16nm bulk cmos docccii based configurable analog

IJRET: International Journal of Research in Engineering and Technology eISSN: 2319-1163 | pISSN: 2321-7308
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Volume: 03 Special Issue: 10 | NCCOTII 2014 | Jun-2014, Available @ http://www.ijret.org 124
16nm BULK CMOS DOCCCII BASED CONFIGURABLE ANALOG
BLOCK DESIGN FOR FIELD PROGRAMMABLE ANALOG ARRAY
Sadia Shireen1, Mohd.Faseehuddin2
1M.Tech Student, Electronics & Communication Dept., Integral University, Lucknow, India
2M.Tech Student, Electronics & Communication Dept., Integral University, Lucknow, India
Abstract
Field programmable analog array (FPAA) is a rapidly growing technology for fast prototyping of analog signal processing
systems facilitating the quick innovation at industry level with saving in terms of both time and cost. Analog signal processing is
much faster and consumes less power than conventional digital signal processing, justifying the need for FPAA. Here we propose
a Dual output current controlled current conveyor (DOCCCII) in 16nm bulk CMOS technology using PTM (High Performance
16nm Metal Gate / High-K / Strained-Si parameter) and discuss its characteristic. DOCCCII is superior in design among Current
Conveyors because it requires no additional resistance for activation, it has it’s own parasitic resistance tunable through biasing
current and has high bandwidth (GHz range). A configurable analog block (CAB) is also proposed which mainly consists of the
DOCCCII readily configurable to realize an application. This cab is used here for the realization of 2
nd
order filters.
Keywords— FPAA, Configurable Analog Block, DOCCCII, Electronically Tunable Circuit Design
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1. INTRODUCTION
Recently, the demand for FPAA’s is increasing because it
facilitates rapid prototyping and saves design time, design
efforts, testing time and cost. It provides a platform for new
innovation in analog domain, as complex circuits can be
implemented on FPAA in short time by the end user.
Substantial work on FPAA based on current mode has been
reported in many important publications [1-5]. This work
can be considered significant on the basis of various design
matrices like high frequency [3,4], low power and low
voltage [5] etc. Among different current mode circuits it is
clear that current conveyor (CC) plays an important role in
analog designing such as signal processing , instrumentation
[6-8], and is a versatile building block for the present day
scenario of low voltage low power VLSI [6,9,10]. A CC
offers both low impedance input and high impedance input
nodes simultaneously along with a voltage virtual short
among the various input nodes like a conventional OPAMP
[9, 10]. It exhibits improved slew rate [11,12], very high
gain bandwidth product [13-14], larger dynamic range,
greater linearity, small chip area, low power consumption
[10,15] and Current controlled current conveyor (CCC) is
another version, which exhibits a considerable resistance at
the low impedance or current input (node X). It is reported
that a CCC is more flexible [16] basically analog but
extendible to digital applications [17-19]. Applications like
passive comparator, regenerative comparator [19] ,D flip
flop [17], XOR/XNOR [18], CMOS clock generator etc. can
be seen in literature. A practical CC is deviation from ideal
behavior, known as non-idealities [16, 20]. Some of these
non-idealities play important roles, e.g. the parasitic
resistance at the low impedance node (R
X
) leads to define a
CCC. Likewise, other non-idealities also sometimes exhibit
similar favorable effects [20]. Current negation and current
duplication is very easy to obtain in case of a CCC, leading
to DOCCC, MOCCC etc. 2
nd
generation is generally
preferred, therefore CCCII, DOCCCII etc. are readily seen
in literature. Here in this paper we design two configurable
analog blocks (CAB) using the translinear DOCCCII,
realized in 16nm bulk CMOS Technology using the PTM
[21] CMOS model parameters.
Fig 1- Block diagram representation of the dual output
CCCII
Here,
2. CIRCUIT DISCRIPTION OF DOCCCII
CCCII has parasitic resistance RX at the current input node
and is tunable by the biasing current IB [15,20]. A
DOCCCII can provide an output current signal and it’s
quadrature signal simultaneously. The equivalent circuit
symbol and the principle equation of DOCCCII are given in
Figure 1.

