PH4705/ET4305:Instrumentation Amp
... This modification improves the input impedance of our circuit. The sensor is now connected via “Unity Gain Buffer”, an Op Amp with its –ve input connected directly to its output. This configuration has gain of 1 and an input impedance ≥109Ω so presenting virtually no load to the sensor. Gain and CMR ...
... This modification improves the input impedance of our circuit. The sensor is now connected via “Unity Gain Buffer”, an Op Amp with its –ve input connected directly to its output. This configuration has gain of 1 and an input impedance ≥109Ω so presenting virtually no load to the sensor. Gain and CMR ...
No Slide Title
... After we know how to convert RLC components from time to phasor domain, we can transform a time domain circuit into a phasor/frequency domain circuit. Hence, we can apply the KCL laws and other theorems to directly set up phasor equations involving our target variable(s) for solving. Next we f ...
... After we know how to convert RLC components from time to phasor domain, we can transform a time domain circuit into a phasor/frequency domain circuit. Hence, we can apply the KCL laws and other theorems to directly set up phasor equations involving our target variable(s) for solving. Next we f ...
Document
... Our voltage source also has a 377 ohm source impedance, divided into two resistors of 188.5 ohms each (Figure 2). When we turn the signal generator source on, a sine wave begins to propagate down the transmission line towards the load (Figure 2(b)). Since the characteristic impedance of the transmis ...
... Our voltage source also has a 377 ohm source impedance, divided into two resistors of 188.5 ohms each (Figure 2). When we turn the signal generator source on, a sine wave begins to propagate down the transmission line towards the load (Figure 2(b)). Since the characteristic impedance of the transmis ...
Zobel network
For the wave filter invented by Zobel and sometimes named after him see m-derived filters.Zobel networks are a type of filter section based on the image-impedance design principle. They are named after Otto Zobel of Bell Labs, who published a much-referenced paper on image filters in 1923. The distinguishing feature of Zobel networks is that the input impedance is fixed in the design independently of the transfer function. This characteristic is achieved at the expense of a much higher component count compared to other types of filter sections. The impedance would normally be specified to be constant and purely resistive. For this reason, they are also known as constant resistance networks. However, any impedance achievable with discrete components is possible.Zobel networks were formerly widely used in telecommunications to flatten and widen the frequency response of copper land lines, producing a higher-quality line from one originally intended for ordinary telephone use. However, as analogue technology has given way to digital, they are now little used.When used to cancel out the reactive portion of loudspeaker impedance, the design is sometimes called a Boucherot cell. In this case, only half the network is implemented as fixed components, the other half being the real and imaginary components of the loudspeaker impedance. This network is more akin to the power factor correction circuits used in electrical power distribution, hence the association with Boucherot's name.A common circuit form of Zobel networks is in the form of a bridged T. This term is often used to mean a Zobel network, sometimes incorrectly when the circuit implementation is, in fact, something other than a bridged T.Parts of this article or section rely on the reader's knowledge of the complex impedance representation of capacitors and inductors and on knowledge of the frequency domain representation of signals.↑