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参数资料
| 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： | 11/36页 |
| 文件大小： | 646K |
| 代理商： | ADF4602BCPZ |
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ADF4602
Rev. A | Page 19 of 36
THEORY OF OPERATION
TRANSMITTER DESCRIPTION
TXBBI
TXBBIB
TXBBQ
TXBBQB
GAIN CONTROL
TXPWR_SET[11:0]
–90 DEGREES
÷2
TXBs
TESTQ, SWAP_Q
TESTI, SWAP_I
Σ
LPF
PA
TX
OUTPUT
LB ONLY
DIVIDER
DIVIDER AND
QUAD GEN
INTEGRATED
BALUN
07
09
2-
034
Figure 42. Transmitter Block Diagram
The ADF4602 contains a highly innovative low noise variable
gain direct conversion transmitter architecture, that removes
the need for external transmit SAW filters. The direct conversion
architecture significantly reduces the risk of transmit harmonics
across all bands due to the simplified nature of the frequency
plan. See Figure 42 for a block diagram.
I/Q Baseband
The baseband interface for the I and Q channels is a differential,
dc-coupled input, supporting a wide range of input common-
mode voltages (VCM). The allowable input common-mode range
is 1.05 V to 1.4 V. The maximum signal swing allowed is
550 mV peak differential. This corresponds to a 1.1 V peak-to-
peak differential on either the I or Q channel. Figure 43 shows
a graphical definition of peak differential voltage and VCM.
The baseband input signals pass through a second order
Butterworth filter prior to the quadrature modulator. The cut-
off frequency is 4 MHz. This gives some rejection of the DAC
images. The filter also helps to suppress any spurious signals
that might be coupled to the baseband terminals on
the PCB.
For ease of PCB routing between the ADF4602 and the transmit
DAC, the I and Q differential inputs can be internally swapped.
For user test purposes, the I and Q inputs can also be internally
shorted together and a dc offset applied. This produces a large
carrier at the RF output, which is useful for signal path integrity
testing.
VCM
I OR Q
IB OR QB
PEAK V DIF
VOLTS
TIME
07
09
2-
0
35
Figure 43. Transmit Baseband Input Signals
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