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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)： | 19/36頁 |
| 文件大小： | 477K |
| 代理商： | SA1630 |
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Philips Semiconductors
Application note
AN2003
SA1630 IF transceiver demonstration board
1999 Jan 05
19
Q: What power at the Tx input port do I need to supply to
ensure 1 V
p-p
at the input pins
A: The transmit I and Q input each have a shunt 50
resistor to
allow the voltage calculations to be made directly from the power
indicated on the signal generator. 1 V
p-p
= 353.33 mVrms is
required across the input pins. The balun transformer turns ratio
is 4:1. So, the required voltage across the resistor at the primary
of the balun is 353.33 mVrms/4 = 88.39 mVrms. The required
power from the signal generator is approximately:
PindBm
10log
353.33mVrms
4
* 1mW)
2
(50
0.5dB
insertion loss of transformer = –7.6 dBm
Q: How do I measure Irms output current
A: Irms output current is obtained from a power measurement at the
Tx output. It is calculated using the following equation:
I
rms
10
Pout
10
*
1mW
(load presented to the Tx pins
approx. 117 )
Q: What is the impedance transformation of the Tx input
balun
A: The impedance transformation is 16:1.
Q: What is the impedance transformation of the Tx output
balun
A: The impedance transformation is 4:1.
Other areas of concern
Q: Why is the supply current greater than that specified in the
datasheet
A: The common V
CC
connection supplies not only the SA1630, but
also supplies power to the on-board VCO and other circuitry.
Also, keep in mind that the supply current in Rx mode will be
higher if any of the gain control stages have been turned on.
Q: Why are there two Transmit operation modes
A: One transmit mode completely shuts down the Rx bias circuitry
to save power. The other transmit mode allows the Rx bias
circuitry to remain powered up to enable quick Tx to Rx
transitions by keeping the Rx output ac coupling capacitors
charged.
Q: How can I determine the insertion loss of a balun
transformer
A: The best method is to connect two baluns back to back. This
enables you to make a simple two port insertion loss
measurement using a spectrum analyzer or network analyzer.
Q: The specified Tx noise floor is below the noise floor of my
spectrum analyzer. How can I measure this parameter
A: This can be done by placing an additional low noise amplifier in
the measurement system between the Tx output of the SA1630
and the input to the spectrum analyzer. This effectively reduces
the noise floor of the measurement system, thus allowing the
measurement to be made.
Q: What data rates can be demodulated using this part
A: The data rate is dependent on the modulation scheme used.
With modulation schemes which deliver multiple bits/symbol, the
SA1630 can support data rates in excess of 11 Mbps.
Q: How do I evaluate the current consumption of an individual
circuit block of this IC
A: Sometimes systems do not require all of the functionality
provided by the SA1630 and evaluating the power consumption
of individual portions of the IC becomes important. All seven of
the V
CC
supply pins on the IC are ganged together and
connected to the common supply connection post through 0
resistors R33,34,35,36,37,38 and 39 on the backside of the
PCB. Each of these V
CC
supply pins are also connected to one
of the pins of the 8-pin header connector on the topside of the
PCB. To evaluate the current consumption of a particular circuit
block you simply remove the appropriate resistor on the backside
of the PCB and connect a separate power supply and current
meter to the associated 8-pin header pin on the topside of the
PCB. Table 2 summarizes the associated V
CC
supply pins, 8-pin
header pins and 0
resistors.
Table 2.
SUPPLY DESCRIPTION
IC PIN
8-PIN HEADER PIN
0
RESISTOR
Vbias TXIN
N/A
1
No resistor
V
CC
BB
V
CC
VGA24
V
CC
VGA
V
CC
CP
V
CC
TXRX
V
CC
VCO
V
CC
DIG
15
2
33
1
3
34
2
4
35
34
5
36
39
6
37
N/A
7
38
22
8
39
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