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CHV2240 Datasheet(PDF) 5 Page - United Monolithic Semiconductors |
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CHV2240 Datasheet(HTML) 5 Page - United Monolithic Semiconductors |
5 / 8 page K-band VCO / Q-band Multiplier CHV2240 Ref. :DSCHV22409336 - 02 Dec 09 5/8 Specifications subject to change without notice Route Départementale 128 , B.P.46 - 91401 ORSAY Cedex - FRANCE Tel.: +33 (0)1 69 33 03 08 - Fax : +33 (0)1 69 33 03 09 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 50 Ω 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. Dielectric resonator Alumina substrate : thickness=250µm 50 Ohm resistance via hole 3xl 2xl d 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 Additional information 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. 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. 50 Ω Ω Ω Ω line width on alumina (heigth=0.25mm) = 0.238mm 50 Ω Ω Ω Ω load on alumina: this load has to be as good as possible (low parasitic inductance). Cavity size (mm) : 18 x 17 x 7 Recommendation for Frequency stability In order to ensure a good frequency stability (versus temperature, external resonator aging,…), it is recommended to use an external frequency locked loop with a low frequency loop filter (below modulation frequency), or a PLL for both frequency modulation and stability. |
Similar Part No. - CHV2240_15 |
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Similar Description - CHV2240_15 |
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