CHV2240-99F-00 Ver la hoja de datos (PDF) - United Monolithic Semiconductors

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CHV2240-99F-00

Multifunction : K-band VCO and Q-band Multiplier GaAs Monolithic Microwave IC

United Monolithic Semiconductors 

K-band VCO / Q-band Multiplier

CHV2240

Proposed external high Q resonator

This chip has been especially designed to be coupled to a high Q

dielectric resonator. 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.

Alumina substrate : thickness=250µm

Dielectric

resonator

50 Ohm resistance

3xl

d

via hole 2xl

4 5 6 7 8 9 10 11 12 13 14

3

2

1

15

16

17

Additional information

n Resonator reference example = MURATA /DRD036EC016. As the

exact frequency is given by the resonator size but also by the

environment (cavity size, substrate characteristics, parasitic couplings

…), the final dimensions of the resonator have to be defined according

to the definitive module design. Other kind of resonators can be used

(from TEKELEC or TRANS-TECH). The temperature coefficient has to

be chosen according to the environment.

n Resonator coupling : d=0.2 to 0.3mm , l=1.5mm (quarter wave).

These values have been used in the test fixture, of course they can be

modified if the environment is different. The distance between the

resonator and the edge of the substrate (close to MMIC) is proposed

to be 3xl=4.5mm (3 quarter waves), theoretically only one is necessary

but in this case the distance between resonator and MMIC is too low

for automatic assembly.

n 50Ω line width on alumina (heigth=0.25mm) = 0.238mm

n 50Ω load on alumina : this load has to be as good as possible (low

parasitic inductance).

n Cavity size (mm) : 18 x 17 x 7

Ref. :DSCHV22400096 -05-Apr-00 dd-Mmm-yy

5/8

Specifications subject to change without notice

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