**Op Multiplier Circuit**

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The complicated electronic circuit comprising of a large number of electronic components, on a single chip is called an Integrated Circuit. The operational Such ICs alongwith opamps are used to obtain variety of electronic circuits, now a days. In this context, it gives The Chapter 4 explains the basic multiplier circuit, its characteristics and performance parameters alongwith the concept of the operational transconductance amplifier and transconductance multiplier. It also includes where k is a constant determined by the circuit configuration. Substitution of this latter equation into the preceding equation gives us a form that reveals the multiplier action of the multiplier circuit. Here we can see that the output voltage is clearly.a result of multiplying the input voltages together with a circuit constant. The value of the constant (k) is typically 0.1. Since each of the input voltages may take on either of two polarities, this leads to four possible modes of operation. These four A Source Book of Practical Circuits Anthony Peyton, Vincent Walsh. Note that the bandwidth of the multiplier is proportional to the magnitude of Vxl — Vx2. Note also that Vxl — Vx2 must be positive to ensure that the overall feedback around the multiplier is negative. You can appreciate, now, that this combination of op amp output, multiplier core and differential input stage is very flexible. This type of multiplier is very widely used due to its properties of wide bandwidth,.good linearity, If a 30 V single supply is used instead of a 10 V supply the opamps can be operated at + 15 V. Thus the circuit affords a lowcost method of deriving bipolar power supplies for an opamp using a single power supply. In general multiplier. The ICL8013 is a fourquadrant analog multiplier whose output is proportional to the algebraic product of two input signals. Feedback around an internal opamp provides level shifting and can be used to generate division and squareroot functions.Meant for the undergraduate students of electrical and electronics engineering this text on Linear Integrated Circuits and Op Amps covers the entire syllabus of the subject.Basic circuit 64 Typical 1C OP AMPs 65 Basic Linear circuits using.OP AMP 72 OP AMP applications 78 Wave generation and shaping circuits using OP AMP 87 3.2 Monolithic RFIF amplifiers 93 RFIF amplifier circuit 93 RFIF amplifier 3.5 Analog multipliers 775 Variable transconductance multiplier 773 Logantilog multiplier 774 Timedivision multiplier 775 Variable conductance multiplier 775 CHAPTER 4 Building Blocks of Digital Systems 117 4.1 Basic digital circuits 777 Special Multiplier Integrator RMS Square rooting Fig. 10.10 RMS detector circuit The circuit has a multiplier as a squaring device as its first element. This gives square of the input, the opamp AI is an integrator which gives the integration of squared input. Finally opamp A2 along with the multiplier in its feedback loop performs square.rooting operation, on the output of opamp AI . Thus the final output is the RMS value of the input applied. 10.5.7 Rectifier using Multiplier "ino. A full wave rectifier + − + − 1 v i i 1 i 3 which is considered to be the opamp equation. Note that the diagram in Figure 6.32 is a simple symbol for an opamp, which typically contains many resistors, inductors, and capacitors built on an integrated chip. Example 6.8: An OpAmp Multiplier Consider the opamp circuit shown in Figure 6.33, in which one resistor R2 is in parallel connection with an opamp, and the resulting parallel circuit is in series connection with another resistor R1. Determine the relation Similarly, the proposed multiplierdivider by Kaewdang, Fongsamut.& Surakampontorn (2003), uses three active devices (OTAs). Yuce, E (2008) proposed a multiplier that uses one bipolar CCCII+ but requires current matching in order for the circuit to work as a multiplier. Moreover, the circuit is temperature sensitive. Also Khachab & Ismail (1989) and Khachab (1991) proposed multiplier / divider circuits that employ one opamp but needs to satisfy a condition for stability of the circuit.A diagram of an op amp with feedback and input elements with impedances T(s) is shown in Fig. 25. An approximate relation is Eo(s) Ei(s) = − Tf(s) Ti(s) The various control modes can be obtained by proper selection of the impedances. A proportional controller can be constructed with a multiplier, which uses.two resistors, as shown in Fig. 26. An inverter is a multiplier circuit with R f = Ri. It is sometimes needed because of the sign reversal property of the op amp. The multiplier circuit