參數(shù)資料
型號(hào): HMC268LM1
廠(chǎng)商: 美國(guó)訊泰微波有限公司上海代表處
英文描述: SMT LOW NOISE AMPLIFIER MMIC 20 - 32 GHz
中文描述: 貼片低噪聲放大器單片20 - 32千兆赫
文件頁(yè)數(shù): 7/8頁(yè)
文件大?。?/td> 174K
代理商: HMC268LM1
1 - 34
12 Elizabeth Drive, Chelmsford, MA 01824 Phone: 978-250-3343
Fax: 978-250-3373
Web Site: www.hittite.com
MICROWAVE CORPORATION
F
EBRUARY
2001
A
M
1
S
HMC268LM1 General Biasing & Application Circuit
Optimal biasing of the HMC268LM1 SMT two stage low noise amplifier Vdd, Vgg1 & Vgg2 DC ports is
described below. The LNA schematic is repeated below. Note the recommended addition of the external
bypass chip capacitor. For additional general MMIC amplifier biasing guidance, please refer to the Hittite
Microwave
MMIC Amplifier Biasing Procedure
found on page 8-8 in our February 2000 catalog or on
www.hittite.com
under the Application Note section.
IMPORTANT DC LIMITS!
When biasing the HMC268LM1 please note the following;
A) Do Not exceed 3.5 Vdc on internal circuit nodes Vds1 and Vds2 (internal Drain to Source volt-
ages). Calculate the Vds1&2 voltages from the LNA schematic above.
B) Do Not bias Vdd, Vgg1 & Vgg2 DC ports in such a way that Vgs becomes a positive voltage
(internal Gate to Source voltage).
HMC268LM1 Biasing Schemes for Performance Trade-Offs
The biasing may be adjusted slightly to achieve either low noise with lowest DC power consumption or low
noise with highest output power. Be sure to adhere to the
IMPORTANT DC LIMITS!
above while optimiz-
ing performance.
A) Low Noise and Low Power Consumption : Vdd = 3.5Vdc @ Idd = 30mA. Set Vgg1 = Vgg2.
B) Low Noise and High Output Power : Vdd = 4.0Vdc @ Idd = 45mA. Utilizing Vgg1 & Vgg2 nominal
bias is obtained for a typical Idd current of 30mA for the second or
output
stage and 15 mA for
the first stage. The first step to bias the amplifier is to tune the Vgg1 = -1.0Vdc and Vgg2 to drive
30mA for the full amplifier. Then Vgg1 is reduced to obtain Idd = 45 mA of current for the amplifier.
SMT LOW NOISE AMPLIFIER MMIC 20 - 32 GHz
HMC268LM1
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
HMC268LM1_01 制造商:HITTITE 制造商全稱(chēng):Hittite Microwave Corporation 功能描述:SMT MMIC LOW NOISE AMPLIFIER, 20 - 32 GHz
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