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| 型号： | ADF4602BCPZ-RL |
| 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： | 15/36页 |
| 文件大小： | 646K |
| 代理商： | ADF4602BCPZ-RL |
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ADF4602
Rev. A | Page 22 of 36
The receive baseband outputs have a programmable common
mode voltage of 1.2 V or 1.4 V, selectable via the vcmsel bit in
Register 15.
Gain Control
Gain control is distributed throughout the receive signal chain
as shown in Figure 46. The RF front end contains 30 dB of control
range: 18 dB in the LNA and 12 dB in the mixer transconductance
stage. The two baseband active filter stages each provide 18 dB
of gain control range in 6 dB steps. Filter characteristics (ripple
and group delay) are best conserved if the active filter stages
have equal gain. This results in a total of 36 dB gain control in
4× 12 dB steps for the filter stage. The variable gain amplifier
(VGA) implements 24 dB of gain controllable in 1 dB steps. The
base gain of the mixer is 18 dB, and the base gain of the VGA is
6 dB. This gives a total of 102 dB gain with 90 dB of gain
control range.
The base gain of the mixer stage is 18 dB in WCDMA mode
and 27 dB in GSM mode.
Table 6. Receive Gain Control in WCDMA mode
Stage
Gain Control
Control Steps
LNA
0 dB to +18 dB
3 × 6 dB steps
Mixer
+18 dB to +30 dB (WCDMA)
+27 dB to +39 dB (GSM)
2 × 6 dB steps
Filter
0 dB to +36 dB
3 × 12 dB steps
VGA
6 dB to +18 dB
24 × 1 dB steps
To simplify programming and to ensure optimum receiver
performance and dynamic range, the user simply programs the
total desired receive gain in dB via the rx_gain[6:0] bits in
Register 11. The ADF4602 then decodes the gain setting and
automatically distributes the gain between the various blocks. To
allow some flexibility, predefined user inputs control the gain
threshold points at which the LNA and mixer gain steps occur.
Bit settings mixstep[3:0] and lnastep[3:0] control the mixer and
LNA gain threshold steps, respectively. An Excel spreadsheet
detailing the receive gain decode system is available from
Analog Devices, Inc., on request. Figure 45 shows an example
gain distribution profile.
120
110
100
90
80
70
60
50
40
30
20
10
0
–10
0
10
20
30
40
50
60
70
80
90 100 110 120
REQUESTED Rx GAIN (dB)
BL
O
C
K
G
A
IN
(
d
B)
07
09
2-
03
7
RF GAIN
BASEBAND GAIN
CHIP GAIN
MIXSTEP = 10
LNASTEP = 6
GAINCAL = 8
Figure 45. Gain Distribution Between RF and Baseband Blocks for Default
Setting
50
45
40
35
30
25
20
15
10
5
0
–5
–10
0
10
20
30
40
50
60
70
80
90 100 110 120
REQUESTED Rx GAIN (dB)
BL
O
C
K
G
A
IN
(
d
B)
07
09
2-
03
8
LNA GAIN
MIXER GAIN
FILTER GAIN
VGA GAIN
MIXSTEP = 10
LNASTEP = 6
GAINCAL = 8
Figure 46. More Detailed Gain Distribution Profile
In addition, a gain calibration setting in Register 15 (gaincal[4:0]) is
used to account for losses in the RF front end.
The total gain in the ADF4602 is given by
ReceiveGain = rxgain[6:0] gaincal[4:0] + X
(2)
where X = 8 in WCDMA filter mode, and X = 17 in GSM filter
mode. Rxgain[6:0] is the receive gain programmed in Register
11. Gaincal[4:0] is the gain calibration setting in Register 15,
and is calculated using the following formula:
gaincal[4:0] = 8 front_end_losses
(3)
where front_end_losses is the loss in the receive path due to
duplexers/switches. This is useful for referencing the
programmed gain to the antenna and accounting for any losses
in the path.
For example, if the total receive front-end loss is 2 dB, the user
should program gaincal[4:0] to 6 dB. If the user then requestes
80 dB of gain by programming rxgain[6:0] to 80 dB, the
ADF4602 uses Equation 4 to give
ReceiveGain = 80 6 + 8 = 82 dB
(4)
82 dB is the receive gain used internally by the ADF4602.
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