Nikolay N. Prokopenko

Basic concept of linear synthesis of multi-valued digital structures in linear spaces

Non-classical approach to logical synthesis of multi-valued elements (ME) of computer equipment, based on principles of linear algebra, is considered. Ideology and basic principles of ME building, which are non-similar to traditional one are described.

The differential and differential difference operational amplifiers of sensor systems based on bipolar-field technological process AGAMC

The architectures of the operational amplifiers (OA), implemented on the basis on bipolar and field (JFET) transistors, are offered. Their feature — the use of transistors operating on different physical principles, precision in the input circuits of differential stages (DS). This allows you to set a static DS mode due to the choice of the geometric dimensions of field-effect transistors and to exclude from structure of the classical sources of the reference current. The circuit engineering and the basic circuits of inclusion of the differential difference operational amplifiers (DDA), based on the analog gate-array master chip AGAMC (OJSC Integral, Minsk) with low offset voltages, are provided. Parameters and topology of the experimental chip of OA of this class (IC-3) oriented on use in the sensor systems of responsible application are given.

The radiation-hardened instrumentation amplifier based on the differential difference operational amplifier for BiJFET technological process

The paper reviews the design outputs of the radiation-hardened instrumentation amplifier (IA) based on the differential difference operational amplifier (DDOA) with low common-mode gain (GCM). The small values of GCM are provided by the introduction of the negative feedback on the inphase signal (IS) into DDOA. It is shown that, unlike the conventional circuits, IA of this subclass enables to minimize the effect of its resistive elements on GCM. The simulation results of the IA microcircuit, implemented on the components of the radiation-hardened analog gate-array master chip (AGAMC), are given. The applicability of the matrix array R-2R for the digital control by the differential gain (GD) of IA is shown.

The reconfigurable radiation-hardened differential difference operational amplifier and its main connection circuits in sensor systems

The article suggests an architecture of the reconfigurable differential difference operational amplifier (DDOA) which enables the possibility to change the main transfer ratios (0.5, 1, 1.5, 2, 3) in inverting and non-inverting inclusions without feedback resistors. This mode is provided by the switching of inputs or control of the steady-state behavior of three input voltage/current converters. The implementation of the prototype model of the DDOA microcircuit is based on the radiation-hardened BiJFET technological process which provides the operational performance of analog devices on its ground at the neutron flux up to Fn=10E14 n/cm2 and the accumulated radiation doze up to D=3 Mrad.

Microwave selective RC amplifiers with control parameters

The architecture features of selective amplifiers of microwave ranges are considered. The expediency of usage Gilberts current amplifiers is shown. The examples of a circuit design are given and conclusions of application importance are formulated. The simulation results of designed selective amplifier are given.

The method of speeding of the operational amplifiers based on the folded cascode

The new architectures of the high-speed operational amplifier (op-amp) based on the complementary folded cascodes (FCs), which form the intermediate stage of op-amp, are suggested. In the folded cascode the circuit techniques, excluding the traditional limitations of its output current, which recharges the balancing capacitor of op-amp, are provided. It increases the maximum slew rate of op-amp (SR) by a factor of 4-5. It is recommended to use class AB differential amplifiers as an input stage of op-amp. When realizing the op-amp on the Zarlink process, the maximum slew rate is more than 20000 V/μs. Besides, other parameters of the transient (the stability, the oscillability, the maximum overshoot, the dependence of SR on the impulse input signal amplitude, etc.) dont worsen. The circuit of op-amps is realized within the classical technologies, including BiJ, BiFET, CMOS.

The linear concept of logical synthesis of digital IP-modules of control and communication systems

This paper describes a nonclassical approach to the logical synthesis and circuitry designing of digital IP-modules for computer facilities, control systems and communication. It is based on changing from Boolean algebra by another algebraic structure to the linear algebra. The process of the logical synthesis and circuitry designing of digital devices is described in the offered algebraic structure. The advantages of the considered architectural and circuitry solutions for the synthesis of double-valued and multi-valued digital nodes of different applications in comparison with the double-valued Boolean algebra are demonstrated.

SiGe Selective Amplifier of Microwave Range with High Asymptotic Attenuation

The circuit principle of construction of the low-speed selective amplifiers (SA) of microwave range on the energy-efficient converters voltage-current is developed. The proposed solution provides the possibility of cascade connection of several SA without additional loops of matching of the static mode. The principle of symmetry of the frequency-dependent feedback loop underlies in the circuit construction. The reviewed architecture of SA in contrast with the well-known ones reduces the asymptotic attenuation not only in the traditional high-frequency range but also in low-frequency one without a separating capacitor. This effect is achieved by using CMOS transistors in the input differential stage. The results of the mathematical analysis and simulation of SA on 0.25 um SiGe process are given. Shown the possibility of parametric optimization the sensitivity functions of quasi-resonance frequency and Q-factor SA instability parameters of passive elements.

Circuit Design of Classical Stages with Bandwidth Enhancement Technique

The circuit design features of classical stages (common-base (CB), common-emitter (CE)) and voltage follower with a capacitive load with bandwidth enhancement technique based on the effect of the mutual compensation of the parasitic impedances are considered. The technique is based on introduction of special circuits of active frequency correction, such as current and voltage followers. The advantage of such technique is limited by frequency range of these followers, which can be implemented on base of simple structure with high transition frequency. The mathematical conditions of bandwidth enhancement technique are also considered. Several wideband amplifiers based on proposed technique are shown. The simulation results show that bandwidth increased for 2.41 times without degradation of voltage gain in case of circuit on base of common-base stage, 2.1 times in case of differential circuit on base of common-emitter stage and 2.42 times in case of voltage followers circuit that based on common-collector circuit.

Basic linear elements of k-Valued digital structures

The nonclassical approach to a logic synthesis of k-valued digital structures is considered. It is based on replacing the classical body of mathematics of the logic synthesis (Boolean algebra) – linear algebra. The features of the circuit implementation of operations of linear algebra necessitate going from the potential signals to the current ones. In particular, the new approach is developed, using linear operations, to give forms to initial linear logic structures, from which any logic elements can be further built. The paper considers the circuitry of the corresponding current logic elements of k-valued logics, realized on the base of classical technologies for practical use in the analog-digital interfaces and sensor systems.