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參數(shù)資料
| 型號(hào)： | TA0030 |
| 廠商： | RF Micro Devices, Inc. |
| 英文描述： | TRANSMIT AND RECEIVE AGC AMPLIFIERS FOR CDMA CELLULAR /PCS PHONES |
| 中文描述： | 發(fā)送和接收AGC放大器的CDMA蜂窩/ PCS電話 |
| 文件頁(yè)數(shù)： | 5/6頁(yè) |
| 文件大?。?/td> | 90K |
| 代理商： | TA0030 |
13-155
TA0030
13
T
A
Copyright 1997-2000 RF Micro Devices, Inc.
system designer only wishes to use the modulator/
AGC section. In the receive chain, a demodulator is
added to the receive AGC amplifier. In this case, the
output of the part is I/Q data at baseband frequencies.
The RF9957 CDMA Receive IC includes both of these
functions. Both the RF9957 and RF9958 operate from
a single 3V power supply.
The RF2607 and the RF2609 are two critical compo
nents of the RF section of a CDMA phone (see Figure
9). Both of these IC's were designed to meet all of IS-
95's worst-case requirements and are available in high
volume at low cost. Please call RF Micro Devices' Mar-
keting Department for additional information and
details on these two products, or any others, at 910-
664-1233. Also, please check our web page at
www.rfmd.com.
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
NC
GAIN
CONTROL
IN
SEL.
10 nF
R1:
1 k
CDMA-
FM IN
CDMA+
IF IN
SELECT
4.7 k
GC
10 nF
L1
L1
V
CC
C2
OUT+
OUT-
V
CC
R2:
500
C1
C1
C2
Measurement
Reference Plane
Z
LOAD
=500
FM IF Filter
CDMA IF Filter
Z
S
=500
Z
IN, EFF
=500
Z
IN
=1 k
Z
S
=850
Z
S, EFF
=333
Z
IN
=850
Measurement
Reference Plane
Z
LOAD,EFF
=250
Z
OUT
=500
R1 sets the CDMA balanced input impedance. The effective input
impedance is then 500
.
R2 sets the balanced output impedance to 500
. L1 and C2 serve dual
purposes. L1 serves as an output bias choke, and C2 serves as a series DC
block. In addition, the values of L1 and C2 may be chosen to form an
impedance matching network of the load impedance is not 500
.
Otherwise, the values of L1 and C1 are chosen to form a parallel-resonant
tank circuit at the IF when the load impedance is 500
.
10 nF
10 nF
Figure 8. RF2607 Application Circuit
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