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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： | 5/20页 |
| 文件大小： | 526K |
| 代理商： | W9009 |
Lucent Technologies Inc.
13
Data Sheet
September 1999
Cordless Telephony—Version 2.0
W9009 RF Transceiver for 900 MHz
Testing and Application of the W9009 (continued)
Transmit Upconverter
The W9009’s image reject transmit upconverter takes as input a signal modulated on a 10.7 MHz intermediate fre-
quency (IF) carrier and translates it to the 900 MHz band. An FM or FSK (constant envelope) IF signal at 160 mVp-p
(single ended) amplitude will give a 1 mW (nominal into 50
) RF output.
When a conventional upconverter mixes an IF signal with a local oscillator, two signals are generated: one copy of the
IF signal above the LO frequency, known as the upper sideband, and one copy below the LO frequency, known as the
lower sideband. These signals are spaced above and below the LO by the value of the IF carrier. In the case of the
W9009, the 10.7 MHz IF and a 915 MHz LO generates sidebands at 925.7 MHz and 903.3 MHz. One sideband is
chosen as the desired sideband or signal, and the other is known as the undesired sideband or image and must be
suppressed (not transmitted). In systems where a high IF is used, the undesired sideband is far enough in frequency
away from the desired sideband and can be easily removed by a filter.
In the W9009, the image is too close to the desired signal to be filtered out. What the image reject upconverter does
is perform two upconversions in parallel, with the undesired sidebands out of phase relative to each other. The sig-
nals are added together and the undesired sidebands cancel. This is accomplished by generating quadrature compo-
nents of both the IF and the LO; that is, generating not just cos(IF) and cos(LO), but also sin(IF) and sin(LO). One
mixer takes cos(IF) and cos(LO) as inputs and generates [ cos(LSB) + cos(USB)]. When the lower sideband is
selected through the control bits, the other mixer takes sin(IF) and sin(LO) and generates [ cos(LSB) – cos (USB) ].
Taking the sum of the outputs reinforces the LSB signal and cancels the USB signal. Alternately, if the upper side-
band is selected, the second mixer takes sin(IF) and –sin(LO) and generates [ –cos(LSB) + cos(USB) ], and the sum
of the outputs reinforces the USB signal and cancels the LSB signal.
5-7992
Figure 5. Transmit Upconverter Test Circuit
Figure 5 shows the external connections to the transmit upconverter. The TXIN and TXIP pins are inputs to a differen-
tial amplifier with an internal differential impedance of 7200
– j2800 at 10.7 MHz. The external resistor R2 is used
to set the input impedance. When applying a single-ended signal, C4 is used to bypass one input to ground, typically
with a value of 0.01
F. The input is internally biased, so C3 (1000 pF typical) provides a dc block. For characteriza-
tion purposes, when driving the input with a 50
signal generator, R2 is set to 50 . In the application where the
TXIF signal is filtered with a 10.7 MHz ceramic filter which also blocks dc, R2 is set to 330
and C3 may be elimi-
nated.
The transmitter output stage is an open collector cascode amplifier. An off-chip impedance matching network made
up of C1, R1, and L1 is required to transform the 50
system impedance to the proper load for power transfer out of
the amplifier. L1 also provides bias to the open collector output. This stage is grounded through the PAGND pin, so a
minimum length trace to ground is critical. R1 is used to broaden the impedance match and improve out-of-band sta-
bility, with a 1 k
value. C1 and L1 are 1.5 pF and 8.2 nH, with C2 a 100 pF bypass on VCC.
C2
L1
R1
C1
TX RF
OUT
PAGND
RFOUT
RFGND
C3
TXIF
C4
R2
TXIN
TXIP
VCC
1
2
3
32
31
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