Datasheet > NBB-401

NBB-401

更新时间： 2024-09-16 03:46:59

品牌	Logo	应用领域
威讯 - RFMD		放大器
页数	文件大小	规格书
4页	46K
描述
Bias Scheme for NBB-Series Amplifiers

阅读下载

中文翻译

获取价格

数据手册

如果您发现信息不准确，欢迎纠错

NBB-401 数据手册

AN0014

Bias Scheme for NBB-Series Amplifiers

AN0014

Bias Scheme for NBB-Series Amplifiers

Introduction

RFMD’s NBB-series amplifiers are monolithic integrated circuits (IC's) using InGaP/GaAs HBT technology. The

NBB-series uses a Darlington-pair transistor configuration with bias and feedback resistors properly selected to deter-

mine the gain, input and output match and bias (both voltage and current) parameters. A schematic representation of the

NBB-series amplifier is shown in Figure 1.

+V_CC

NBB-Series

Amplifier

R_CC

R_F

R_BB

R_BIAS

Figure 1. Schematic representation of Darlington-pair feedback amplifier used in the NBB-series amplifiers.

(On-chip components are shown inside the dotted outline.)

The amplifier may be analyzed as a two-port network with the input (left) and output (right) as shown in Figure 1. The

output node is also used to provide bias to the amplifier through the bias network (top), which is shown in the figure. The

packaged part has a total of four ports: input, output and bias, and two ground connections for minimization of ground

inductance.

Bias Circuit Topology

The input voltage of the amplifier is fixed by the base-emitter voltage of Q₁and Q₂, and the output voltage is determined

by the voltage divider established by R_BBand R_F. Hence, the output voltage is a designed parameter and the amplifier is

controlled by the current supplied to the output node. Thus, the amplifier is biased using a current source rather than a

voltage source. The simplest current source is a resistor (R_CC) connected to a voltage source (V_CC) as shown in

Figure2.

The current source, comprising voltage source V_CCand resistor R_BIAS, should be selected such that the designed ampli-

fier voltage (V_D) appears at the output with the desired current (I_CC) flowing into the amplifier. The governing relationship

for the bias circuit shown in Figure 2 is:

(V_CC– V_D)

----------------------------

I_CC

Eq. 1

R_BIAS

The recommended amplifier current (I_CC) and design value of the amplifier voltage (V_D) for each NBB-series amplifier is

specified on the data sheet. Hence, if a V_CCis selected, then the desired R_CCmay be calculated from Equation 1. A bias

resistor table is provided with each datasheet which is calculated using this method.

15-23

12 3 4

中文翻译

下载PDF

与NBB-401相关器件

型号	品牌	获取价格	描述	数据表
NBB-402	RFMD	获取价格	CASCADABLE BROADBAND GaAs MMIC AMPLIFIER DC TO 8GHz
NBB-402_06	RFMD	获取价格	CASCADABLE BROADBAND GaAs MMIC AMPLIFIER DC TO 8GHz
NBB-402-E	RFMD	获取价格	CASCADABLE BROADBAND GaAs MMIC AMPLIFIER DC TO 8GHz
NBB-402-T1	RFMD	获取价格	CASCADABLE BROADBAND GaAs MMIC AMPLIFIER DC TO 8GHz
NBB-402-T3	RFMD	获取价格	CASCADABLE BROADBAND GaAs MMIC AMPLIFIER DC TO 8GHz
NBB-410	RFMD	获取价格	Bias Scheme for NBB-Series Amplifiers
NBB4-12GM30-E2	PF	获取价格	Inductive sensor
NBB-500	RFMD	获取价格	CASCADABLE BROADBAND GaAs MMIC AMPLIFIER DC TO 4GHz
NBB-500_07	RFMD	获取价格	CASCADABLE BROADBAND GaAs MMIC AMPLIFIER DC TO 4GHz
NBB-500-D	RFMD	获取价格	CASCADABLE BROADBAND GaAs MMIC AMPLIFIER DC TO 4GHz

与NBB-401相关文章

摩尔斯微电子在美国约书亚树国家公园测试 Wi-Fi HaLow
2024-09-18

10
贸泽上架Tallysman TW5386智能GNSS天线
2024-09-18

8
SL74HC10N：高性能三输入与非门解析
2024-09-03

90
AIC1781A 电池充电控制器深度解析
2024-09-03

80

产品中心

服务支持

精选活动

关于我们

帮助中心

NBB-401

NBB-401 数据手册

与NBB-401相关器件

与NBB-401相关文章

您还可以找

产品中心

服务支持

精选活动

关于我们

帮助中心

NBB-401

NBB-401 数据手册

与NBB-401相关器件

与NBB-401相关文章

您还可以找

您在本页遇到什么问题？