Author

# B. B. Bhattacharyya

Bio: B. B. Bhattacharyya is an academic researcher from Concordia University. The author has contributed to research in topics: Capacitor & Crystal oven. The author has an hindex of 4, co-authored 6 publications receiving 44 citations.

##### Papers

More filters

••

TL;DR: In this article, a set of tunable RC oscillators, each using two finite gain voltage controlled voltage sources, three resistors and two grounded capacitors, are presented for testing the structures for latch up behavior.

Abstract: A systematic procedure is given to generate a set of tunable RC oscillators, each using two finite gain voltage controlled voltage sources, three resistors and two grounded capacitors. These realizations are shown to be minimal with respect to passive and active elements under the constraint that (one end of) all the capacitors remain grounded. The set consists of four oscillators and is shown to be complete, that is, no additional oscillator circuit can be generated under the given assumptions. A simple approach is then introduced for testing the structures for latch up behaviour. This approach also suggests a way of redesigning the oscillator circuits to render them free of latch up problems, if they exist. Experimental results are found to be in good agreement with the theory.

15 citations

••

TL;DR: In this article, the authors proposed an optimal RC active filter configuration that minimizes the worst-case deviation in both the pole-Q(Qp) and the pole frequency ωp and also guarantees that the network is free from unstable modes of operation during activation.

Abstract: It is desirable, from the point of view of integration, to have all the capacitors grounded in RC active filters. Recently, such a network was reported with only a preliminary design procedure. An optimal design is presented in this paper for the above network. The new design leads to a simpler configuration, simultaneously minimizes the worst-case deviation in both the pole-Q(Qp) and the pole frequency ωp and also guarantees that the network is free from unstable modes of operation during activation. Although this design is based on Qp and ωp, it is also suitable for notch and allpass sections. It is shown that the gains of the operational amplifiers (o.a.s.), controlling the poles of the filter, can all be made equal to (4Q2p-1)1/3; this choice of the gains minimizes the effect of the finite bandwidths of the amplifiers on Qp and ωp. A simple scheme is proposed to compensate for this effect. The effect of compensation on the zeros, in the case of notch and allpass sections, is also studied. It is found that the effect on the notch frequency is negligible, while, for allpass filters, compensation for the poles automatically provides compensation for the zeros. A simple tuning scheme using only resistors is also presented, and the theoretical results are verified experimentally.

15 citations

••

TL;DR: In this article, a simple technique for precisely controlling the amplitude of oscillators is described, where the control parameter is a voltage and the relationship between this voltage and amplitude is linear.

Abstract: A simple technique for precisely controlling the amplitude of oscillators is described. The control parameter is a voltage and the relationship between this voltage and the amplitude of oscillation is linear. Two applications of the scheme, namely, in amplitude stabilization of oscillators and in generation of stabilized amplitude modulated signals, are discussed. Experimental results agree closely with the expected performances. The scheme is versatile and suitable for mass production.

8 citations

••

TL;DR: In this paper, a systematic approach to the design of stray-insensitive switched-capacitor (SC) circuits from active-RC or RLC prototypes employing a parasitic insensitive SC differential voltage-controlled current-source as a basic building block is attempted.

Abstract: A systematic approach to the design of stray-insensitive switched-capacitor (SC) circuits from active-RC or RLC prototypes employing a parasitic insensitive SC differential voltage-controlled current-source as a basic building block is attempted. Procedures for transforming active-RC and RLC circuits into stray-insensitive SC circuits are formulated and illustrated with typical examples. Restrictions on the pole-frequency and pole-Q of the SC biquad are derived so that it closely emulates the frequency response of the original active-RC biquad. the SC biquad and the ladder filter derived by the proposed procedures were simulated with discrete components and tested in the laboratory. Test results agree closely with the theoretical predictions.

4 citations

••

TL;DR: In this article, the second-order open-circuit voltage transfer functions by single-amplifier active RC networks are discussed, based on polynomial decompositions having the property that the sensitivity of ω0 with respect to the amplifier gain is zero.

Abstract: This paper discusses realizations of second-order open-circuit voltage transfer functions by single-amplifier active RC networks. These realizations are based on the polynomial decompositions having the property that the sensitivity of ω0 with respect to the amplifier gain is zero. In addition, the gain-sensitivity product of Q is minimized and the element spread is contained to be within acceptable limits. The realizations are suitable for hybrid IC technology.

