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參數(shù)資料
| 型號(hào)： | RF9986 |
| 廠(chǎng)商： | RF MICRO DEVICES INC |
| 元件分類(lèi)： | 無(wú)繩電話(huà)/電話(huà) |
| 英文描述： | PCS LOW NOISE AMPLIFIER/MIXER |
| 中文描述： | TELECOM, CELLULAR, RF AND BASEBAND CIRCUIT, PDSO24 |
| 封裝： | SSOP-24 |
| 文件頁(yè)數(shù)： | 4/8頁(yè) |
| 文件大?。?/td> | 235K |
| 代理商： | RF9986 |
8-134
RF9986
Rev B1 010717
8
F
Application S chematic
Pin
20
Function
LNA OUT
Description
LNA output pin. This is an open-collector output. This pin is typically
connected to pin 22 through a bias/matching inductor. This inductor, in
conjunction with a series blocking/matching capacitor, forms a match-
ing network to the 50
image filter and provides bias (see Application
Schematic). The LNA’s IP3 may be increased 10dB by connecting pin
20 to V
CC
through the inductor. The LNA’s current then increases by
10mA. Other in-between IP3 vs. I
CC
trade-offs may be made by con-
necting resistance values between V
CC
and the matching inductor. The
two reference points for consideration are with 150
used, which is
what connection to pin 22 achieves, the Input IP3 is +5.5dBm and the
LNA I
CC
is 5mA. Using no resistance, the Input IP3 is +15.5 dBm and
the LNA I
CC
is 15 mA. Desired operating points in between these val-
ues may be interpolated, roughly.
Same as pin 17.
Interface Schematic
21
22
GND8
VCC4
Output supply voltage for the LNA output (pin 20). This pin is typically
connected to pin 20 through a bias/matching inductor (see application
schematic). External RF bypassing is required. The trace length
between the pin and the bypass capacitor should be minimized. The
ground side of the bypass capacitor should connect immediately to
ground plane.
Same as pin 17.
See pin 2.
23
24
GND9
NC
No connection. This pin may be grounded (recommended) or left open.
LNA
OUT
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
V
CC
22 pF
LO BUFF EN
(On:
≥
3.1 V;
Off:
≤
0.5 V)
LO IN
V
CC
22 pF
2.7 nH
1.8 pF
RF Image
Filter, 50
22 pF
V
CC
C2
Filter
IF-
IF+
1 nF
C1
L1
22 pF
C1
L1
1 nF
V
CC
LO BUFF OUT
Z
FILTER
= 1 k
Z
OUT
= 1 k
Measurement
Reference Plane
L1 and C2 serve dual purposes. L1 serves as an output bias choke, and C2 serves as a series DC block. In addition, the
values of L1 and C2 may be chosen to form an impedance matching network if the IF filter's input impedance is not 1000
.
Otherwise, the values of L1 and C1 are chosen to form a parallel-resonant tank circut at the IF when the IF filter's input
impedance is 1000
.
RF IN
22 pF
C2
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