer + long cable  
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Sun Feb 6 02:29:28 2011, rana, Update, Electronics, Analog MFD: longer cable
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Message ID: 4237
Entry time: Wed Feb 2 03:27:20 2011
In reply to: 4228
Reply to this: 4238
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Author: |
Koji |
Type: |
Summary |
Category: |
Green Locking |
Subject: |
85MHz Freq divider |
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The freq divider was built and installed in the beat detection path.
Attachment 1: Circuit diagram
- Input stage: Wideband RF amp with DC block at the input and the output. The gain is 10dB typ.
- 2nd stage: Ultra fast comparator AD9696. Note: AD9696 is an obsolete IC and there are only a few extra at Wilson house.
The output is TTL/CMOS compatible.
- 3rd stage: 14bit binary ripple counter (fmax~100MHz.)
Note: I have added 7805/7905 regulators to the circuit as I could not find -5V supply on the 1X1/2 racks.
Attachment 2: Packaging
- The box is german made Eurocard size box from Techno-Isel Linear Motion http://www.techno-isel.com/lmc/Products/EnclosureProfiles11055.htm
The box is excellent but I didn't like the fixing bolts as they are self-tapping type. I tapped the thread and used #6-32 screws.
- The prototyping board is BPS's (BusBoard Prototype System http://www.busboard.us/) SP3UT. The card size is 160mm x 100mm.
The other side is a ground plane and the small holes on the board are through holes to the ground plane.
This particular card was not easy to use.
- The input is SMA. Unfortunately, it is not isolated. The output is an isolated BNC.
- The supply voltage of +/-15V is given by the 3pin D-connector. The supply voltages have been obtained from the cross connect of 1X1.
Attachment 3: Input specification
- The input frequency is 10MHz~85MHz. At lower frequency chattering of the comparator against the multiple zero crossing of the (relatively) slow sinusoidal waves.
- The input amplitude. There are no apparent degradation of the freq jitter when the input power was larger than -30dBm.
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