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參數(shù)資料
| 型號(hào)： | MRFIC1807 |
| 廠商： | MOTOROLA INC |
| 元件分類： | 衰減器 |
| 英文描述： | PLCC32 |
| 中文描述： | 1500 MHz - 2200 MHz RF/MICROWAVE NARROW BAND MEDIUM POWER AMPLIFIER |
| 封裝： | PLASTIC, SOIC-16, 16 PIN |
| 文件頁數(shù)： | 7/8頁 |
| 文件大小： | 226K |
| 代理商： | MRFIC1807 |
7
MRFIC1807
MOTOROLA RF DEVICE DATA
DESIGN AND APPLICATIONS INFORMATION
DESIGN PHILOSOPHY
The MRFIC1807 is designed to operate with the MRFIC1806
Driver/Ramp IC in 1.9 GHz Personal Communication System
(PCS) applications such as Europe’s DECT and Japan’s PHS.
The design incorporates a depletion mode GaAs power MES-
FET with a high–power transmit/receive switch and
associated bias circuitry in one low–cost SOIC–16 package.
The power MESFET is sized to produce at least 27 dBm
saturated output power, including switch loss, from a 3.5 V
supply, but the output power can be controlled using the
PCNTRL input. This control voltage also allows setting of the
quiescent current of the FET. PCNTRL can be set to give
best efficiency or linearity for the particular system application.
The TX/RX control pin allows fast switching of the T/R switch
for TDMA applications. When switching from transmit to
receive, the battery supply voltage should be removed from
the PA (Pin 4), to avoid excessive current drain. This is usu-
ally accomplished using an external pass transistor con-
trolled by the TX/RX signal. Alternatively, if PCNTRL is
reduced to 0 V during RX mode, the bias current is reduced
to nearly zero.
The Transmit/Receive switch is a reflective MESFET
design which is optimized for low loss and power handling in
transmit mode. The design can handle 28 dBm of transmit
power without significant increase in insertion loss. A regu-
lated 3.0 Volt supply is required at pin 16 for the T/R switch
and the bias and control circuitry.
DECT APPLICATIONS
Figure 2 shows the component values for a DECT imple-
mentation of the MRFIC1807. For use in equipment designed
for DECT, the power amplifier is operated close to saturation
to improve device efficiency. Maximum power output at the
antenna connector is 24 dBm during a burst. The constant en-
velope characteristics of the GMSK modulation allow non–lin-
ear amplification without spectral regrowth. The transmit
signal must be shaped or “ramped” to meet system transmit
turn on time requirements of 10 sec minimum while not splat-
tering into adjacent channels. A turn on time on greater than
2.0 sec has been shown to give adequate adjacent channel
power performance. Most DECT realizations have the modu-
lation applied to the transmit VCO so the most straight for-
ward way of implementing this ramping function is at the
power amplifier. The MRFIC1806 Driver/Ramp IC has an
on–chip ramping circuit specifically designed for DECT.
When ramped in this manner, the MRFIC1806 will supply the
appropriately ramped RF signal to the MRFIC1807 which
only has to be turned on and off with TX/RX. Alternate off–
chip ramping can be implemented either with external com-
ponents or at baseband. Consult the MRFIC1806 datasheet
for more information.
PHS APPLICATIONS
For Japan’s Personal Handy System applications, the
modulation is /4 DQPSK. When amplified with a non–linear
amplifier, the signal will regrow the sidebands which have
been carefully filtered at baseband, resulting in adjacent
channel interference. To avoid this spectral regrowth, the
amplifier must be operated “backed off” from saturation. The
amount of backoff required has been shown to be a function
of amplifier saturated output capability and may be as high
as 5.0 dB. The PHS specification calls for a maximum aver-
age power during a burst to be 19 dBm. This is consistent
with 5.0 dB backoff from the DECT operating point so the
same DECT operating condition could be used. Alternatively,
PCNTRL can be adjusted for a lower bias point to improve
efficiency or higher bias for better linearity. With /4 DQPSK
modulation, ramping can be accomplished in the encoder so
no external ramp circuit is needed. See the MRFIC1806 data
sheet for further details.
EVALUATION BOARDS
Evaluation boards are available for RF Monolithic Inte-
grated Circuits by adding a “TF” suffix to the device type.
For a complete list of currently available boards and ones
in development for newly introduced product, please con-
tact your local Motorola Distributor or Sales Office.
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| MRFIC1808 | 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:1.9 GHz GaAs LOW NOISE AMPLIFIER |
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| MRFIC1814R2 | 制造商:Motorola 功能描述:MOTOROLA S8MXC |
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