ZAMP003
TEST CIRCUIT LAYOUT
Note: For ZAMP003, L1 and C5 are not fitted.
APPLICATION NOTES
The ZAMP003 is a medium power wideband amplifier
which is designed for low power applications. The
ZAMP003 provides both a 50 Ohm input and output
impedance and thus requires no additional matching
components. The input and output signal connections
each require a DC blocking capacitor (C1 and C2). A
suitable value for these capacitors is around 100pF for the
950MHz to 2150MHz frequency range. For other
frequency ranges the value of the capacitor should be such
that its reactance at the lowest operating frequency is small
when compared to 50 ohms. Supply de-coupling is also
recommended and should take the form of a suitable
100pF capacitor, C3, for the 950MHz to 2150MHz
frequency range. The 100pF capacitor should be mounted
as close to the Vcc pin of the amplifier as is physically
possible. An additional low frequency de-coupling
capacitor, C4, with a value around 100nF (for the 950MHz
to 2150MHz range) is also advised.
An example layout for a test board for the series can be
seen above. This was designed for an FR4 board 1 x 1 inch,
0.016 inch thick with a copper thickness of 35 microns.
Edge mounted SMA connectors were used for the RF
signals. The inductor is not required for the ZAMP003.
PROVISIONAL ISSUE A - MARCH 2003
5
SEMICONDUCTORS
ZETEX [ ZETEX SEMICONDUCTORS ]
