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RF9678PCBA 데이터시트 PDF




RF Micro Devices에서 제조한 전자 부품 RF9678PCBA은 전자 산업 및 응용 분야에서
광범위하게 사용되는 반도체 소자입니다.


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부품번호 RF9678PCBA 기능
기능 W-CDMA TRANSMIT MODULATOR AND IF AGC
제조업체 RF Micro Devices
로고 RF Micro Devices 로고


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RF9678PCBA 데이터시트, 핀배열, 회로
Preliminary
RF9678
5 W-CDMA TRANSMIT MODULATOR AND IF AGC
Typical Applications
• W-CDMA Systems
• EDGE Systems
• CDMA Systems
• TDMA Systems
Product Description
The RF9678 is an integrated complete quadrature modu-
lator and IF AGC amplifier designed for the transmit sec-
tion of W-CDMA applications. It is designed to modulate
baseband I and Q signals, and amplify the resulting IF
signals while providing 55dB of gain control range. This
circuit is designed as part of RFMD’s single mode
W-CDMA Chipset, which also includes the RF2679
W-CDMA Receive IF AGC and Demodulator. The IC is
manufactured on an advanced Silicon Bi-CMOS process,
and is supplied in a16-pin leadless chip carrier.
Optimum Technology Matching® Applied
Si BJT
üSi Bi-CMOS
GaAs HBT
SiGe HBT
GaAs MESFET
Si CMOS
16 15 14 13
VGC 1
Gain Control
12 NC
VCC2 2
MOD+ 3
MOD- 4
5
S
Quad
/2
67
11 BG OUT
10 LO+
9 LO-
8
1.00
.80 0.85
.65
.60
.24 typ
.35
2 .23
4.00
sq.
.65
.30
4 PLCS
1.85
1.55 sq.
12°
max
.05
.01
NOTES:
.75
.50
.23
.13
.65 4 PLCS
Dimensions in mm.
1 Shaded Pin is Lead 1.
2
Dimension applies to plated terminal and is measured between 0.02 mm and
0.25 mm from terminal end.
3 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.
4 Package Warpage: 0.05 max.
5 Die thickness allowable: 0.305 mm max.
Package Style: LCC, 16-Pin, 4x4
Features
• Digitally Controlled Power Down Modes
• 2.7V to 3.3V Operation
• Digital LO Quadrature Divider
• AGC Linearity/Current Consumption Var.
• IF AGC Amp with 55dB Gain Control
Ordering Information
RF9678
W-CDMA Transmit Modulator and IF AGC
RF9678 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
5
Rev A4 010622
5-91




RF9678PCBA pdf, 반도체, 판매, 대치품
RF9678
Preliminary
Pin
15
16
Pkg
Base
Function
ISET
PD
GND
Description
Interface Schematic
Connected to ground through an external resistor. The value can be
varied to change the current in the AGC for optimum linearity and cur-
rent consumption.
Power down control for overall circuit. When logic “high” (VCC-0.7V),
all circuits are operating; when logic “low” (0.5V), all circuits are
turned off. The input impedance of this pin is >10k. A DC voltage less
than or equal to the maximum allowable VCC may be applied to this pin
when no voltage is applied to the VCC pins.
Ground connection. The backside of the package should be soldered to
a top side ground pad which is connected to the ground plane with mul-
tiple vias.
PD
5
5-94
Rev A4 010622

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RF9678PCBA 전자부품, 판매, 대치품
Preliminary
RF9678
Ref Lvl
-3 dBm
-10
-20
-30
-40
-50
Marker 1 [T1]
-21.97 dBm
380.01503006 MHz
RBW 30 kHz
VBW 300 kHz
SWT 2 s
RF Att
Unit
20 dB
dBm
1 [T1]
-21.97 dBm A
380.01503006 MHz
CH PWR
-2.62 dBm
1
ACP Up
-50.30 dB
ACP Low
-49.72 dB
1RM
EXT
-60
-70
-80
-90
cl1
-100
C0
cl1
C0
cu1
cu1
Center 380 MHz
Date:
6.FEB.2001 00:47:49
1.46848 MHz/
Span 14.6848 MHz
Figure 4. W-CDMA Spectral Plot
Adjusted Performance
In theory, an ideal quadrature modulator will completely suppress the carrier and sideband signals. In practice, due to
process and packaging effects, real quadrature modulators lack the balance necessary to completely cancel the carrier
and sideband signals. The imbalance caused by process and packaging effects is usually very small and may be cor-
rected by preadjusting the input signals to the modulator. This process of adjusting the input signals to minimize the car-
rier and sideband suppression is known as optimization.
Sideband suppression results from the summing together of the I and Q channel mixer outputs. In an ideal quadrature
modulator, at the summing point the sideband signals from the I and Q mixers are 180° out of phase and have equal
magnitudes. In a real modulator, the amplitude and phase are not exactly balanced and 100% cancellation does not
occur. The problem is corrected by introducing amplitude and phase corrections before applying a signal to the modula-
tor. Maximum sideband suppression is achieved when the amplitude and phase errors introduced by the modulator are
compensated for.
Complete carrier suppression occurs when there is no DC offset between the mixer signal input and the mixer reference
voltage (i.e., ISIG+ and ISIG-). In real devices, zero DC offset is difficult to achieve. This problem is corrected by intro-
ducing a DC offset of equal and opposite magnitude before applying the signal to the modulator. The internal error is
thereby canceled and maximum carrier suppression is achieved.
5
Rev A4 010622
5-97

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RF9678PCBA

W-CDMA TRANSMIT MODULATOR AND IF AGC

RF Micro Devices
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