Instrumentation amplifiers

In this experiment, you will become familiar with an instrumentation amplifier circuit that is used to amplify weak sensor output signals. [Pg.171]

Obtain the sensor amplifier module board from your instructor, and examine it closely as follows. Notice the outlined horizontal box in the top center of the board—it is labeled instrumentation amplifier. Notice the symbol of an amplifier in this box (refer to Figure 6.10). Also, notice the inputs to the amplifier (labeled P14 and P15). These are sockets for the wires that will bring the input signals to the amplifier. It is the difference between these two signals that is amplified. The output of the amplifier (the amplified signal) is connected to sockets P19 and P20. Wires inserted into these sockets allow us to observe the amplified signal with a voltmeter. [Pg.171]

Since the instrumentation amplifier is a difference amplifier, it amplifies the difference between the inputs at P14 and P15 by a factor set by the operator. This factor is set at the switch box labeled SW1. Notice that the amplification factor can be X5, XlO, X50, or X100. There are four switches, one for each of the factors. If all the switches are set to the left (off), then the amplification factor is Xl. When checking out each amplification factor, set all switches to off except for the factor being tested. [Pg.173]

What is the difference between an instrumentation amplifier and an operational amplifier ... [Pg.176]

R.J. van de Plassche, A Wide-Band Monohthic Instrumentation Amplifier , IEEE Journal of Solid-State Circuits 10 (1975), 424-431. [Pg.120]

The instrumentation amplifier is a high-performance differential amplifier consisting of a number of closed-loop op-amps. An ideal instrumentation amplifier gives an output voltage which is proportional only to the difference between two input voltages and Vtl, viz. ... [Pg.536]

J.R. Riskin, A User s Guide to IC Instrumentation Amplifiers , Analog Devices 1984, Norwood, Massachusetts, 1984,... [Pg.176]

Instrumentation amplifier is different from other types of amplifiers in that the signal from each side of the transducer bridge is amplified separately and then the difference between the two amplified signals is, in turn, amplified. As a result, noise from both sides of the sensors is reduced. [Pg.3687]

This example shows an analog solution with a V/I converter. Another possibility is an instrumental amplifier instead of the V/I converter. The analog evaluation circuit is economical relating to wafer-area, but there are a lot of design features necessary for a high accurate signal evaluation. All circuit blocks must be designed to be insensitive to temperature and mechanical stress. [Pg.263]

FIGURE 5-4 An instrumentation amplifier lor reducing the effects of noise common to both inputs. The gain of Ihe circuit is controlled by resistors H /a and KR. ... [Pg.114]

Instrumentation amplifiers arc composed of three op amps configured as shown in Figure 5-4. Op amp zl and op amp B make up Ihe input stage of Ihe instrumentation amplifier in which the two up amps are cross-coupled through three resistors R, R./u, and R. The second stage of the module is the difference amplifier of op amp C. The overall gain of the circuit is given by ... [Pg.114]

FIGURE 7-38 Thermocouple and instrumentation amplifier. The output voltage i is proportional to Ihe thermocouple voltage. Tbe magnitude of v is determined by the gain resistor R, which performs the same function as R Ju in Figure 5-4. [Pg.201]

Song, S., et al., 2013. A low-power noise scalable instrumentation amplifier for fetal monitoring applications. In 2013 IEEE International Symposium on Circuits and Systems (ISCAS2013), pp. 1926—1929. Available at http //ieeexplore.ieee.org/lpdocs/epic03/ wrapper.htm amumber=6572244. [Pg.268]

FIGURE 9.4 Circuit drawings for three different realizations of instrumentation amplifiers for biomedical applications. (a) Voltage follower input stage, (b) improved, amplifying input stage, and (c) 2-op-amp version. [Pg.140]

FIGURE 9.5 AC-coupled instrumentation amplifier designs. The classical design using an RC high-pass filter at the inputs (a) and a high CMRR quasi-high-pass amplifier as proposed by C.C. Lu (b). [Pg.141]

FIGURE 9.6 Composite instrumentation amplifier based on an AC-coupled first stage. The second stage is based on a one op-amp differential amplifier that can be replaced by an instrumentation amplifier. [Pg.142]

Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...