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PDF ( 数据手册 , 数据表 ) RF2690

零件编号 RF2690
描述 W-CDMA RECEIVE AGC AND DEMODULATOR
制造商 RF Micro Devices
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RF2690 数据手册, 描述, 功能
Preliminary
7
Typical Applications
• W-CDMA Systems
RF2690
W-CDMA RECEIVE AGC
AND DEMODULATOR
Product Description
The RF2690 is an integrated complete IF AGC amplifier
and quadrature demodulator designed for the receive
section of W-CDMA applications. It is designed to amplify
received IF signals, while providing 70dB of gain control
range, a total of 90dB gain, and demodulation to base-
band I and Q signals. This circuit is designed as part of
RFMD’s single mode W-CDMA chipset, which includes
the RF9678 as modulator and IF AGC and the RF2638 as
upconvertor. The IC is manufactured on an advanced
25GHz FT Silicon Bi-CMOS process, and is packaged in
a 20-pin, 4mmx4mm, leadless chip carrier.
1.00
0.90
0.60
0.24 typ
3 0.20
4.00
sq.
0.65
0.30
4 PLCS
2.10
sq.
12°
MAX
0.75
0.50
0.05
0.50
Dimensions in mm.
NOTES:
1 Shaded lead is Pin 1.
Note orientation of package.
2 Pin 1 identifier must exist on top surface of package by identification
mark or feature on the package body. Exact shape and size is optional.
3 Dimension applies to plated terminal: to be measured between 0.02 mm
and 0.25 mm from terminal end.
4 Package Warpage: 0.05 mm max.
5 Die Thickness Allowable: 0.305 mm max.
0.23
0.13
4 PLCS
Optimum Technology Matching® Applied
Si BJT
üSi Bi-CMOS
GaAs HBT
SiGe HBT
GaAs MESFET
Si CMOS
NC 2
NC 3
W-CDMA IN+ 4
W-CDMA IN- 5
6
20 1 17 18
Gain
Control
I/Q Cal
Div
4
Mode Control
& Biasing
8 7 9 10
14 I OUT+
13 I OUT-
15 ENCAL
16 FCLK
12 Q OUT+
11 Q OUT-
19 VREF2V
Package Style: LCC, 20-Pin, 4x4
Features
• Digitally Controlled Power Down Mode
• 2.7V to 3.3V Operation
• Digital LO Quadrature Divide-by-4
• IF AGC Amp with 70dB Gain Control
• 80dB Maximum Voltage Gain
Ordering Information
RF2690
W-CDMA Receive AGC and Demodulator
RF2690 PCBA Fully Assembled Evaluation Board
Functional Block Diagram
RF Micro Devices, Inc.
7628 Thorndike Road
Greensboro, NC 27409, USA
Tel (336) 664 1233
Fax (336) 664 0454
http://www.rfmd.com
7
Rev A4 010918
7-39







RF2690 pdf, 数据表
RF2690
Preliminary
Since the power gain to the input of the Op-Amp GP’=αGP, where GP is the power gain of demodulator for matched load.
Therefore, the demodulator power gain is 65+15=80dB.
AC Coupling in Evaluation Board
The output I and Q baseband signal is AC coupled for evaluation purposes only. The high-pass corner frequency is at
1/(2π RC)=1/(6.28*30k*100nF)=56Hz.
I and Q Output DC Voltage and Its Offset
Although the I and Q output is AC coupled on the evaluation board, in most applications, it would be DC coupled to the
ADC input buffer. The DC voltage at the IC output is VCC-1.6V with a possible variation of ±0.3V due to temperature and
tolerance. The differential circuit asymmetry would cause common mode DC offset to the extent of ±40mV.
Baseband Filter Calibration Process
The BB (baseband) filter calibration process is same for both WCDMA and GSM/DCS. After calibration is done, the
WCDMA mode sets the circuitry to have a 3dB bandwidth of 2.5MHz, the GSM/DCS mode (if the chip has GSM/DCS
mode) sets the circuitry to have a 3dB bandwidth of 250kHz.
The BB filter in the I and Q path needs to be calculated every time after power down. When the FCLK pin is connected to
a signal generator with 0dBm output level at 13.0MHz, a logic high at CALEN pin for 200µs will calibrate the filter to have
2.5MHz bandwidth with 10% accuracy when WCDMA mode is set, or to 250kHz bandwidth with 10% accuracy when
7 GSM mode is set. The calibration is done when the chip is powered on only. Calibration is independent from all other
conditions, e.g. the chip enable could be off.
The calibration circuitry consumes 400µA. When the calibration sequence is complete after 200µs, the ICC drops to
0 mA.
The 3dB bandwidth is defined to be from the reference level at 1MHz for WCDMA and at 50kHz for GSM/DCS. The 3dB
bandwidth is independent of VGC and VCC.
The filter can also be calibrated with different clock frequencies from 10MHz to 30MHz to tune the bandwidth over -40%
to +60% from its default 3dB bandwidth (2.5MHz for WCDMA and 250kHz for GSM). The 3dB bandwidth is linear with
clock frequency.
7-46
Rev A4 010918







RF2690 equivalent, schematic
RF2690
10.0
0.0
IIP3 versus VGC (Temp. +25oC, - 40oC, +85oC)
(IF Freq. 190MHz, LO Freq. 760MHz @ -10dBm, VCC=3.3V, VGC=2.4V to 0.3V)
IIP3 @3.3V,Temp.25C
IIP3 @3.3V,Temp.- 40C
IIP3 @3.3V,Temp. +85C
-10.0
-20.0
-30.0
-40.0
-50.0
-60.0
0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4
VGC (V)
IIP3 versus VGC (Temp. -40oC)
7
0.0
(IF Freq. 190MHz, LO Freq. 760MHz @ -10dBm, VCC=3.3V, 3.0V, 2.7V, VGC=2.4V to 0.3V)
IIP3 @3.3V,Temp.- 40C
IIP3 @3.0V,Temp.- 40C
-10.0
IIP3 @2.7V,Temp.- 40C
-20.0
-30.0
-40.0
-50.0
-60.0
0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4
VGC (V)
0.0
-5.0
-10.0
IIP3 versus VGC (Temp. 25oC)
(IF Freq. 190MHz, LO Freq. 760MHz @ -10dBm, VCC=3.3V ,3.0V, 2.7V, VGC=2.4V to 0.3V)
IIP3 @3.3V,Temp.25C
IIP3 @3.0V,Temp.25C
IIP3 @2.7V,Temp.25C
-15.0
-20.0
-25.0
-30.0
-35.0
-40.0
-45.0
-50.0
0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4
VGC (V)
7-54
Preliminary
IIP3 versus VGC (Temp. +85oC)
(IF Freq. 190MHz, LO Freq. 760MHz @ -10dBm, VCC=3.3V, 3.0V, 2.7V, VGC=2.4V to
0.3V)
5.0
0.0 IIP3 @3.3V,Temp. +85C
IIP3 @3.0V,Temp.+85C
-5.0 IIP3 @2.7V,Temp. +85C
-10.0
-15.0
-20.0
-25.0
-30.0
-35.0
-40.0
-45.0
-50.0
0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4
VGC (V)
Rev A4 010918










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