APN1001 查看數據表（PDF） - Skyworks Solutions

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APN1001

Circuit Models for Plastic Packaged Microwave Diodes

Skyworks Solutions 

APPLICATION NOTE • APN1001: CIRCUIT MODELS FOR PLASTIC PACKAGED MICROWAVE DIODES

L = 0.57 nH

L = 0.05 nH

C = 0.2 pF

C = 0.02 pF

L = 0.57 nH

C = 0.02 pF

C = 0.2 pF

Figure 3. SOD-323 Circuit Model

0

Isolation

-20

Simulated

Measured

Return Loss

-40

0.1

10.0

Frequency (GHz)

Figure 4. Measurement vs. Model Simulation

of a SOT-23 Package

0

Isolation

Return Loss

Simulated

-20

-40

0.1

Center Conductor

Ground

Measured

10.0

Frequency (GHz)

Figure 5. SOT-23 Validation:

Simulation vs. Measurement

Impedance Measurements

The HP 4291A Impedance Analyzer, an instrument based on mea-

suring the vector V/I with coverage from 1 MHz–1.8 GHz, was

also utilized to characterize inductance of the packages under

consideration. Measurements were taken on a group of PIN

diodes that were forward biased to low values of forward resis-

tance. The inductance values derived from these measurements

are shown in Table 1 and compare well with the values derived

from network analysis. The advantage of the direct impedance

measurement is the capability of a quick measurement without

the necessity of hard bonding the device to a substrate.

Alternative SOT-23 Designs for

Lower Inductance

To reduce the total inductance of the SOT-23 package, alternative

wire bonding schemes were studied. Figure 6 shows four

bonding wire designs considered in this study. The measured

inductance of these bonding schemes are shown on Table 1.

Validation of Simulated Model

Validation of the model was performed by placing the diode into a

test circuit that simulates a shunt connected switch. The test cir-

cuit was constructed using a Duriod microstrip board and the

device was placed as shown in Figure 5. This provided a different

operating environment because not only was the diode connected

differently, but the microstrip insulator had a different dielectric

constant.

The measured performance of this circuit was imported into the

circuit simulator and compared to a simulation using the circuit

model. Figure 6 shows good validation of the network analyzer

generated model.

Single

Parallel Wires

Common Cathode

Dual Contact

Figure 6. SOT-23 Configurations

Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com

2

July 21, 2005 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • 200311 Rev. A

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