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The CMOS implementation of a class AB DOCCCII is
presented in Figure 2. The circuit consists of a translinear
loop consisting transistors M1 – M4. Two MOS current
mirrors ( M5 – M6 and M7 – M8) are used to bias the
translinear loop with bias current I
B,
the input cell presents a
high input impedance at input port Y and a low input
impedance at input port X. This cell acts as voltage follower.
The current at node X is copied to output nodes Z+ and Z–.
Currents Id18 and Id14 are cross-coupled through transistors
M14, M15, M18 and M19 to generate negative current at Z-node.
Details are shown in circuit below.
Fig 2- Implementation of translinear DOCCCII
3. DOCCCII BASED CAB
A CAB is a block which can realize an application
configurable in user domain. In the present work a pair of
CAB’s is proposed which can accommodate a larger
application spectrum, particularly, the quadratic or bi-quadratic
applications, including various analog filters and
sinusoidal oscillators.
The CAB-1 contains a DOCCII, a capacitor at node Z+, and
NMOS switch S1.
The CAB-2 contains a DOCCCII, a conjoin of capacitor and
resistor at node Y, a capacitor at node Z- and X and switches
S2 – S8. These CAB’s are presented in Figure 3 and 4. In
order to include the required capacitors and resistor
respective NMOS switches associated with them are closed
to configure the CAB’s for a given application. A number of
these CAB’s can be used to construct FPAA and connected
together through the switching matrix to realize variety of
different applications.
Fig 3- CAB 1
Fig 4- CAB 2
The switch is no more ideal, but is a jargon of large number
of non-idealities like offset voltages and currents and
various parasitic resistances, inductance and a large number
of capacitances. Some of them are important in
consideration with FPAA scheme as their effects are
dominant. Therefore consideration is that their effects do not
alter the circuit performance altogether. Here in this work
we try to swamp the switch dominance over the application.
For this purpose, an estimate is made for the total effect of
various capacitances connected to a node and is assumed as
a lumped model of the total capacitance at the node (e.g.
C
GTOTAL
), also suggested by HSPICE. Besides this, channel
resistance is also considered in our model. This model is
affected by adjusting the external capacitance values and the
switch aspect.
4. SIMULATION RESULTS
The performance of the DOCCCII and the CAB’s based on
it are verified by performing H-spice simulations. The
utilized aspect ratios of the DOCCCII are given in TABLE
II and the simulation results are summarized in TABLE I.
AC analysis and bandwidth plot in Figure 5.

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Fig 5: AC analysis for node Z+ at IX=1uA.
The working of the proposed models is demonstrated by
running an application with the original circuit on as it is
basis and then the same application is realized by using the
CAB’s which are shown in Figure 3 and 4.
The applications realized include second-order low-pass,
band-pass and notch pass filters from the already published
work. The results show the waveforms are given in Figure
7(a), 7(b) and 9 and the results are summarized in TABLE
III. In Figure 6(a) a filter structure given in [22] is realized
using the designed CAB-2 respective switches are closed
namely (S2,S3,S5,S6,S7). In figure 8(a) a current mode
filter structure given [12] is realized using both the CAB’s
and the required components are included by closing
switches (S3,S6,S8). In simulation results shown in Figure
7(a), 7(b) and 9 the first waveform shows response of filters
realized without CAB and the second waveform shows
response of filters realized using CAB. The two CAB’s will
be connected by interconnect matrix on the FPAA not
shown here.
Fig 6 (a) & 6(b) - realization of filter using CAB and
without CAB
Fig 7(a) - Simulation response of notch pass filter using
figure 6(a) and figure 6(b)

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Fig 7(b) - simulation response of band pass filter using
figure 6(a) and figure 6(b)
Fig 8(a) & 8(b) - realization of filter using CAB’s and
without CAB’s
Fig 9-Simulation response of low pass filter using 8(a) and
8(b)
5. CONCLUSIONS
A new design for configurable analog block based on
DOCCCII for high frequency applications is proposed.
Using these CAB together with programmable interconnect
FPAA can be constructed which will efficiently realise a
number of 2
nd
order filter topologies, oscillators and
amplifiers.
REFERENCES
[1]. X.Quan,S.Embabi,and E.Sanchez-Sinencio, ”A current-mode
based field programmable analog array architecture
for signal processing applications,”in proc.IEEE Custom
Integr. Circuits Conf.,May 1998,pp.277-280.
[2]. G.Kapur, S.Mittal, C.M.Markan, V.P.Pyara, “To
develop a design methodology for a Analog Field

