资料介绍
COUPL1A
COUPL1A.doc
E.M.C. COUPLINGS
MAR 2004
COMMON IMPEDANCE COUPLING
Basic amplification line
Each amplifier stage
amplifies the voltage difference
between a hot line and the cold line
known as reference or ground
If a high current or fast signal circuit shares this ground it may
develop in it some parasitic
voltage which adds to the useful one , and spoils the complete
amplification line .
The ground lines must be as low impedance as possible , care must be taken
to separate noisy circuits from sensitive circuits at gound level .
Good ground planes are necessary .
CHASSIS