Datasheet > NBB-301

NBB-301

更新时间： 2024-11-09 03:46:59

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威讯 - RFMD		放大器
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Bias Scheme for NBB-Series Amplifiers

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NBB-301 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

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与NBB-301相关器件

型号	品牌	获取价格	描述	数据表
NBB-302	RFMD	获取价格	CASCADABLE BROADBAND GaAs MMIC AMPLIFIER DC TO 12GHz
NBB-302_06	RFMD	获取价格	CASCADABLE BROADBAND GaAs MMIC AMPLIFIER DC TO 12GHz
NBB-302_1	RFMD	获取价格	CASCADABLE BROADBAND GaAs MMIC AMPLIFIER DC TO 12GHz
NBB-302-E	RFMD	获取价格	CASCADABLE BROADBAND GaAs MMIC AMPLIFIER DC TO 12GHz
NBB-302-T1	RFMD	获取价格	CASCADABLE BROADBAND GaAs MMIC AMPLIFIER DC TO 12GHz
NBB-302-T3	ETC	获取价格	Amplifier. Other
NBB-310	RFMD	获取价格	CASCADABLE BROADBAND GaAs MMIC AMPLIFIER DC TO 12GHz
NBB-310_07	RFMD	获取价格	CASCADABLE BROADBAND GaAs MMIC AMPLIFIER DC TO 12GHz
NBB-310-D	RFMD	获取价格	CASCADABLE BROADBAND GaAs MMIC AMPLIFIER DC TO 12GHz
NBB-310-PCBA-41X	RFMD	获取价格	CASCADABLE BROADBAND GaAs MMIC AMPLIFIER DC TO 12GHz

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