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AD8311 데이터시트(PDF) 1 Page - Analog Devices

부품명 AD8311
상세설명  50 dB GSM PA Controller
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50 dB GSM PA Controller
AD8311
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
www.analog.com
Fax: 781.461.3113
© 2005 Analog Devices, Inc. All rights reserved.
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
APPLICATIONS
Single, dual, and triple band mobile handset (GSM, DCS,
EDGE)
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.
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.
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.
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.
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
10dB
OFFSET
COMPENSATION
INTERCEPT
POSITIONING
10dB
10dB
10dB
DET
DET
DET
DET
DET
RFIN
⋅ 1.35
HI-Z
LOW NOISE
RAIL-TO-RAIL BUFFER
VSET
23mV/dB
250mV TO
1.4V = 50dB
FLTR
VAPC
LOW NOISE
BAND GAP
REFERENCE
LOW NOISE
GAIN BIAS
COMM
VPOS
V
I
Figure 1.


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