, of the noninverting averaging
circuit shown in Fig. P4.33.
(Figure P4.33, page
159)
, of the noninverting averaging
circuit shown in Fig. P4.33.
and
.
and 
to combine
the two equations and eliminate the 
and
terms.
.
of the noninverting averaging
circuit shown in Fig. P4.33a.
, we write node equations at the
op-amp's input
terminals. The node equation at the noninverting
terminal is
.
.
, we combine the two equations
to eliminate the 
and 
terms,
.
in terms of 
, 
and 
,
.