On 4/11/11 5:58 AM, paul swed wrote:
Wow thats a multiplier chain. The IF is reasonable and would easily be
accomplished in 1 to 2 chips today. Though 2 would be good so you can add
filtering and improve isolation.
That's not all that exotic. In some systems, you don't want PLLs
because they may not always lock (e.g. over wide temperature ranges, or
where a part is particularly sensitive to radiation: hyperabrupt
varactors, for instance). A multiplier almost always works. The trade
is often that the multiplier chain might consume more power than a
single PLL, although I've seen some remarkably low power multiplier
chains, and at higher frequencies, the dividers in the PLL start to
consume a lot of power.
Thanks
On Mon, Apr 11, 2011 at 3:47 AM, Paramithiotti, Luciano Paolo S<
[email protected]> wrote:
more info for you:
Input/output:
+15VDC
Diplexer for 10Mhz input for LO multiplier chain and 75.42 Mhz output to
receiver.
The LO, 1500Mhz, is obtained from 10 Mhz standard coming from GPS receiver
as follow:
X3=30Mhz x5=150Mhz x5=750Mhz x2=1500Mhz.
RF path 3 stage amplifier and filter for a total gain of 32dB (antenna is
passive right-hand circular polarization).
RF BW is 150Mhz
IF path 4 mmic stages and filter for a total gain of more/less 50dB.
IF BW is 20Mhz
This is a 1990 project.
Luciano P. S. Paramithiotti
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