CHV2241
K-band Oscillator / Q-band Mixer
Proposed external high Q resonator
This chip has been especially designed to be coupled to a high Q dielectric
resonator (For example typical Q. @ 10 GHz=24000 for MURATA
/DRD036EC016). The resonance is given by a dielectric cylinder coupled to a
50Ω line. The size of the resonator gives the centre frequency and the space
between the resonator and the line gives the loaded quality factor. The following
drawing shows an example of external configuration. As it is the assembly of a
test fixture all the biases are used and the auxiliary LO output is connected.
However, for a fixed application the configuration given in the previous section
can by applied.
Alumina substrate : thickness=250µm
Dielectric
resonator
50 Ohm resistance
d
2l
3l
via hole
Additional information
n
Resonator reference
example = MURATA /DRD036EC016. Other
kind of resonators can be used (from TEKELEC or TRANS-TECH).
The temperature coefficient has to be chosen according to the
environment.
n
Temperature drift
: For example, in the –40 to +100°C temperature
range, the frequency drift @ 38GHz is 12 MHz with the MURATA /
DRD036EC016 resonator.
n
Resonator coupling
: d=0.3mm , l=1.5mm. These values have been
used in the test fixture, of course they can be modified if the
environment is different.
n
50Ω line width
on alumina (heigth=0.25mm) = 0.238mm
Ω
n
Cavity size
(mm) : 18 x 17 x 7
Ref. : DSCHV22411074 -15-Mar.-01
6/8
Specifications subject to change without notice
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