3 citations

##### Cited by

More filters

••

TL;DR: In this paper, a new configuration for realizing a currentmode oscillator using single positive current-follower was presented, and the feasibility of obtaining a quadrature oscillator was investigated.

Abstract: A new configuration for realizing a current-mode oscillator using single positive current-follower is presented. The circuit uses three grounded capacitors and three resistors. The feasibility of obtaining a quadrature oscillator is investigated. >

76 citations

••

TL;DR: In this article, a general, unified and systematic approach is employed to study realization of operational amplifier (OA) based sinusoidal RC-active oscillators, both single frequency and variable frequency operations are investigated.

Abstract: A general, unified and systematic approach is employed to study realization of operational amplifier (OA) based sinusoidal RC-active oscillators. Both single frequency and variable frequency operations are investigated. A set of circuits is found for each case. The sets consist of 12 and 16 circuits respectively. The circuits are canonic, that is, they require the minimum number of active and passive components. For each circuit, the single frequency set requires one OA, two capacitors and four resistors, while the variable frequency set needs one OA, two capacitors and five resistors. Both sets are shown to be complete in that generation of any additional canonic circuit is not possible. Variable frequency oscillators are all single resistor controlled. They are classified into four groups according to the nature of their dependence on the variable resistor. All the circuits are laboratory tested. Experimental results agree closely with the theoretical analysis. Representative test results are included.

49 citations

••

Cairo University

^{1}TL;DR: In this article, a new approach in the systematic synthesis of current conveyor based active RC canonic oscillators is given, which is based on the generalized systematic synthesis framework using admittance matrix expansion.

Abstract: A new approach in the systematic synthesis of current conveyor based active RC canonic oscillators is given. The synthesis procedure is based on the generalized systematic synthesis framework using admittance matrix expansion. The resulting derived oscillators include many novel oscillators, using various types of current conveyors and inverting current conveyors. The oscillators considered in this paper uses the minimum number of passive elements namely two capacitors and three resistors necessary to have independent control on the condition of oscillation and on the frequency of oscillation. The generated oscillators employ two grounded capacitors and have the advantage of their ability to absorb parasitic element effects. Three classes are considered in this paper, class I oscillators have a common node between one of the capacitors and one of the two grounded resistors. Class II oscillators have a common node between one of the capacitors and the floating resistor. Class III has all three resistors being grounded and one of them shares a node with one of the capacitors. It should be noted that this is the first paper in the literature to use nodal admittance matrix expansion in the generation of current conveyor oscillators. Spice simulation results are included to support the theory. The proposed method can be generalized to other active devices.

41 citations

••

TL;DR: In this article, a realization of the quadrature sinusoidal oscillator with the employment of current differencing buffered amplifiers (CDBAs) as active components is proposed.

Abstract: Abstract – A realization of the quadrature sinusoidal oscillator with the employment of current differencing buffered amplifiers (CDBAs) as active components is proposed. The proposed oscillator circuit is composed of two CDBAs, three resistors, and three capacitors. Outputs of two sinusoidal with 90° phase difference are available from the configuration. The oscillation condition and the oscillation frequency (ωo) of the proposed oscillator can also be orthogonally tuned. Experimental and simulation results obtained using the commercial available AD844 ICs are given to confirm the theoretical analysis.

39 citations

••

Cairo University

^{1}TL;DR: In this paper, the nodal admittance matrix (NAM) of the single Op Amp Wien oscillator is taken as the starting point in the new approach of systematic synthesis of equivalent oscillators.

Abstract: This paper introduces a new generation method of the grounded capacitor Wien oscillator circuits using current conveyors (CCII) or inverting current conveyors (ICCII) or combination of both of them. The nodal admittance matrix (NAM) of the single Op Amp Wien oscillator is taken as the starting point in the new approach of systematic synthesis of equivalent oscillators. The synthesis procedure is based on the generalized systematic synthesis framework using NAM expansion. The resulting derived 32 oscillators include many novel oscillators, using current conveyors or inverting current conveyors or both. Comparison between the generated oscillators based on the effect of parasitic elements on the oscillator performance is discussed.

35 citations