Category: Analog Electronics

In the following sections, we shall take a look at the departures from the ideal op-amp parameters that are found in practical devices, and survey the trade-offs—including cost and availability, as well as technical factors—that have to be made in real designs. Some instances of anomalous behavior will also be examined. But first we will…

As well as their application as a general-purpose amplifying device, operational amplifiers have a number of other uses, including voltage followers, differentiators, integrators, comparators, and summing amplifiers. We shall conclude this section by taking a brief look at each of these applications. 11.9.1 Voltage Followers A voltage follower using an operational amplifier is shown in Figure…

shows the circuit of an inverting amplifier with negative feedback applied. For the sake of our explanation we will assume that the operational amplifier is “ideal.” Now consider what happens when a small positive input voltage is applied. This voltage (VIN) produces a current (IIN) flowing in the input resistor R1. Figure 11.6 Operational amplifier with negative…

It is important to note that, since the product of gain and bandwidth is a constant for any particular operational amplifier. Hence, an increase in gain can only be achieved at the expense of bandwidth, and vice versa. Figure 11.5 shows the relationship between voltage gain and bandwidth for a typical operational amplifier (note that the…

shows abbreviated data for some common types of integrated circuit operational amplifier together with some typical applications. Table 11.2 Some common examples of integrated circuit operation Example 11.5 Which of the operational amplifiers in the table would be most suitable for each of the following applications? (a) amplifying the low-level output from a piezoelectric vibration sensor,…

In the following sections, we shall take a look at the departures from the ideal op-amp parameters that are found in practical devices, and survey the trade-offs—including cost and availability, as well as technical factors—that have to be made in real designs. Some instances of anomalous behavior will also be examined. But first we will…

As well as their application as a general-purpose amplifying device, operational amplifiers have a number of other uses, including voltage followers, differentiators, integrators, comparators, and summing amplifiers. We shall conclude this section by taking a brief look at each of these applications. 11.9.1 Voltage Followers A voltage follower using an operational amplifier is shown in Figure…

The three basic configurations for operational voltage amplifiers, together with the expressions for their voltage gain, are shown in Figure 11.7. Supply rails have been omitted from these diagrams for clarity but are assumed to be symmetrical about 0 V. Figure 11.7 The three basic configurations for operational voltage amplifiers. (a) Inverting amplifier; (b) Non-inverting amplifier; (c) Differential…

shows the circuit of an inverting amplifier with negative feedback applied. For the sake of our explanation we will assume that the operational amplifier is “ideal.” Now consider what happens when a small positive input voltage is applied. This voltage (VIN) produces a current (IIN) flowing in the input resistor R1. Figure 11.6 Operational amplifier with negative…