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參數(shù)資料
| 型號(hào)： | TSH691 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | LOW COST 40MHz - 1GHz AMPLIFIER |
| 中文描述： | 低成本40MHz的- 1GHz的放大器 |
| 文件頁數(shù)： | 6/10頁 |
| 文件大?。?/td> | 139K |
| 代理商： | TSH691 |
Figure1 :
Typical 300MHz-1000MHzBiasing Circuit
CIRCUIT DESCRIPTION
TheTSH691is50
input/outputinternallymatched
from 300MHz to 1000MHz. Dueto its open-collec-
tor structure, the output RF port must be tied to
V
CC2
. The pin 8 allowsa bias currentadjust to set
the output power and the gain.The circuit is pack-
agedinSO8forthermaldissipationconsiderations.
MATCHING
Within the300-1000MHzband,althoughthe circuit
is matched,the outputreturn loss can be improved
by adding a serial inductor (L2) between the RF
output and V
CC2
(56nH @450MHz and 10nH
@900MHz).Below 300MHz, using the S-parame-
ters matrix, specific input/output matching net-
works can be calculated to maximize electrical
performances.
DC BLOCKING
Because input/output are respectivelyinternal/ex-
ternal biased, DC blocks (C1, C2) are recom-
mended on both RF ports to guarantee a DC
isolationfromthenextcells.Above500MHz,100pF
is suggested whereas below, 1nF is betterand far
below (less than 100MHz),10nF is prefered.
BIASING
The amplifier can operate in the range of 1,5V to
5V and offersa bias current adjust function(Vbias
pin) which enables the trimming of the RF output
power(AB classAmplifier) by tuninga series vari-
able resistor (Rbias).
When Vbias is wired to the V
CC
rail, the current
consumptionis maximized gettingthe bestlinearity
(Aclass Amplifier) whereas biasingto Ground,the
IC is set in power down mode.
For higher supply voltage than 4V to reach high
output power, the serial resistor (R1) is strongly
recommended to increase the efficiency of the
amplifierand thereforereducethe thermaldissipa-
tion of the circuit.
DECOUPLING
As with any RF devices,the supply voltagedecou-
pling must be done carefully using a 1nF bypass
capacitor (C3, C5) placed as close as possible to
the device pins and could be also improved by
adding a 150nH RF choke inductance (L1). Con-
cerningthe Vbiaspin, a10nFdecouplingcapacitor
(C4)is recommendedwhileplacingonboardis not
critical.Note that SurfaceMounted Devices(SMD)
components are prefered for RF applications due
to theright behaviourin highfrequencieswhile low
inductor values (few 10nH) can be printed on
board.
APPLICATIONSINFORMATION
TSH691
6/10
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TSH691ID | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:LOW COST 40MHz - 1GHz AMPLIFIER |
| TSH692ID | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:IC-SM-900MHZ AMP |
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| TSH70CD | 功能描述:運(yùn)算放大器 - 運(yùn)放 Single Wideband RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補(bǔ)償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
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