Victor Taracila1, Aleksey Zemskov1,
Vijayanand Alagappan1, Fraser Robb1
1GE Healthcare, Aurora, OH, United
States
In
the well-known preamplifier decoupling technique, a low input impedance
preamplifier in series with an inductor attached to the matching capacitor is
utilized. One of the problem of this design is the inductors stray field and
preamplifiers ground disturbance. When using a balun in front of the
preamplifier, the transmission line from which the balun is composed creates
the needed inductance. Also, providing high impedance on the outer shield of
the balun, amplifier ground is kept unperturbed. In this work we present the
RF-invisible balun based on double spiral inductor shape and its PCB
implementation.