参数资料
型号: AMMC-6408-W50
元件分类: 放大器
英文描述: 6000 MHz - 18000 MHz RF/MICROWAVE WIDE BAND MEDIUM POWER AMPLIFIER
封装: 2 X 2 MM, ROHS COMPLIANT, DIE-10
文件页数: 11/12页
文件大小: 276K
代理商: AMMC-6408-W50
8
Biasing and Operation
The recommended quiescent DC bias condition for
optimum eciency, performance, and reliability is Vdd=5
volts with Vg set for Idd=650 mA. Minor improvements in
performance are possible depending on the application.
The drain bias voltage range is 3 to 5V. A single DC gate
supply connected to Vg will bias all gain stages. Muting
can be accomplished by setting Vgg to the pinch-o
voltage Vp.
A simplied schematic for the AMMC6408 MMIC die is
shown in Figure 17. The MMIC die contains ESD and over
voltage protection diodes for Vg, Vd1, and Vd2 terminals.
In a nalized package form, Vd1 and Vd2 terminals are
commonly connected to the Vdd terminal. The bonding
diagram for the recommended assembly is shown in
Figure 18. ESD diodes protect all possible ESD or over
voltage damages between Vgg and ground, Vgg and Vdd,
Vdd and ground. Typical ESD diode current versus diode
voltage for 11-connected diodes in series is shown in
Figure 19. Under the recommended DC quiescent biasing
condition at Vds=5V, Ids=650mA, Vgg=-1V, typical gate
terminal current is approximately 0.3mA. If an active
biasing technique is selected for the AMMC6408 MMIC
PA DC biasing, the active biasing circuit must have more
than 10-times higher internal current that the gate
terminal current.
An optional output power detector network is also
provided.
A
typical
measured
detector
voltage
versus output power at 18GHz is shown Figure 20.
The dierential voltage between the Det-Ref and Det-Out
pads can be correlated with the RF power emerging from
the RF output port. The detected voltage is given by,
V = (Vref - Vdet) - Vofs
where Vref is the voltage at the DET_R port, Vdet is a
voltage at the DET_O port, Vofs and is the zero-input-
power oset voltage. There are three methods to
calculate Vofs:
1. Vofs can
be
measured
before
each
detector
measurement (by removing or switching o the
power source and measuring Vref - Vdet ). This method
gives an error due to temperature drift of less than
0.01dB/50°C.
2. Vofs can be measured at a single reference
temperature. The drift error will be less than 0.25dB.
3. Vofs can either be characterized over temperature and
stored in a lookup table, or it can be measured at two
temperatures and a linear t used to calculate Vofs at
any temperature. This method gives an error close to
the method #1.
The RF ports are AC coupled at the RF input to the rst
stage and the RF output of the nal stage. No ground
wires are needed since ground connections are made
with plated through-holes to the backside of the device.
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