參數(shù)資料
型號: SA1630
廠商: NXP Semiconductors N.V.
英文描述: IF Quadrature Transceiver(IF正交收發(fā)器)
中文描述: 中頻正交收發(fā)器(中頻正交收發(fā)器)
文件頁數(shù): 15/36頁
文件大?。?/td> 477K
代理商: SA1630
Philips Semiconductors
Application note
AN2003
SA1630 IF transceiver demonstration board
1999 Jan 05
15
Tx noise floor measurement
Figure 17 shows the necessary set-up for taking Tx noise floor
measurements. Notice the LNA between the Tx output port and the
spectrum analyzer. The Tx noise floor of the SA1630 is
approximately the same as that of a typical spectrum analyzer. So,
to reduce the noise of the measurement system, an LNA is used to
effectively reduce the noise contribution of the wideband mixer in the
spectrum analyzer. Figure 18 shows the measured gain of the LNA
to be 22.3 dB, and Figure 19 shows the measured noise floor to be
–134.7 dBm/Hz. (Be careful not to take the measurement away from
any spurs that may be generated by the PCB board or the spectrum
analyzer itself.) So the Tx noise floor is
–134.7 – 22.3 = –157 dBm/Hz
which is 1 dB better than the –156 dBm/Hz specification.
31.00000000 ADC
DC CURRENT
METER
DC VOLT METER
POWER SUPPLY
+3V
3.00000000 VDC
POWER
SUPPLY
SWITCHES
1: ON
2–10: OFF = 3V
22.0000 MHz
–10.00 dBm
R/S SME03 SIGNAL GENERATOR
22 MHz @ –10 dBm
SR01885
HP SPECTRUM
ANALYZER 8563E
IN
OUT
V
CC
LNA
Figure 17. Tx noise floor measurement set-up
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