
11-1
11.1 Introduction
Radiofrequency (RF) and mechanical energy transducers generate an alternating (ac) voltage and cur-
rent
th
at
is pr
oportional
to th
e
av
ailable
po
wer
in th
e
en
vironment
. Th
ere
ar
e
ot
her
tr
ansducers
(o
f
di
erent
en
vironmental
en
ergies)
th
at
al
so
gen
erate
an ac si
gnal
. Ho
wever,
we ha
ve
ch
osen
th
ese
en
ergies
as th
e
mo
st
re
presentative
in te
rms
of th
e
va
riety
of en
ergy
co
nditioning
ci
rcuits
us
ed
. Ot
her
ac ha
rvesters
ca
n
us
e
si
milar
ci
rcuits
an
d
te
chniques
to th
at
pr
esented
in th
is
ch
apter
. In
deed,
RF an
d
mechanical energy sometimes benet of the same energy conditioning circuit structures. However,
no
te
th
at
ea
ch
tr
ansducer ...