HSMP-3813 datasheet(10/12 Pages) HP

10 / 12 page

Microstrip Shunt

Connections for

HSMP-48XX Series

In the diagram above, the

center conductor of the

microstrip line is interrupted

and leads 1 and 2 of the

HSMP-38XX series diode are

placed across the resulting gap.

This forces the 0.5 nH lead

inductance of leads 1 and 2 to

appear as part of a low pass

filter, reducing the shunt

parasitic inductance and

increasing the maximum

available attenuation. The 0.3 nH

of shunt inductance external

to the diode is created by the via

holes, and is a good estimate for

0.032" thick material.

Co-Planar Waveguide

Shunt Connection for

HSMP-48XX Series

Co-Planar waveguide, with

ground on the top side of the

printed circuit board, is shown

in the diagram above. Since it

eliminates the need for via holes

to ground, it offers lower shunt

parasitic inductance and higher

maximum attenuation when

compared to a microstrip circuit.

50 OHM MICROSTRIP LINES

PAD CONNECTED TO

GROUND BY TWO

VIA HOLES

0.3 nH

0.3 pF*

1.5 nH

*0.8 pF TYPICAL FOR HSMP-4820

Figure 34. Equivalent Circuit.

Figure 33. Circuit Layout.

*0.8 pF TYPICAL FOR HSMP-4820

Figure 36. Equivalent Circuit.

Figure 35. Circuit Layout.

Co-Planar Waveguide

Groundplane

Center Conductor

Groundplane

0.3 pF*

0.75 nH

HSMP-3813 Datasheet(PDF) 10 Page - Agilent(Hewlett-Packard)

HSMP-3813 Datasheet(HTML) 10 Page - Agilent(Hewlett-Packard)

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