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PDF APN1001 Data sheet ( Hoja de datos )
| Número de pieza | APN1001 | |
| Descripción | Circuit Models | |
| Fabricantes | Skyworks | |
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APPLICATION NOTE
APN1001: Circuit Models for
Plastic Packaged Microwave Diodes
Abstract
This paper reports on the measurement and establishment of
circuit models for SOT-23 and SOD-323 packaged diodes.
Results indicate that the 1.5 nH estimate for the SOT-23 is a
useful result, as is 1.2 nH for SOD-323 single packaged diodes.
It was also determined that the effective inductance of the
SOT-23 may be reduced to approximately 0.4 nH by adding a
second bond wire and modifying the microstrip line. Other lead
configurations, including parallel bond wires and common
cathode configurations, were also studied.
Introduction
Discrete, low-cost, surface mount semiconductor diodes are
attractive choices for UHF and microwave applications where
package parasitic may have a significant impact on performance.
The most common package styles are the SOT-23 and the
SOD-323 (Figure 1) which were neither designed nor intended
for RF service. A primary limitation to their high-frequency
performance, particularly in PIN diode shunt connected switches,
is parasitic package inductance, which limits high-frequency
isolation. The model information available from vendors of these
devices has been generally limited to estimates of inductance,
typically 1.5 nH, for single junction SOT-23 diodes. Establishing
a better model will enable circuit designers to better predict
performance and possibly give the manufacturer alternative
designs to reduce package parasitic effects.
SOT-23
SOD-323
Figure 1. Diode Package Styles
Package Modeling
Network Analysis
To create a high-frequency device model S-parameter, measure-
ments were taken over a wide frequency band so that resonance
and other high order effects would be included in the measure-
ments. This procedure utilizes an HP 8510C vector network
analyzer. The package under test was inserted into an Inter-
Continental Microwave test fixture as a series connected
element. This fixture uses a Thru-Reflect-Line calibration
procedure to produce accurate calibration and assures a
reference plane at the device under test.
Using this methodology, a circuit model was generated for each
of the devices as shown in Figures 2 and 3. These models pro-
duce very good correlation between the measured and simulated
performance as shown in Figure 4.
L = 0.65 nH
L = 0.05 nH
L = 0.7 nH
C = 0.13 pF
C = 0.01 pF
C = 0.015 pF
C = 0.13 pF
Figure 2. SOT-23 Circuit Model
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
200311 Rev. A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 21, 2005
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APPLICATION NOTE • APN1001: CIRCUIT MODELS FOR PLASTIC PACKAGED MICROWAVE DIODES
Copyright © 2002, 2003, 2004, 2005, Skyworks Solutions, Inc. All Rights Reserved.
Information in this document is provided in connection with Skyworks Solutions, Inc. (“Skyworks”) products or services. These materials, including the information contained herein, are provided
by Skyworks as a service to its customers and may be used for informational purposes only by the customer. Skyworks assumes no responsibility for errors or omissions in these materials or the
information contained herein. Skyworks may change its documentation, products, services, specifications or product descriptions at any time, without notice. Skyworks makes no commitment to
update the materials or information and shall have no responsibility whatsoever for conflicts, incompatibilities, or other difficulties arising from any future changes.
No license, whether express, implied, by estoppel or otherwise, is granted to any intellectual property rights by this document. Skyworks assumes no liability for any materials, products or
information provided hereunder, including the sale, distribution, reproduction or use of Skyworks products, information or materials, except as may be provided in Skyworks Terms and
Conditions of Sale.
THE MATERIALS, PRODUCTS AND INFORMATION ARE PROVIDED “AS IS” WITHOUT WARRANTY OF ANY KIND, WHETHER EXPRESS, IMPLIED, STATUTORY, OR OTHERWISE, INCLUDING FITNESS FOR A
PARTICULAR PURPOSE OR USE, MERCHANTABILITY, PERFORMANCE, QUALITY OR NON-INFRINGEMENT OF ANY INTELLECTUAL PROPERTY RIGHT; ALL SUCH WARRANTIES ARE HEREBY EXPRESSLY
DISCLAIMED. SKYWORKS DOES NOT WARRANT THE ACCURACY OR COMPLETENESS OF THE INFORMATION, TEXT, GRAPHICS OR OTHER ITEMS CONTAINED WITHIN THESE MATERIALS. SKYWORKS
SHALL NOT BE LIABLE FOR ANY DAMAGES, INCLUDING BUT NOT LIMITED TO ANY SPECIAL, INDIRECT, INCIDENTAL, STATUTORY, OR CONSEQUENTIAL DAMAGES, INCLUDING WITHOUT LIMITATION,
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Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
200311 Rev. A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • July 21, 2005
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