Hardware Reference
In-Depth Information
a
+V CC
I B
1
Q 1
Q 2
i z1
i z2
i zn
i y
+
+
+
i x
V x
i z1
i z2
i zn
Y
X
V y
Q 3
Q 4
I B
−V EE
b
i z1+
i z2+
i y
Z +
Y
V y
Z +
i zn+
i z1−
i z2−
Z +
MOCC
Z
Z
i x
i zn−
Z n
X
V x
Fig. 10.9 The MOCC ( a ) An examplary bipolar implementation ( b ) Symbolic notation
10.2.6 Multiple-Output Current Conveyor
Having a multiple output CCII (MOCC) with multitude of identical as well as
complementary outputs is particularly useful in current mode signal processing/
signal generation; see [ 12 - 16 ].
A MOCC can be realized from a bipolar or CMOS implementation of a CCII by
adding additional transistors and current mirrors. An exemplary bipolar MOCC is
shown in Fig. 10.9a , where the additional part creating multiple copies can be easily
identified. Its symbolic notation is shown in Fig. 10.9b from where a MOCC is
characterized by the following terminal equations: i y ¼
0, v x ¼
v y ,i z1+ ¼
i z2+ ¼
i z3+
¼ ...
¼
i zn+ ¼¼
+i x and i z1- ¼
i z2- ¼
i z3- ¼ ...
¼
i zn- ¼¼
i x .
MOCCs are particularly useful for realizing current mode universal biquad
filters and also in higher order ladder filter design based upon the simulation of
its node equations, for instance, see [ 13 , 14 ].
.
.
 
Search WWH ::




Custom Search