ZAMP001
TEST CIRCUIT LAYOUT
Note: For ZAMP001, L1 and C5 are not fitted.
APPLICATION NOTES
The ZAMP001 is a wideband RFIC amplifier designed
for use primarily in DBS applications. The amplifier is
designed to provide 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 is also advised.
An example layout for a test board for the ZAMP 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
ZAMP001.
ISSUE 2 - MARCH 2003
SEMICONDUCTORS
6
ZETEX [ ZETEX SEMICONDUCTORS ]
