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VMMK-3803 датащи(PDF) 7 Page - Broadcom Corporation.

номер детали VMMK-3803
подробное описание детали  3 - 11 GHz UWB Low Noise Amplifier in SMT Package
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производитель  BOARDCOM [Broadcom Corporation.]
домашняя страница  http://www.broadcom.com
Logo BOARDCOM - Broadcom Corporation.

VMMK-3803 датащи(HTML) 7 Page - Broadcom Corporation.

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Figure 15. Biasing the VMMK-3803
Figure 13. Demo Board (available to qualified customers upon request)
VMMK-3803 Applications Information
Figure 14. Example demonstration circuit of VMMK-3803 for broadband
operation (3GHz to 11GHz).
Amp
Input
Vdd
Output
100 pF
6.8 nH
Vpd
0.1
µF
0.1
µF
100 pF
10 K
100 pF
Output
Pad
Ground
Pad
Input
Pad
50 Ohm line
50 Ohm line
Biasing and Operation
TheVMMK-3803 is biased with a positive supply connected
to the output pinVd through an external user supplied bias
decoupling network. Typical bias is 3 V at 20 mA. The “on”
state also requires that the input port of the VMMK-3803
also be biased at 3 V for normal gain operation. 0V on the
input puts the VMMK-3803 in the “off” state.
An example of simple user supplied bias tees is shown in
Figure 13. The output bias decoupling network feeding
Vdd consists of a shunt 6.8 nH inductor. At the input, a 10
Kohm resistor is needed to feed the power-down control
voltage. The input and output dc blocking capacitors are
each 100 pF. The “on” and “off” S Parameters shown in the
preceding tables reflect the operation of the circuit shown
in Figure 14.
Table 3. VMMK-3803 Demo Board BOM
Component
Value
DUT
VMMK-3803
C1
100 pF
C2
100 pF
R1
10 kohm
C5
0.1
μF
C6
100 pF
L1
6.8 nH
The input and output bias decoupling network can be
easily constructed using small surface mount compo-
nents. The value of the shunt inductors can have a major
effect on both low and high frequency operation. The
demo board uses small value inductors that have self
resonant frequencies higher than the maximum desired
frequency of operation. If the self-resonant frequency of
the inductor is too close to the operating band, the value
of the inductor will need to be adjusted so that the self-
resonant frequency is significantly higher than the highest
frequency of operation.
Typically a passive component company like Murata does
not specify S parameters at frequencies higher than 5 or
6 GHz for larger values of inductance making it difficult
to properly simulate amplifier performance at higher fre-
quencies. It has been observed that the Murata LQW15AN
series of 0402 inductors actually works quite well above
their normally specified frequency.
The parallel combination of the 100 pF and 0.1
μF bypass
capacitors provide a low impedance in the band of
operation and at lower frequencies and should be placed
as close as possible to the inductor. The low frequency
bypass provides good rejection of power supply noise
and also provides a low impedance termination for
third order low frequency mixing products that will be
generated when multiple in-band signals are injected into
any amplifier.
A layout of a typical demo board is shown in Figure 15.


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