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參數(shù)資料
| 型號： | GJRF400 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | SINGLE CHIP RF TRANSCEIVER |
| 中文描述： | 單芯片射頻收發(fā)器 |
| 文件頁數(shù)： | 4/8頁 |
| 文件大?。?/td> | 117K |
| 代理商： | GJRF400 |
98-05
Gran Jansen Oslo Norway
4
Power Amplifier
Figure 4: Power Amplifier
The amplifier is a class A amplifier, which is linearized by
the effective high-frequency
contributed by the bond wire inductance. The last stage
has an open collector, and an external load is therefore
necessary. The dc current in the amplifier is adjusted
with an external bias resistor. The ratio of the output
current (the current flowing in the load and output
transistor) to the current in the bias resistor is about 28.
The maximum output current is about 15 mA, which
gives a maximum bias current of 535uA. A 2.7k
bias
resistor will give approximately this bias current. The
components between the antenna and the output of the
power amplifier are for impedance matching. The
impedance matching circuit will depend on the type of
antenna used.
The power amplifier is turned on internally after the
control word is clocked into the shift register. This
changes the VCO load and influences the PLL. The PA
should be switched on and off externally by the
microcontroller to prevent spurious components from
being transmitted before the PLL stabilises.
emitter
degeneration
Low noise amplifier (LNA)
Figure 5: Low noise amplifier
A low noise amplifier in RF receivers is used to boost the
incoming signal prior to the frequency conversion
process. This is important in order to prevent mixer noise
from dominating the overall front-end noise performance.
The LNA is a two stage amplifier and has a nominal gain
of 20dB at 433.92MHz. The LNA has a dc feedback
loop which provides bias for the LNA. An external
capacitor decouples and stabilises the overall dc feedback
loop which has a large low frequency loop gain. The
components between the antenna and the input of the
LNA are for impedance matching. The input impedance,
measured at 435MHz, is
Z
j
IN
=
(
)
51
45
.
IF amplifier (VGA)
Table 2: Gain setting
A2
0
0
0
0
1
1
1
1
A1
0
0
1
1
0
0
1
1
A0
0
1
0
1
0
1
0
1
Gain (dB)
45
40
30
20
10
0
-10
-20
There is one variable gain amplifier in each channel of
the receiver. This amplifier is a two stage amplifier with
gain from -20dB up to 45dB. Pins A2, A1 and A0 control
the gain of the amplifier. The amplifier needs an external
capacitor connected between the emitters of the first
differential stage to eliminate the effect of offset on the
output of the mixers (between pin 36 and 37 , and
between pin 38 and 39). Gain is a function of A2, A1 and
A0, values are given in table 2.
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