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Fig. 8.2 Modified high
frequency precision full
wave rectifier proposed by
Toumazou et al. [
3
]
D
2
Y
V
in
CCII
Z
A
X
D
1
V
B
V
out
R
1
R
2
D
4
X
Z
CCII
B
D
3
Y
a
V
out
D
2
V
in
D
3
Y
Y
Z
Z
X
R
L
X
D
4
D
1
A
R
1
b
A
R
I
Fig. 8.3 (a) Precision full wave reciter employing CCs (b) Current biasing technique proposed by
Hayatleh et al. [
4
]
with the additional draw back that any excess of the bias voltage will also add
directly to the DC offset voltage in the final output of the circuit. A better alternative
is to employ a current biasing technique as shown in Fig.
8.3b
. It has been
demonstrated that far better temperature stability can be achieved by biasing the
diode with a constant DC current source. Fig.
8.3a
is a CC-based precision full wave
rectifier from [
4
].
In [
5
], Stiurca demonstrated that the use of current mirror based biasing arrange-
ment to bias the rectifying diodes provides higher temperature stability than
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