BCR400 [INFINEON]
Application Considerations for the Integrated Bias Control Circuits; 申请注意事项的集成偏置控制电路
| 型号： | BCR400 |
| 厂家： | 
Infineon |
| 描述： | Application Considerations for the Integrated Bias Control Circuits |
| 文件： | 总3页 (文件大小：96K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Silicon Discrete Components
Application Note No. 014
Application Considerations
for the Integrated Bias Control Circuits
BCR400R and BCR400W
Figure 1
RF Transistor Controlled by BCR400
Operating Point
• BCR400 stabilizes the operating current (i.e. IC or ID), the collector (or drain) voltage
depends on the supply voltage: VCE = VS - 0.65 V
• The voltage drop of approximately 0.65 V on Rext (i.e. between pins 3 and 4 of
BCR400) is almost constant (Rext = 0.65 V x IC)
• In case a lower VCE is really required (e.g. to prevent exceeding of maximum VCE or
VDS ratings), an additional resistor R = (VS - VCE - 0.65 V) / IC can be inserted either
between pin 4 and collector (or drain) or in series to the supply voltage VS, thus
providing an additional voltage drop.
Application Note
1
2000-07-27
Application Considerations for the Integrated
Bias Control Circuits BCR400R and BCR400W
Stability
BCR400 stabilizes bias current of transistors in an active control loop. In order to avoid
loop oscillation (hunting), time constants must be chosen adequately, i.e. C1 >= 10 x C2.
It is strongly recommended that the entire DC circuit is analyzed and optimized for
stability with one of the commercially available SPICE simulators.
Thermal considerations
The collector or drain current of a stabilized RF transistor does not directly affect
BCR400, as it must only provide the base current (or gate bias current). Even as a stand-
alone current source it is not possible to exceed Ptot (up to Ts = 115°C), if the maximum
ratings of Vs and Icontr are adhered to (see data sheet).
Preliminary SPICE Parameters
*****************************************************************
.MODEL DI400 D(
+
+
+
+
IS= 6.00E-15
IBV= 1.00E-04 BV= 7.50E+01
M= 1.00E-01 CJO= 6.87E-13 EG= 1.11E+00
N= 1.20E+00
RS= 5.0E+01
TT= 8.66E-09 VJ= 2.00E+00 XTI= 5.00E+00)
* one internal Diode of BCR400
*****************************************************************
.MODEL TR400 PNP(
+
+
+
+
+
+
+
+
+
+
BF= 3.00E+02
BR= 3.38E+00
CJC= 2.00E-12
EG= 1.11E+00
CJE= 1.56E-11 CJS= 0.00E+00
FC= 8.28E-01
IS= 0.30E-14
IKF= 1.00E-02 IKR= 0.40E-02 IRB= 0.30E-06
ISC= 2.00E-14 ISE= 0.50E-13 ITF= 0.50E-01
MJC= 3.49E-01 MJE= 4.18E-01 MJS= 3.30E-01
NE= 1.83E+00
RB= 1.00E+02 RBM= 1.00E+01
TF= 6.05E-10
NC= 1.19E+00
NF= 1.00E+00
NR= 1.00E+00 PTF= 0.00E+00
RC= 5.00E+00
RE= 2.00E-01
TR= 0.00E+00 VAF= 5.90E+01 VAR= 1.74E+01
VJC= 3.00E-01 VJE= 8.00E-01 VJS= 7.50E-01 VTF= 4.39E+00
XCJC= 1.00E+00 XTB= 0.00E+00 XTF= 5.81E+00 XTI= 1.50E+00)
*****************************************************************
* internal parallel resistance Rint= 6.5 kOhm
* Rb= 75 kOhm
*****************************************************************
Application Note
2
2000-07-27
Application Considerations for the Integrated
Bias Control Circuits BCR400R and BCR400W
Revision History:
2000-07-27
DS0
Previous Version:
Page
Subjects (major changes since last revision)
Document’s layout has been changed: 2002-Aug.
For questions on technology, delivery and prices please contact the Infineon
Technologies Offices in Germany or the Infineon Technologies Companies and
Representatives worldwide: see our webpage at http://www.infineon.com.
Edition 2000-07-27
Published by Infineon Technologies AG,
St.-Martin-Strasse 53,
81669 München, Germany
© Infineon Technologies AG 2002.
All Rights Reserved.
Attention please!
The information herein is given to describe certain components and shall not be considered as warranted
characteristics.
Terms of delivery and rights to technical change reserved.
We hereby disclaim any and all warranties, including but not limited to warranties of non-infringement, regarding
circuits, descriptions and charts stated herein.
Infineon Technologies is an approved CECC manufacturer.
Information
For further information on technology, delivery terms and conditions and prices please contact your nearest
Infineon Technologies Office in Germany or our Infineon Technologies Representatives worldwide.
Warnings
Due to technical requirements components may contain dangerous substances. For information on the types in
question please contact your nearest Infineon Technologies Office.
Infineon Technologies Components may only be used in life-support devices or systems with the express written
approval of Infineon Technologies, if a failure of such components can reasonably be expected to cause the failure
of that life-support device or system, or to affect the safety or effectiveness of that device or system. Life-support
devices or systems are intended to be implanted in the human body, or to support and/or maintain and sustain
and/or protect human life. If they fail, it is reasonable to assume that the health of the user or other persons may
be endangered.
©2020 ICPDF网 联系我们和版权申明