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参数资料
| 型号： | W9009 |
| 元件分类： | 无绳电话/电话 |
| 英文描述： | TELECOM, CORDLESS, BASEBAND CIRCUIT, PQFP32 |
| 封装： | TQFP-32 |
| 文件页数： | 6/20页 |
| 文件大小： | 526K |
| 代理商： | W9009 |
14
Lucent Technologies Inc.
Data Sheet
September 1999
Cordless Telephony—Version 2.0
W9009 RF Transceiver for 900 MHz
Testing and Application of the W9009 (continued)
Receive LNA and Downconverter
The W9009’s receive low noise amplifier (LNA) and image reject downconverter take as input the received RF sig-
nal from the antenna via the T/R switch and front end filter and downconvert it to the 10.7 MHz IF frequency. The
output of the downconverter is applied to a bandpass filter, which is followed by the IF amplifier and limiter. The
LNA and mixer provide 24 dB power gain from 50
input to 330 output with 4.2 dB noise figure in high gain
mode. The LNA has a low-gain mode that decreases gain by 12 dB, with a similar improvement in input compres-
sion point.
5-7993.r1
Figure 6. Receive Downconverter Test Circuit
Figure 6 shows the external connections required by the LNA and downconverter. The LNA input requires off-chip
components to provide a dc block and impedance matching for optimum noise figure. This is achieved using L1 and
C1 values of 12 nH and 100 pF. Bias to the LNA is provided through the LNAVCC pin, which requires an inductance
of 12 nH for L2 and resistance of 100
for R1. Bypass capacitors C3 and C4 are both 100 pF.
Some gain adjustment is possible by varying L2 and R1. Increasing either L2 or R1 will increase gain and decrease
the contribution of the downconverter to the system noise figure. The designer is cautioned that increasing gain by
this technique will adversely affect the receiver’s compression and third order intercept performance.
Bias is applied to the open collector MXOUT pin through the parallel connection of L3, R2, and C5. For test and
characterization, where a broad match is preferred, values of 6.8
H, 360 are used, with C5 not fitted, and
1000 pF for C7. This matches the output to 330
. Impedance matching to 50 is achieved by setting R3 to 280
and terminating into a 50
spectrum analyzer or other instrument. A correction of 8.1 dB (power) or 16.2 dB (volt-
age) is made to account for the loss of the resistor.
C3
VCC
L2
R1
L1
RFIN
LNAGND
LNAVCC
VCC
C4
C1
L3
R2
C5
C6
RF
RECEIVE
C7
R3
4
5
6
7
8
IF
OUT
RECEIVE
IN
MXOUT
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