On 10/31/13 4:02 AM, Bob Camp wrote:
Hi
The control voltage on the 12 V OCXO is likely 0-10V or 0-5V. The
tune on the 3.3V part isn’t going to be above 3.3V and it may be
0-2.5V. The 3.3V part is going to be at least 8X more sensitive to
grounding issues.
I've got a BUNCH of VCOs that are 3.3V or 5V, and have 15V tuning
ranges. It's a real pain when you're looking to swap VCOs in a PLL to
change the tuning range in a breadboard.
Minicircuits ROS-3710 is a fine example.. 5V operation, tuning range 0.5-13V
ROS-3388-219 is the same.
It's because the tune port goes right to the varactor, which is, not so
oddly, DC blocked from the amplifier circuit running on 5V
To put this in perspective, you can see a change on a normal 12V part
grounding it on the top side of a PC board vs grounding it on the
bottom side of the board. The 0.032” of solid ground lead has enough
drop to be noticeable.
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