Hardware Reference
In-Depth Information
a
b
y 1
DVCC
y 1
R 1
R 1
DVCC
z
R 2
R 2
z
I in
y 2
y 2
x
x
V in
I in
V in
C 0
C 0
Fig. 14.4 Realization of R-L immittances using a single DVCC proposed by Incekaraglu and
Cam (a) Simulation of series R-L impedance (b) Simulation of parallel R-L impedance (Adapted
from [ 14 ] © 2005 Springer
The CMOS DVCC from [ 9 ] was used for SPICE verifications of the circuits of
Fig. 14.4 using model parameters fromMIETEC 0.5
μ
m CMOS process and DVCC
biased with
2.5 V supply. The circuits were used to design simple second order
filters. The filter characteristics obtained from SPICE simulations exhibited good
agreement with theory.
Another grounded positive and negative parallel R-L immittance simulator
circuit was by Yuce [ 17 ] is shown here in Fig. 14.5 . An analysis of this circuit
gives the following admittance:
I in
V in ¼
1
R 1 þ
1
R 2
1
sCR 1 R 2
Y in ¼
ð
14
:
6
Þ
Thus, the circuit simulates positive or negative parallel R-L impedance. In the
equation ( 14.6 ), plus sign implies the use of a DVCC + while negative sign implies
a DVCC-.
14.6 Electronically-Controllable Gyrator and Grounded
Inductor Using DXCCII
The dual-X CCII (DXCCII) essentially combines the significant features of both
CCII and ICCII and has been shown to be particularly interesting building block
from the view point of MOSFET-C filter design. The dual-X nature of the
X-terminals facilitates easy cancellation of the square non-linearity of the
MOSFETs because if the drain and source of the MOSFET are connected between
two X-terminals, the imposition of complementary signals on the drain and source
terminals of the MOSFET ensures the cancellation of the square nonlinearity. In
view of this, it therefore, looks feasible that this basic idea may also be useful in
realizing MOSFET-based gyrator and simulated inductors. This was first
Search WWH ::




Custom Search