Hardware Reference
In-Depth Information
+V
Q
3
Q
4
Q
11
Q
12
Q
2
Q
9
Q
1
Q
10
I
p
i
y
I
n
Y
X
+
−
Z
i
z
= −i
x
I
n
i
x
I
p
Q
5
Q
6
Q
13
Q
14
Q
7
Q
8
Q
15
Q
16
−V
Fig. 2.12 Implementation of CCII
from an OMA- [
8
]
Fig. 2.13 A CCII
implementation using
op-amps and only NPN
transistors based on the
operational mirrored
amplifier proposed by
Huijsing and Veelenturf [
5
]
+V
Q
5
Q
6
−
Q
4
+
i
y
= 0
I
p
I
p
Y
+
Z
X
I
n
−
i
z
I
n
i
x
Q
1
Q
3
Q
2
−V
s CC implementation to
sense the current in the positive supply line is replaced by an elegant circuit using an
op-amp configured as a voltage follower (VF) and three NPN transistors, two of
which are diode-connected. With Q5 and Q6 matched, the VF ensures the same
In this circuit, the PNP mirror employed in the Wilson
'
Search WWH ::
Custom Search