Datasheet > LMH2120

LMH2120

更新时间： 2024-09-10 11:37:15

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Linear RMS power detector particularly suited for accurate

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LMH2120 数据手册

National Semiconductor

Application Note 2064

Gerrit de Wagt and Jaimy de Koning

July 21, 2010

LMH2120 Evaluation Board

tercept only, reducing calibration effort significantly. The de-

vice operates with a single supply from 2.7V to 5V. The

LMH2120 has an RF power detection range from -35 dBm to

5dBm and is ideally suited for use in combination with a di-

rectional coupler. Alternatively, a resistive divider can be

used.

General Description

The LMH2120 is a 40 dB Linear RMS power detector

particularly suited for accurate power measurement of

modulated RF signals that exhibit large peak-to-average ra-

tios; i.e., large variations of the signal envelope. Such signals

are encountered in W-CDMA and LTE cell phones. The RMS

measurement topology inherently ensures a modulation in-

sensitive measurement.

The device is active for EN=High − otherwise it is in a low

power-consumption shutdown mode. To save power and pre-

vent discharge of an external filter capacitance, the output

(OUT) is high impedance during shutdown.

The device has an RF frequency range from 50 MHz to 6GHz.

It provides an accurate temperature- and supply- insensitive

output voltage that relates linearly to the RF input power (Fig-

ure 5). The LMH2120's excellent conformance to a linear

response enables an easy integration by using slope and in-

The LMH2120 power detector is offered in a tiny 6-bump mi-

croSMD package.

Figure 1 shows the LMH2120 Evaluation Board.

30125916

FIGURE 1. LMH2120 Evaluation Board

ply voltages and input signals can be applied to the on-board

connectors. The supply voltage is applied with connectors

P21 (VDD) and P22 (GND). The RF input signal is applied by

SMA connector P1. This RF signal is applied through an RF

generator and is connected with a 50Ω SMA cable. The de-

tector output can be measured via BNC connector P3.

Basic Operation

The circuit operates with a single supply form 2.7V to 5V and

has an RF power detection range from −35 dBm to 5dBm.

The board consist of a single LMH2120 along with external

components soldered on a printed circuit board. External sup-

301259

www.national.com

12 3 4 5 6

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与LMH2120相关器件

型号	品牌	获取价格	描述	数据表
LMH2120UM	NSC	获取价格	IC TELECOM, CELLULAR, RF AND BASEBAND CIRCUIT, PBGA6, MICRO SMD-6, Cellular Telephone Circ
LMH2120UM/NOPB	TI	获取价格	具有 40 dB 动态范围的 6GHz 线性 RMS 功率检测器 \| YFZ \| 6 \|
LMH2120UMX	NSC	获取价格	IC TELECOM, CELLULAR, RF AND BASEBAND CIRCUIT, PBGA6, MICRO SMD-6, Cellular Telephone Circ
LMH2120UMX/NOPB	TI	获取价格	具有 40 dB 动态范围的 6GHz 线性 RMS 功率检测器 \| YFZ \| 6 \|
LMH2121	TI	获取价格	具有 40dB 动态范围的 3GHz 快速响应线性功率检测器
LMH2121TME	TI	获取价格	IC TELECOM, CELLULAR, RF AND BASEBAND CIRCUIT, Cellular Telephone Circuit
LMH2121TME/NOPB	TI	获取价格	具有 40dB 动态范围的 3GHz 快速响应线性功率检测器 \| YFQ \| 4 \| -4
LMH2121TMX/NOPB	TI	获取价格	具有 40dB 动态范围的 3GHz 快速响应线性功率检测器 \| YFQ \| 4 \| -4
LMH2180	TI	获取价格	LMH2180 75 MHz Dual Clock Buffer
LMH2180	NSC	获取价格	75 MHz Dual Clock Buffer

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