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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)： | 11/36頁 |
| 文件大?。?/td> | 477K |
| 代理商： | SA1630 |
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Philips Semiconductors
Application note
AN2003
SA1630 IF transceiver demonstration board
1999 Jan 05
11
Tx RMS output current, carrier suppression and
sideband suppression measurements
Figure 11 shows the set-up necessary for obtaining Tx parameter
measurements. The 1 MHz input tones need to be supplied from two
signal generators that have their time references locked to each
other to obtain the needed quadrature phase adjustment. The
magnitude of these input signals need to be identical and the phase
should be calibrated to as close to perfect quadrature as possible.
The clock reference is again supplied by an external signal generator
at 22 MHz, –10 dBm. The transmit output spectrum is viewed at the
TXout port with a spectrum analyzer. To obtain carrier suppression,
it is important to connect a DC voltage approximately equal to V
CC
/2
to pin 1 of the 8-pin header connector as shown in Figure 11. This
provides the proper DC bias to the Tx input pins through the secondary
center-tap of the balun transformers. The amplitude of the input
signals should be adjusted to provide a 1V
p-p
input level at the Tx
input pins. The measurement of this signal is made easily by
connecting to the secondary terminals of the balun transformer.
These signals are the C1 and C2 traces shown in Figure 12. Trace
M1 is the 1V
p-p
differential signal generated by mathematically
subtracting trace C2 from trace C1. Typically, to obtain the 1V
p-p
signal requires an output power of approximately –7.7 dBm from the
signal generator.
Figures 13, 14, and 15 show the LO suppression, sideband
suppression, and third harmonic distortion, respectively. The LO
suppression is measured relative to the magnitude of the
unsuppressed sideband, and should be 30 dBc or greater. The
sideband suppression is also measured relative to the
unsuppressed sideband and should be 35 dBc or greater. The third
harmonic distortion product should be more than 45 dBc from the
unsuppressed sideband.
The tx rms output current is simply calculated from the power
measurement from equation (3).
For example, Figure 13 shows the measured output power at the
port to be approximately –17 dBm. If we add 0.5 dB for losses
through the balun transformer, we then get –16.5 dBm. Inserting this
value in the equation yields a Tx rms output current of approximately
437
μ
A.
I
rms
10
Pout
10
*
1mW
load presented to the Tx pins
approx.117
(3)
DC CURRENT
METER
DC VOLT METER
POWER SUPPLY
+3V
32.3/41.5 mA DC
3.000000000 VDC
POWER
SWITCHES
1: ON
2–10: OFF = 3V
1.0000 MHz
–7.7 dBm
MARCONI 2026
MULTIPLE SIGNAL GENERATOR
1 MHz @ –7.7 dBm
22.0000 MHz
–10.00 dBm
R/S SME03 SIGNAL GENERATOR
22 MHz @ –10 dBm
SR01875
HP SPECTRUM
ANALYZER 8563E
POWER
+1.5 V
Figure 11. Tx measurement set-up
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