Datasheet > AD8311

AD8311

更新时间： 2024-01-14 03:56:27

品牌	Logo	应用领域
亚德诺 - ADI		控制器 GSM
页数	文件大小	规格书
24页	867K
描述
50 dB GSM PA Controller

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AD8311 数据手册

50 dB GSM PA Controller

AD8311

Its high sensitivity allows control at low signal levels, thus

reducing the amount of power that needs to be coupled to the

detector. For convenience, the signal is internally ac-coupled.

This high-pass coupling, with a corner at approximately

0.016 GHz, determines the lowest operating frequency. Thus,

the source can be dc-grounded.

FEATURES

Complete RF detector/controller function

>50 dB range at 0.9 GHz (−48 dBm to +3 dBm re 50 Ω)

Accurate scaling from 0.1 GHz to 2.5 GHz

Temperature-stable linear-in-dB response

Log slope of 23 mV/dB, intercept at −60 dBm at 0.9 GHz

True integration function in control loop

Low power: 20 mW at 2.7 V

The AD8311 provides a voltage output, VAPC, which has the

voltage range and current drive to directly connect to the gain

control pin of most handset power amplifiers. VAPC can swing

from 300 mV above ground to within 200 mV below the supply

voltage. Load currents of up to 6 mA can be supported.

APPLICATIONS

Single, dual, and triple band mobile handset (GSM, DCS,

EDGE)

The setpoint control input is applied to pin VSET and has an

operating range of 0.25 V to 1.4 V. The associated circuit

determines the slope and intercept of the linear-in-dB

measurement system; these are nominally 23.6 mV/dB and

−59.7 dBm at 0.9 GHz. Further simplifying the application of

the AD8311, the input resistance of the setpoint interface is over

35 MΩ, and the bias current is typically 0.26 µA.

Transmitter power control

GENERAL DESCRIPTION

The AD8311 is a complete low cost subsystem for the precise

control of RF power amplifiers operating in the frequency range

0.1 GHz to 2.5 GHz and over a typical dynamic range of 50 dB.

It is intended for use in cellular handsets and other battery-

operated wireless devices. The log amp technique provides a

much wider measurement range and better accuracy than

controllers using diode detectors. In particular, its temperature

stability is excellent over a specified range of −40°C to +85°C.

The AD8311 is available in a 6-ball wafer-level chip scale

package (WLCSP), 1.0 mm × 1.5 mm, and consumes 7.6 mA

from a 2.7 V to 5.5 V supply.

FUNCTIONAL BLOCK DIAGRAM

LOW NOISE

BAND GAP

REFERENCE

LOW NOISE

GAIN BIAS

VPOS

VAPC

⋅ 1.35

HI-Z

LOW NOISE

RAIL-TO-RAIL BUFFER

FLTR

DET

RFIN

10dB

VSET

23mV/dB

OFFSET

COMPENSATION

INTERCEPT

POSITIONING

250mV TO

1.4V = 50dB

COMM

Figure 1.

Rev. 0

Information furnished by Analog Devices is believed to be accurate and reliable.

However, no responsibility is assumed by Analog Devices for its use, nor for any

infringements of patents or other rights of third parties that may result from its use.

Specifications subject to change without notice. No license is granted by implication

or otherwise under any patent or patent rights of Analog Devices. Trademarks and

registered trademarks are the property of their respective owners.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781.329.4700

Fax: 781.461.3113

www.analog.com

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与AD8311相关器件

型号	品牌	获取价格	描述	数据表
AD8311ACBZ-P2	ADI	获取价格	50 dB GSM PA Controller
AD8311ACBZ-P7	ADI	获取价格	50 dB GSM PA Controller
AD8311-EVAL	ADI	获取价格	50 dB GSM PA Controller
AD8312	ADI	获取价格	100 MHz-2.7 GHz, 45 dB RF Log Detector
AD8312_05	ADI	获取价格	50 MHz to 3.5 GHz, 45 dB RF Detector
AD8312ACBZ-P2	ADI	获取价格	50 MHz to 3.5 GHz, 45 dB RF Detector
AD8312ACBZ-P7	ADI	获取价格	50 MHz to 3.5 GHz, 45 dB RF Detector
AD8312ACPZ-REEL7	ADI	获取价格	IC SPECIALTY TELECOM CIRCUIT, BGA6, 1 X 1.50 MM, LEAD FREE, WLCSP-6, Telecom IC:Other
AD8312ACPZ-WP	ADI	获取价格	IC SPECIALTY TELECOM CIRCUIT, BGA6, 1 X 1.50 MM, WLCSP-6, Telecom IC:Other
AD8312-EVAL	ADI	获取价格	50 MHz to 3.5 GHz, 45 dB RF Detector

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