HSMP-3810 데이터 시트보기 (PDF) - Avago Technologies

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HSMP-3810

Surface Mount RF PIN Low Distortion Attenuator Diodes

Avago Technologies 

Typical Applications for HSMP-481x Low Inductance Series (continued)

Co-Planar Waveguide Shunt Connection for HSMP-481x

Series

Co-Planar waveguide, with ground on the top side of the

printed circuit board, is shown in Figure 10. Since it elimi-

nates the need for via holes to ground, it offers lower shunt

parasitic inductance and higher maximum attenuation

when compared to microstrip circuit.

Co-Planar Waveguide

Groundplane

Center Conductor

Groundplane

Equivalent Circuit Model

HSMP-381x Chip*

Rs

Rj

2.5 Ω

Cj

RT = 2.5 + Rj

CT = CP + Cj

Rj =

80

I0.9

Ω

0.18 pF*

* Measured at -20 V

I = Forward Bias Current in mA

*See AN1124 for package models.

Figure 10. Circuit Layout.

Rj

0.3 pF

0.75 nH

Figure 11. Equivalent Circuit.

5

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