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| 型号： | ADF4602BCPZ |
| 厂商： | ANALOG DEVICES INC |
| 元件分类： | 无绳电话/电话 |
| 英文描述： | Single-Chip, Multiband 3G Femtocell Transceiver; Package: LFCSP: Leadform Chip Scale; No of Pins: 40; Temperature Range: Ind |
| 中文描述： | TELECOM, CELLULAR, RF AND BASEBAND CIRCUIT, QCC40 |
| 封装： | 6 X 6 MM, ROHS COMPLIANT, MO-220VJJD-2, LFCSP-40 |
| 文件页数： | 14/36页 |
| 文件大小： | 646K |
| 代理商： | ADF4602BCPZ |
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ADF4602
Rev. A | Page 21 of 36
GAIN CONTROL
HIGH BAND LNA 1
HIGH BAND LNA 2
LOW BAND LNA
RxGAIN[6:0]
VCMSEL
RxEN[1:0]
LNA
ACTIVE FILTER CHANGES
MIXER
TRANSCONDUCTANCE
0dB TO 18dB
3 × 6dB STEPS
VGA
–6dB TO +18dB
24 × 1dB STEPS
0dB TO 18dB
3 × 6dB STEPS
0dB TO 18dB
3 × 6dB STEPS
18dB TO 30dB (WCDMA)
27dB TO 39dB (CDMA)
2 × 6dB STEPS
RXHB2RF
RXBBI
RXBBIB
RXBBQ
RXBBQB
RXHB1RF
RXLBRF
LPF
BPF
DAC
RXBW_TOGGLE
ADC
LPF
PROGRAMMABLE OFFSET
CONTROL
÷2 OR
÷4
07
09
2-
036
Figure 44. Receiver Block Diagram
LNAs
The ADF4602 contains three tunable RF front ends suitable for
all major 3GPP frequency bands. Two are suitable for high band
operation in the region 1700 MHz to 2170 MHz. One is suitable
for operation from 824 MHz to 960 MHz. Thus, the three
integrated LNAs offer the designer the opportunity to create
multiband and regional specific variants with no additional
components.
LNA power control and internal band switching is fully
controlled by the serial interface.
The ADF4602 LNAs are designed for 50 Ω single-ended inputs,
thus further simplifying the front-end design and providing
easy matching with minimal components. Typically, a two-
component match is required: a series and shunt inductor.
Within the LNA, the signal is converted to a differential path
for signal processing in subsequent blocks within the receive
signal chain.
Interstage RF filtering is fully integrated, ensuring that external
out-of-band blockers are suitably attenuated prior to the mixer
stages. The LNA characteristic is designed to provide additional
filtering at the transmitter frequency offset.
The LNAs are enabled by programming bits rxbs[1:0] in Register 1.
LNA input RXHB1RF should be used for UMTS Band I operation,
and RXHB2RF should be used for UMTS Band II operation.
Mixers
High linearity quadrature mixer circuits are used to convert the
RF signal to baseband in-phase and quadrature components.
Although not shown in Figure 44, two mixer sections exist: one
optimized for the high band LNA outputs and one optimized
for the low band. The high band and low band mixer outputs
are combined and then driven directly into the first stage of the
baseband low-pass filter, which also acts to reduce the level of
the largest blocking signals, prior to baseband amplification.
Quadrature drive is provided to the mixers from the receiver
synthesizer section by the VCO transport system, which includes
a programmable divider, so that the same VCO is used for both
high and low bands. Excellent 90° quadrature phase and
amplitude match are achieved by careful design and layout of
the mixers and VCO transport circuits.
Baseband Section
The ADF4602 baseband section is a distributed gain and filter
function designed to provide a maximum of 54 dB gain with
60 dB gain control range. Through careful design, pass band
ripple, group delay, signal loss, and power consumption are
kept to a minimum. Filter calibration is performed during the
manufacturing process, resulting in a high degree of accuracy
and ease of use.
Three baseband filters are available on the ADF4602, as shown
in Table 5. Bits rxbw_toggle[2:0] are used to select the mode of
operation. The seventh order WCDMA filter with 1.92 MHz
cutoff ensures that good attenuation of the adjacent channel should
be used to meet blocking/adjacent channel selection specifications
in femtocell applications. The GSM filter has a 100 kHz cut-off
and is intended for use as a monitoring receiver in a home base
station. The fifth order WCDMA filter provides less attenuation
of the adjacent channel, so it should not be used in femtocell
applications.
The I and Q channels can be internally swapped, thus allowing
optimum PCB routing between radio and analog baseband.
This is achieved using the swapi and swapq bits.
Table 5. Receive Baseband Filter Modes
Mode
Filter Cutoff Frequency (fC)
Seventh Order WCDMA
1.92 MHz
Fifth Order WCDMA
1.92 MHz
GSM
100 kHz
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