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부품번호 | ZNBG3001 기능 |
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기능 | FET BIAS CONTROLLER | ||
제조업체 | Zetex Semiconductors | ||
로고 | |||
전체 9 페이지수
FET BIAS CONTROLLER
ISSUE 1- AUGUST 1998
DEVICE DESCRIPTION
The ZNBG series of devices are designed to
meet the bias requirements of GaAs and
HEMT FETs commonly used in satellite
receiver LNBs, PMR, cellular telephones etc.
with a minimum of external components.
With the addition of two capacitors and a
resistor the devices provide drain voltage
and current control for 3 external grounded
source FETs, generating the regulated
negative rail required for FET gate biasing
whilst operating from a single supply. This
negative bias, at -3 volts, can also be used to
supply other external circuits.
The ZNBG3000/1 contains three bias stages.
A single resistor allows FET drain current to
be set to the desired level. The series also
offers the choice of drain voltage to be set
for the FETs, the ZNBG3000 gives 2.2 volts
drain whilst the ZNBG3001 gives 2 volts.
These devices are unconditionally stable
over the full working temperature with the
FETs in place, subject to the inclusion of the
recommended gate and drain capacitors.
These ensure RF stability and minimal
injected noise.
FEATURES
• Provides bias for GaAs and HEMT FETs
• Drives up to three FETs
• Dynamic FET protection
• Drain current set by external resistor
• Regulated negative rail generator
requires only 2 external capacitors
• Choice in drain voltage
• Wide supply voltage range
• QSOP surface mount package
ZNBG3000
ZNBG3001
It is possible to use less than the devices full
complement of FET bias controls, unused
drain and gate connections can be left open
circuit without affecting operation of the
remaining bias circuits.
In order to protect the external FETs the
circuits have been designed to ensure that,
under any conditions including power
up/down transients, the gate drive from the
bias circuits cannot exceed the range -3.5V
to 0.7V. Furthermore if the negative rail
experiences a fault condition, such as
overload or short circuit, the drain supply to
the FETs will shut down avoiding excessive
current flow.
The ZNBG3000/1 are available in QSOP16
packages for the minimum in devices size.
Device operating temperature is -40 to 70°C
to suit a wide range of environmental
conditions.
APPLICATIONS
• Satellite receiver LNBs
• Private mobile radio (PMR)
• Cellular telephones
• Single in single out C Band LNB
4-137
ZNBG3000
ZNBG3001
TYPICAL CHARACTERISTICS
16
Vcc = 5V
14
12
10
8
6
4
2
0
0
10 20 30
40
Rcal (k)
JFET Drain Current v Rcal
50
0.0
-0.5
-1.0
-1.5
-2.0
-2.5
-3.0
0
Note:- Operation with loads > 200µA
is not guaranteed.
Vcc = 5V
6V
8V
10V
0.2 0.4 0.6 0.8
External Vsub Load (mA)
Vsub v External Load
1.0
2.4
ZNBG3000
2.3
2.2
Vcc = 5V
6V
8V
2.1 10V
2.0
2 4 6 8 10 12 14 16
Drain Current (mA)
JFET Drain Voltage v Drain Current
2.2
ZNBG3001
2.1
2.0
Vcc = 5V
6V
8V
1.9 10V
1.8
2 4 6 8 10 12 14 16
Drain Current (mA)
JFET Drain Voltage v Drain Current
4-140
4페이지 ZNBG3000
ZNBG3001
APPLICATIONS INFORMATION (Continued)
The ZNBG devices have been designed to protect the external FETs from adverse operating
conditions. With a JFET connected to any bias circuit, the gate output voltage of the bias circuit
can not exceed the range -3.5V to 0.7V, under any conditions including powerup and powerdown
transients. Should the negative bias generator be shorted or overloaded so that the drain current
of the external FETs can no longer be controlled, the drain supply to FETs is shut down to avoid
damage to the FETs by excessive drain current.
The following diagram show the ZNBG3000/1 in typical LNB applications.
Single in/Single out C band LNB block diagram
4-143
7페이지 | |||
구 성 | 총 9 페이지수 | ||
다운로드 | [ ZNBG3001.PDF 데이터시트 ] |
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구매 문의 | 일반 IC 문의 : 샘플 및 소량 구매 ----------------------------------------------------------------------- IGBT, TR 모듈, SCR 및 다이오드 모듈을 포함한 광범위한 전력 반도체를 판매합니다. 전력 반도체 전문업체 상호 : 아이지 인터내셔날 사이트 방문 : [ 홈페이지 ] [ 블로그 1 ] [ 블로그 2 ] |
부품번호 | 상세설명 및 기능 | 제조사 |
ZNBG3000 | FET BIAS CONTROLLER | Zetex Semiconductors |
ZNBG3000Q16 | FET BIAS CONTROLLER | Zetex Semiconductors |
DataSheet.kr | 2020 | 연락처 | 링크모음 | 검색 | 사이트맵 |