- 您現在的位置：買賣IC網 > PDF目錄373886 > AD6122ARS (ANALOG DEVICES INC) CDMA 3 V Transmitter IF Subsystem with Integrated Voltage Regulator PDF資料下載
參數資料
| 型號： | AD6122ARS |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 通信及網絡 |
| 英文描述： | CDMA 3 V Transmitter IF Subsystem with Integrated Voltage Regulator |
| 中文描述： | SPECIALTY TELECOM CIRCUIT, PDSO28 |
| 封裝： | SSOP-28 |
| 文件頁數： | 14/20頁 |
| 文件大小： | 264K |
| 代理商： | AD6122ARS |
REV. B
AD6122
–
14
–
R2
R1
MODOPP
MODOPN
IFINP
IFINN
Z
IN
R1
RSHUNT >>R2
AD6122
Figure 28. Pad Topology
L
R
R
R
=
+
20
1
1
1
1
1
2 2
/
log
(3)
Z
R
IN
=
+
2R
2
(4)
where
L
is the transducer loss (or loss through the pad) in dB
and
Z
IN
is the desired input resistance in ohms. Using these
equations, we can design the attenuator circuit to provide what-
ever amount of attenuation we require.
I
Q
500mV p-p
DIFFERENTIAL
LO
MODULATORS
500mV p-p
DIFFERENTIAL
100mV p-p
DIFFERENTIAL
20dB
ATTENUATOR
VGAIN = 2.5V
GAIN = +34dB
TRANSMIT
OUTPUT
IF AMPLIFIERS
–
21dBm
(REFERRED TO 1k )
252.1mV p-p DIFFERENTIAL
–
41dBm
(REFERRED TO 1k )
25.21mV p-p
DIFFERENTIAL
IFIN
–
7dBm
(REFERRED TO 1k )
1.263V p-p DIFFERENTIAL
MODOP
Z
OUT
= 1k
1k
2
Z
IN
= 1k
VCC
Figure 29. Level Diagram
This circuit is very sensitive to parasitic capacitances. As a re-
sult, extra care should be taken to ensure minimum and equal
printed circuit board transmission lines. We should also try to
keep R2 small in order to minimize the effects of printed circuit
board parasitic capacitance on loading the output of the pad.
In conclusion, we have to develop a system-level ACPR budget
for our radio, and from that budget determine how much ACPR
performance we desire from the AD6122. We then need to imple-
ment the appropriate attenuation network to get that ACPR
performance.
LEVEL DIAGRAM
Figure 29 is provided to better understand the different voltage
levels you can expect to see at different points of the AD6122. It
represents the voltage and power levels expected for a maximum
input condition of 500 mV p-p at the I and Q modulator and
maximum gain in the IF amplifiers. When trying to make these
measurements, a high impedance (10 M
) active FET probe
(for example, the Tek P6204, from Tektronix) should be used to
minimize the effects of loading the circuit with the probe.
In order to produce these results, the attenuator is designed to
have a 1 k
input impedance and the output of the IF amplifiers
are loaded with 1 k
. The roofing filter is designed to resonate
the parasitic capacitance at the IF frequency.
相關PDF資料 |
PDF描述 |
|---|---|
| AD6122ACP | CAP 39000UF 35V ELECT THA SERIES |
| AD6122ACPRL | CDMA 3 V Transmitter IF Subsystem with Integrated Voltage Regulator |
| AD6122 | CDMA 3 V Receiver IF Subsystem with Integrated Voltage Regulator(低功耗接收中頻子系統(tǒng)) |
| AD6140ARSRL | Bandpass IF Subsystem |
| AD6140ARS | RE Series - Econoline Unregulated DC-DC Converters; Input Voltage (Vdc): 3.3V; Output Voltage (Vdc): 12V; Power: 1W; Industry Standard Pinout; 1kVDC & 2kVDC Isolation; UL94V-0 Package Material; Optional Continuous Short Circuit Protected; Fully Encapsulated; Custom Solutions Available; Efficiency to 85% |
相關代理商/技術參數 |
參數描述 |
|---|---|
| AD6122ARSRL | 制造商:AD 制造商全稱:Analog Devices 功能描述:CDMA 3 V Transmitter IF Subsystem with Integrated Voltage Regulator |
| AD612BS | 制造商:POP 功能描述: |
| AD6140 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Bandpass IF Subsystem |
| AD6140ARS | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| AD6140ARSRL | 制造商:Rochester Electronics LLC 功能描述:- Tape and Reel |
發(fā)布緊急采購，3分鐘左右您將得到回復。