RF2045 データシートの表示（PDF） - RF Micro Devices
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RF2045 Datasheet PDF : 6 Pages
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Preliminary
RF2045
Pin Function Description
Interface Schematic
1
RF IN
RF input pin. This pin is NOT internally DC blocked. A DC blocking
capacitor, suitable for the frequency of operation, should be used in
most applications. DC coupling of the input is not allowed, because this
will override the internal feedback loop and cause temperature instabil-
ity.
2
GND
Ground connection. Keep traces physically short and connect immedi-
ately to ground plane for best performance.
3
RF OUT RF output and bias pin. Biasing is accomplished with an external series
resistor and choke inductor to VCC. The resistor is selected to set the
DC current into this pin to a desired level. The resistor value is deter-
mined by the following equation:
RF OUT
R = (---V----S--U----P---P----L---Y----–----V----D----E---V---I--C----E---)
RF IN
ICC
4
Care should also be taken in the resistor selection to ensure that the
current into the part never exceeds 120mA over the planned oper-
ating temperature. This means that a resistor between the supply and
this pin is always required, even if a supply near 5.0V is available, to
provide DC feedback to prevent thermal runaway. Because DC is
present on this pin, a DC blocking capacitor, suitable for the frequency
of operation, should be used in most applications. The supply side of
the bias network should also be well bypassed.
4
GND
Same as pin 2.
Application Schematic
VCC
10 nF 22 pF
4
47 nH
22 pF
RF IN
1
RBIAS
3
RF OUT
22 pF
2
Rev A5 010110
4-15
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