4

Typical Applications for HSMP-481x Low Inductance Series

Microstrip Series

Connection for

HSMP-481x Series

In order to take full advantage of

the low inductance of the

HSMP-481x series when using

them in series applications,

both lead 1 and lead 2 should be

connected together, as shown in

Figure 7.

Figure 7. Circuit Layout.

0.3 nH

0.3 nH

0.3 pF

1.5 nH

1.5 nH

Figure 9. Equivalent Circuit.

R

0.08

+ 2.5

I

b

0.9

12

3

Figure 6. Internal Connections.

HSMP-481x

Microstrip Shunt

Connections for

HSMP-481x Series

In Figure 8, the center

conductor of the microstrip

line is interrupted and

leads 1 and 2 of the

HSMP-481x series diode are

placed across the resulting gap.

This forces the 1.5 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 nHof shunt inductance

external to the diode is created

by the via holes, and is a good

estimate for 0.032" thick material.

50 OHM MICROSTRIP LINES

PAD CONNECTED TO

GROUND BY TWO

VIA HOLES

Figure 8. Circuit Layout.