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參數(shù)資料
| 型號： | MAX2422EAI |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 無繩電話/電話 |
| 英文描述： | Hex Buffers/Drivers With Open-Collector High-Voltage Outputs 14-SO 0 to 70 |
| 中文描述： | TELECOM, CELLULAR, RF AND BASEBAND CIRCUIT, PDSO28 |
| 封裝： | 5.30 MM, MO-150, SSOP-28 |
| 文件頁數(shù)： | 12/14頁 |
| 文件大?。?/td> | 250K |
| 代理商： | MAX2422EAI |
M
900MHz Image-Reject Transceivers
12
______________________________________________________________________________________
coupling of the varactor is a way to reduce the effects
of high-varactor tolerance and increase loaded Q. For a
wider tuning range use larger values for C2 and C3 or a
varactor with a large capacitance ratio. Capacitor C26
is used to trim the tank oscillator frequency. Larger val-
ues for C26 helps negate the effect of stray PCB
capacitance and parasitic inductor capacitance (L3).
Choose a low-tolerance capacitor for C26.
For applications that require a wide tuning range and
low phase noise, a series coupled resonant tank may
be required as shown in Figure 4. This tank uses the
package inductance in series with inductors L1, L2,
and capacitance of varactor D1 to set the net equiva-
lent inductance which resonates in parallel with the
internal oscillator capacitance. Inductors L1 and L2 can
be implemented as microstrip inductors, saving com-
ponent cost. Bias is provided to the tank port through
chokes L3 and L5. R1 and R3 should be chosen large
enough to de-Q the parasitic resonance due to L3 and
L5, but small enough to minimize the voltage drop
across them due to bias current. Values for R1 and R3
should be kept between 0 and 50
. Proper high-fre-
quency bypassing (C1) should be used for the bias
voltage to eliminate power supply noise from entering
the tank.
Oscillator-Tank PC Board Layout
The parasitic PC board capacitance, as well as PCB
trace inductance and package inductance, can affect
oscillation frequency, so be careful in laying out the PC
board for the oscillator tank. Keep the tank layout as
symmetrical, tightly packed, and close to the device as
possible to minimize LO feedthrough. When using a PC
board with a ground plane, a cut-out in the ground
plane (and any other planes) below the oscillator tank
reduces parasitic capacitance.
Using an External Oscillator
If an external 50
LO signal source is available, it can
be used as an input to the TANK or
TANK
pin in place
of the on-chip oscillator (Figure 3). The oscillator signal
is AC coupled into the TANK pin and has a level of
about 0dBm from a 50
source. For proper biasing of
the oscillator input stage, the TANK and
TANK
pins
must be pulled up to the V
CC
supply via 50
resistors.
If the application requires overdriving the internal oscil-
lator, the pull-up resistors can be increased in order to
save power. If a differential LO source such as the
MAX2620 is available, AC couple the inverting output
into
TANK
.
MAX2420
MAX2421
MAX2422
MAX2460
MAX2463
TANK
50
50
EXT LO
EXTERNAL LO LEVEL IS
0dBm FROM A 50
SOURCE.
V
CC
C
BLOCK
0.01
μ
F
V
CC
TANK
Figure 3. Using an External Local Oscillator
MAX2420
MAX2421
MAX2422
MAX2460
MAX2463
TANK
L1
L
T
L
T
L2
L3
L4
L5
R1
R2
R3
C
i
C1
C2
V
CC
V
TUNE
TANK
Figure 4. Series Coupled Resonant Tank for Wide Tuning Range and Low Phase Noise
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