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Programmable CMOS Current Conveyor”, proceedings of IEEE student conference SCES 2012, MNNIT, Allahabad, 16th -18th March, 2012. [3]. S. H. K. Embabi, X. Quan, N. Oki, A. MANJREKAR AND E. Sa’nchez-Sinencio, A Cuurent -Mode Based Field Programmable Analog Array for Signal Processing Applications, Analog Integrated Circuits and Signal Processing,Vol17,Issue 1-2,pp 125-142 .1998 [4]. Vincent C.Gaudet. Glenn Gulak “ CMOS Implementation of a Current Conveyor-Based Field- Programmable Analog Array”, 1058-6393/98 IEEE. [5]. Soliman Mahmoud,Eman Soliman, “Novel CCII-based Field Programmable Analog Array and its Application to a Sixth- Order Butterworth LPF. Journal of Circuits, Systems and Computers” Journal of Circuits,Systems and Computers, volume20,Issue 08,December 2011. [6]. S. Sedra, G. W. Roberts, and F. Gohh, “The current conveyor: History, progress and new results,” Processing. Institute. Elect. Eng. Part G, vol. 137, no. 2, pp. 78–87, Apr. 1990. [7]. R. Senani, “Novel circuit implementation of current conveyors using an OA and an OTA,” Electron. Lett. , vol. 16, no. 1, pp. 2–3, January 1980. [8]. B. Wilson, “Recent developments in current conveyors and current mode circuits,” IEE Processing, Pt. G, vol. 137, pp. 63-77, April 1990. [9]. C. Toumazou, A. Payne, D. Haigh. “Analogue IC design: The current mode approach”, Peter Peregrinus 1990. [10]. Giuseppe Ferri and Nicola .C.Guerrinni, “Low voltage low power CMOS current conveyors”, Print ©2003 Kluwer academic publishers, Dordrecht [11]. B. Wilson. “Constant bandwidth amplification using current conveyors”. International Journal of Electronics, no. 65, pp. 893-898, 1988. [12]. Zia Abbas, Giuseppe Scotti and Mauro Olivieri, “Current controlled current conveyor (CCCII) and application using 65nm technology”, World Academy of Science, Engineering and Technology 55, 2011 [13]. C.H. Lee, J. Cornish, K. McClellan, J. Choma Jr., “Current-Mode Approach for Wide-Gain Bandwidth Product Architecture”, IEEE Trans. Cir. Sys. II, Vol. 45, May 1998. [14]. L.N. Alves, R.L. Aguiar, “A Differential Current- Conveyor Based Buffer for High-Bandwidth Low-Signal Applications”, ICECS99, Paphos, Cyprus, Sep. [15]. A.Fabre, O. Saaid, F. Wiest, and C. Baucheron, High frequency applications based on a new current controlled conveyor, IEEE Transactions. Circuits System-I, vol. 43,no. 2, pp. 82-90, 1996F. Yuan, CMOS Current-Mode Circuits for DATA Communications, Springer Verlag, 2007. [16]. M.Y.Yasin, Bal Gopal “High Frequency Oscillator Design Using a Single 45 nm CMOS Current Controlled Current Conveyor (CCCII+) with Minimum Passive Components” Circuits and Systems,2011,2,53-59, doi:10.4236/cs.2011.22009 [17]. M.Y.YASIN. “A Novel bipolar XOR/XNOR realization using translinear type 2nd generation current controlled current conveyor designed in 45 nm CMOS technology”,Actaelectrotechnicha,vol.54, no.1, pp. 3-6, 2013;
[18]. Firdaus Majeed. “Low voltage low power redesign of CCCII in 45 nm CMOS technology and its analog and digital applications” M.Tech thesis , May 2011,selected 3rd by IAS-IEEE;IEEE industry applications magazine,vol.17, no.6,pp.74, ISSN 1077-2618,Nov-Dec 2011
[19]. Firdaus Majeed, M.Y.Yasin, “A novel voltage comparator and its application-A new simple configuration based on 45 nm 2nd generation CMOS current controlled current conveyor”, Mediamira Science publisher,vol.53, no.2,2012. [20]. Pipat Prommee,Montri sondunyakanok, “ CMOS based current controlled DDCC and its applications to capacitance multiplier and universal filter” Int.J.Commun.(AEU) 65 pp.1-8, 2011. [21]. Predictive Technology Model, 2006 http://ptm.asu.edu. [22]. Jai Prakash,Pradep Kumar,“Voltage Mode Second Order BiquadraticFilters Using Single CCCII” international Journal of Electronics Engineering, vol. 3,pp. 257-260, 2011.

16nm bulk cmos docccii based configurable analog

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