RF9678 Datasheet PDF - RF Micro Devices
|Description||W-CDMA TRANSMIT MODULATOR AND IF AGC|
|Manufacturers||RF Micro Devices|
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5 W-CDMA TRANSMIT MODULATOR AND IF AGC
• W-CDMA Systems
• EDGE Systems
• CDMA Systems
• TDMA Systems
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
16 15 14 13
11 BG OUT
.65 4 PLCS
Dimensions in mm.
1 Shaded Pin is Lead 1.
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
• 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
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
Rev A4 010622
Quadrature modulator performance can be correlated to a set of specifications known as Carrier and Sideband Suppres-
sion. In addition, Sideband Suppression can be correlated with the amplitude and phase balance of the In-Phase (I) and
Quadrature (Q) signals and Carrier Suppression can be correlated to the DC offset between the I and Q signals (see Fig-
ure 1). For a more thorough discussion of the theory and mathematics behind these specifications refer to RF Micro
Devices application note AN0001.
Σ RF Output Signal
Figure 1. Quadrature Modulator Block Diagram
Effects of Carrier Suppression and Sideband Suppression on W-CDMA (QPSK) Modulation
W-CDMA signals may be displayed on a vector signal analyzer as a collection of points called a constellation. Each point
in the constellation is called a symbol and is representative of a bit sequence. In QPSK modulation, there are four sym-
bols and each symbol is representative of two data bits (see Figure 2). The I and Q signals are added together to create
a vector of precise phase and amplitude. The vector is then sampled at a rate called the symbol rate and it's position at
these intervals corresponds to the target symbol locations. Errors in the phase and amplitude of the I and Q signals will
translate to errors in the vector's phase and amplitude. This phase and amplitude error will result in a displacement of the
vector from it's target symbol point. A measurement of this error is called the Error Vector Magnitude (EVM) and it repre-
sents the magnitude of the displacement of the actual vector from it's target location.
CF 380 MHz Meas Signal
SR 3.84 MHz Constellation
Figure 2. W-CDMA (QPSK) Constellation
QPSK constellation points exist on a circle of constant radius around the origin. Amplitude errors result in symbol points
being displaced either inside or outside of their target locations on this circle. Phase errors result in symbol points being
displaced on an arc either to the left or right of their target location. Finally, DC offset errors cause the origin to shift,
resulting in a constant I and Q offset of all target points (see Figure 3).
Rev A4 010622
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|RF9678||The function is W-CDMA TRANSMIT MODULATOR AND IF AGC.|
RF Micro Devices
|RF9678PCBA||The function is W-CDMA TRANSMIT MODULATOR AND IF AGC.|
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