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參數(shù)資料
| 型號： | RF105 |
| 英文描述： | 900 MHz Digital Spread Spectrum Transceiver |
| 中文描述： | 900兆赫數(shù)字?jǐn)U頻收發(fā)器 |
| 文件頁數(shù)： | 2/12頁 |
| 文件大?。?/td> | 119K |
| 代理商： | RF105 |
RF105
900 MHz Digital Spread Spectrum Transceiver
2
Conexant
W117, Rev. B
September 28, 1999
Conexant Proprietary Information
Technical Description
Baseband Filter Bandwidth _______________________
The receive baseband filters have a bandpass
characteristic. The low-pass cutoff is determined by the
GmC filters and is set by the R
gmc
resistor connected to pin
19.
The GmC filter has a 3-pole Butterworth response and is
preceded by a 4-pole Butterworth Sallen & Key low-pass
filter with a fixed cutoff frequency of 1.2 MHz. The fixed
filters are designed to attenuate out-of-band blocking
signals propagating through the receive path.
The baseband high-pass cutoff is set by the bandwidth of
the DC servo loop, which in turn is set by the value of the
C
servo
capacitors connected between pins 32 and 33, and
pins 34 and 35. The DC servo loop nulls out the DC offset
in the receive baseband path. It is designed to be tolerant
of the C
servo
Equivalent Series Resistance (ESR), so that
common surface mount capacitors are suitable.
The baseband high-pass cutoff frequency should be set
much lower than the low-pass cutoff frequency, or else the
servo loop will become unstable.
The optimum receive bandwidth values are:
f
LPF
= 820 kHz, R
gmc
= 875
f
HPF
= 20 kHz, C
servo
= 0.082
μ
F
RF Output _____________________________________
The transmit RF outputs from the RF105 are differential
and matched to 100
differential. If a single-ended
connection is required, the unused output must be suitably
terminated by a 50
resistor (see Figure 4). The transmit
output power is determined by the output power control
inputs, PS1 (pin 20) and PS2 (pin 21), and by the value of
R
mod
(connected to pin 14). R
mod
sets the bias current into
the modulator, which is then multiplied by a factor set by
the state of PS1 and PS2. PS1 and PS2 input
programming is described in the Transmitter section of
Table 3.
The characteristic of the output Peak Envelope Power
(PEP) versus R
mod
is shown in Figure 3 for a sinusoidal
120 mV peak-to-peak input signal and for high power
mode (PS1 = 0, PS2 = 0). For R
mod
equal to 1.2 k
, the
typical RF105 output power is approximately –8 dBm in
high-power mode. This provides approximately 20 dBm of
transmit power when used with Conexant’s RF106 (29 dB
gain PA).
-12
-11
-10
-9
-8
-7
-6
-5
-4
Tx PEP (dBm)
R
0.5
0.6
0.7
0.8
0.9
1
1.1
1.2
1.3
1.4
1.5
1.6
1.7
1.8
1.9
2
2.1
2.2
2.3
Figure 3. Tx PEP vs Rmod
(Txd signal = 120 mVpp, 300 kHz sinusoid, Vcc = 3.0V)
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