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參數(shù)資料
| 型號： | RF137 |
| 英文描述： | Transceiver For GSM Applications |
| 中文描述： | 收發(fā)器的GSM應(yīng)用 |
| 文件頁數(shù)： | 7/15頁 |
| 文件大小： | 114K |
| 代理商： | RF137 |
Transceiver
RF137
100777C
Conexant - Proprietary
Data Subject to Change
7
October 11, 2000
Table 3. RF137 Electrical Specifications (4 of 4)
(T
A
= 25
°
C, Vcc = 3.0 V, except where specified)
Parameter
Symbol
Test Condition
Mn
Typical
Max
Units
Transceiver
Enable and control VIH
VIH
Vcc–0.4
V
Enable and control VIL
VIL
0.4
V
Enable and control IIH
IIH
20
60
μ
A
Enable and control IIL
IIL
–10
–1
0
μ
A
Total supply current:
Rx mode
Tx mode
Synthesizer mode
Sleep mode @Vcc = 3.0V
I
CC
RXENA = SXENA = high
TXENA = SXENA = high
SXENA = high
RXENA = SXENA =
TXENA = low
48
60
27
0.04
0.2
mA
mA
mA
mA
Power supply range
V
CC
(Note 5)
V
CCB
2.7
2.7
3.75
3.75
3.94
3.94
V
V
Operating temperature range
T
A
–30
+25
+85
°
C
Note 1
: For 1Vp-p, 100 kHz differential signals across Iin and Qin.
Note 2
: For 1 MHz loop bandwidth and external VCO with phase noise of –165 dBc/Hz @ 20 MHz offset froma carrier frequency of 900 MHz.
Note 3
: “NX spurs” denotes the order of the fLO harmonic that can mx with a harmonic of fIF and result in a product at zero frequency.
Note 4
: Using varactors with simlar characteristics as Loral part KV1925.
Note 5
: V
CC
must not be less than V
CCB
– 0.4 V if separate supply voltages are used for V
CC
and V
CCB
.
The buffer amplifier following the image reject mxer has an
output impedance of 330
for direct connection to the external
ceramc filter.
The second IF amplifier converts the single-ended output from
the ceramc filter to a differential signal which may be input to a
bandpass sigma-delta A/D converter. The input impedance of
the amplifier is a nomnal 330
, which matches the external
ceramc filter. The nomnal gain of the amplifier is 18 dB, but is
reduced to 6 dB when bit S8 = 0 (Rx Gain Sel2) and CO = 1.
Transmit Section
. The transmt section consists of the following
functional blocks:
A baseband to IF quadrature modulator with an output
amplifier.
A translation loop circuit consisting of a phase and
frequency detector, a charge pump, a TxRF input buffer, an
LO input buffer, a mxer, and a low pass filter.
The I/Q-to-IF modulator takes in differential I and Q baseband
signals. The baseband signals are initially low pass filtered and
then input to a pair of double balanced mxers. Pins 13 and 14
(TXMO+ and TXMO–, respectively), the modulator output, and
Pins 6 and 7 (TXIF+ and TXIF–, respectively), the IF input, allow
for any additional filtering required before the signals enter the
translation loop.
The translation loop circuit of the RF137, together with a VCO
and an external loop filter, forms a Phase-Locked Loop (PLL).
The inherent bandpass filtering that occurs in the PLL elimnates
the need for a duplexer or a Surface Acoustic Wave (SAW) filter
that is usually required to suppress transmssion noise. The
overall efficiency is increased as a result of the elimnation of
high loss, post-PA bandpass filters. This results in increased
handset talk time.
The VCO output of the translation loop is at the transmt RF
frequency. A portion of the VCO output must be fed back to Pin
47 (TXRFIN+) of the device and mxed with a buffered LO signal
to create an IF signal. The IF output fromthe mxer is input to
the phase and frequency detector where the IF output fromthe
mxer is compared with the modulated IF input to the device.
When CO = 1, the S6 bit on the three-wire bus allows for a high
side/low side injection setting.
Synthesizer Section (Sx)
. The synthesizer section consists of
the following functional blocks:
Frequency synthesizers
On-chip oscillator with external resonant circuit
Three-wire bus control circuit
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