CESAR 1312 (E)
Installation, Setup, and Operation
5-7
CESAR™ 1312 Generator
Connecting Common Exciter (CEX) Circuitry (Optional)
If you want to connect common exciter (CEX) circuitry, each CESAR
generator provides two type BNC, female CEX connectors:
CEX In
and
CEX
Out
.
illustrates the CEX connector.
Figure 5-2. CEX/Interconnect
The common exciter routes the RF clock signals among the various parts of
the RF module, allowing you to phase-lock the outputs of two or more CESAR
generators. Phase-locking the generators together causes the generators to
run at the same frequency and with a fixed phase relationship between their
outputs.Therefore, multiple CESAR generators can be coupled into the same
plasma.
Note:
In this type of operation, slight differences in output frequency or in the
phase of the RF energy can create variations in frequency that may
have adverse affects.
To Make the CEX Connections:
Connect the CEX output of the master generator to the CEX input of up to
three slave units by using T-connectors for more than one slave.
Note:
The phase relationship between the RF power is affected by the
length of the cable used to connect the units. The use of a defined
CEX interconnect cable results in minimal phase shift. You can also
use commercially available phase shifters in the interconnect path
to provide additional control of phase shift.
When a generator receives CEX input within the following specifications, it
automatically frequency-locks to that signal:
•
Required input signal amplitude: TTL
•
Input and output frequency: 13.56 MHz ±0.005%
•
Input impedance: 50
Ω
•
Output signal amplitude: TTL
Содержание CESAR 1312
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