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SKY65050-372LF

更新时间： 2024-02-13 20:13:56

品牌	Logo	应用领域
思佳讯 - SKYWORKS		晶体射频和微波射频放大器微波放大器晶体管 PC
页数	文件大小	规格书
12页	155K
描述
0.45-6.0 GHz Low Noise Transistor

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SKY65050-372LF 技术参数

是否无铅：	不含铅	是否Rohs认证：	符合
生命周期：	Active	包装说明：	2.20 X 1.35 MM, 1.10 MM HEIGHT, GREEN, SC-70, 4 PIN
Reach Compliance Code：	compliant	风险等级：	5.7
Samacsys Confidence：	4	Samacsys Status：	Released
Samacsys PartID：	278648	Samacsys Pin Count：	4
Samacsys Part Category：	Transistor	Samacsys Package Category：	Other
Samacsys Footprint Name：	SKY65050-372LF-2	Samacsys Released Date：	2019-09-13 11:54:17
Is Samacsys：	N	特性阻抗：	50 Ω
构造：	COMPONENT	增益：	13.5 dB
最大输入功率 (CW)：	10 dBm	JESD-609代码：	e3
最大工作频率：	6000 MHz	最小工作频率：	450 MHz
最高工作温度：	85 °C	最低工作温度：	-40 °C
射频/微波设备类型：	WIDE BAND MEDIUM POWER	端子面层：	Tin (Sn)
Base Number Matches：	1

SKY65050-372LF 数据手册

DATA SHEET • SKY65050-372LF LOW NOISE TRANSISTOR

Table 1. SKY65050-372LF Signal Descriptions

Pin #

Name

SOURCE

Description

Pin #

Name

SOURCE

Description

Source lead. Provides DC self-biasing point

and AC ground.

Source lead. Provides DC self-biasing point

and AC ground.

DRAIN

RF output. Requires external matching

network for optimum performance. Supply

voltage required through external RF choke.

GATE

RF input. Requires external matching

network for optimum performance.

Table 2. Self-Biasing Resistors

Resistor Value (Ω)

Drain Current (mA)

130

desired negative V^GSvalue. This simplifies the design by

eliminating the need for a second DC supply.

Functional Description

The SKY65050-372LF is a depletion mode pHEMT designed for

low noise, high frequency applications. The SKY65050-372LF has

a typical NF of 0.65 dB tested at the 2.4 GHz wireless LAN

frequency band. A gain of 15.5 dB typical is achieved using the

same circuit. If the frequency of operation is lowered to the 1 GHz

range, NF performance of the device can approach 0.5 dB

including input matching network losses.

Table 2 provides the resistor values used to properly bias the

SKY65050-372LF.

RF Matching Networks

The SKY65050-372LF Evaluation Board assembly diagram is

shown in Figure 12 and a circuit schematic is provided in

Figure 13. The schematic shows the recommended RF matching

network used for the 2.4 GHz wireless LAN frequency band. The

network was designed using de-embedded s- and n-parameters.

The circuit was primarily tuned for gain, NF, and input and output

return loss, while maintaining proper stability.

De-embedded scattering and noise parameters are provided in

addition to typical circuit topologies for commonly used frequency

bands. With an appropriate circuit, the SKY65050-372LF can be

used for many applications from 450 MHz up to 6 GHz. The

compact SC-70 package makes the SKY65050-372LF an ideal

low noise and low cost solution.

Optimal noise performance is attained when the impedance

presented to the input of the amplifier is equal to its minimum NF

impedance point. Components C1, C2, C3, L1, and L2 shown in

Figures 12 and 13 provide the necessary impedance match for NF

and input return loss. Circuit board and input matching structure

losses on the input of the amplifier directly add to the overall NF

of the amplifier. It is critical to minimize RF trace lengths and to

use high-Q components to achieve optimal NF performance.

Biasing

To properly bias a depletion mode pHEMT, both the gate and

drain of the device must be properly biased. At V^GS= 0 V and

VDS ≥ 2 V, the device is in a saturated state and draws the

maximum amount of current, I^DSS. The device typically achieves

the best noise performance at V^DS= 3 V and IDSS = 15 mA. To

control I^DS, VGS must be biased with a negative voltage supply.

Components R2 and C14 provide self biasing for the device and

RF grounding for one of the two source leads. Components C5

and L3 are placed on the opposing source lead and are used to

tune the transistor’s source inductance.

To eliminate the need for a negative DC supply, self-biasing

should be used when a resistor is placed between one of the

source leads and ground. A bypass capacitor should be placed in

parallel to this resistor to provide an RF ground and to ensure

performance remains unchanged at the operating frequency.

When current flows from drain to source and through the resistor,

the source voltage becomes biased above DC ground. The gate

pin of the device should be left unbiased at 0 V, which creates the

Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com

November 12, 2009 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 200967F

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