current_man
Tuesday, 17 January 2012
An electrical network is an interconnection of electrical elements such as resistors,
inductors,
capacitors,
transmission lines, voltage sources, current sources and switches.
An electrical circuit is a special type of network, one that has a
closed loop giving a return path for the current. Electrical networks
that consist only of sources (voltage or current), linear lumped
elements (resistors, capacitors, inductors), and linear distributed
elements (transmission lines) can be analyzed by algebraic and transform
methods to determine DC response, AC response, and transient response.
A resistive circuit is a circuit containing only resistors and ideal current and voltage sources. Analysis of resistive circuits is less complicated than analysis of circuits containing capacitors and inductors. If the sources are constant (DC) sources, the result is a DC circuit.
A network that contains active electronic components is known as an electronic circuit. Such networks are generally nonlinear and require more complex design and analysis tools.
To design any electrical circuit, either analog or digital, electrical engineers need to be able
to predict the voltages and currents at all places within the circuit. Linear circuits, that is, circuits with the same input and
output frequency, can be analyzed by hand using complex number theory. Other circuits can only be analyzed
with specialized software programs or
estimation techniques such as the piecewiselinear model.
Circuit simulation software, such as HSPICE, and languages such as VHDLAMS and verilogAMS allow engineers to design circuits without the time, cost and risk of error involved in building circuit prototypes.
Once the steady state solution is found, the operating points of each element in the circuit are known. For a small signal analysis, every nonlinear element can be linearized around its operation point to obtain the smallsignal estimate of the voltages and currents. This is an application of Ohm's Law. The resulting linear circuit matrix can be solved with Gaussian elimination.
A resistive circuit is a circuit containing only resistors and ideal current and voltage sources. Analysis of resistive circuits is less complicated than analysis of circuits containing capacitors and inductors. If the sources are constant (DC) sources, the result is a DC circuit.
A network that contains active electronic components is known as an electronic circuit. Such networks are generally nonlinear and require more complex design and analysis tools.
Contents[hide] 
[edit] Design methods
Linear Network Analysis  

Elements  


Components  


Series and parallel circuits  


Impedance transforms  


Generator theorems  Network theorems 


Network analysis methods  


Twoport parameters  


Circuit simulation software, such as HSPICE, and languages such as VHDLAMS and verilogAMS allow engineers to design circuits without the time, cost and risk of error involved in building circuit prototypes.
[edit] Electrical laws
A number of electrical laws apply to all electrical networks. These include: Kirchhoff's current law: The sum of all currents entering a node is equal to the sum of all currents leaving the node.
 Kirchhoff's voltage law: The directed sum of the electrical potential differences around a loop must be zero.
 Ohm's law: The voltage across a resistor is equal to the product of the resistance and the current flowing through it.
 Norton's theorem: Any network of voltage and/or current sources and resistors is electrically equivalent to an ideal current source in parallel with a single resistor.
 Thévenin's theorem: Any network of voltage and/or current sources and resistors is electrically equivalent to a single voltage source in series with a single resistor.
 See also Network analysis (electrical circuits).
[edit] Network simulation software
More complex circuits can be analyzed numerically with software such as SPICE or GNUCAP, or symbolically using software such as SapWin.[edit] Linearization around operating point
When faced with a new circuit, the software first tries to find a steady state solution, that is, one where all nodes conform to Kirchhoff's Current Law and the voltages across and through each element of the circuit conform to the voltage/current equations governing that element.Once the steady state solution is found, the operating points of each element in the circuit are known. For a small signal analysis, every nonlinear element can be linearized around its operation point to obtain the smallsignal estimate of the voltages and currents. This is an application of Ohm's Law. The resulting linear circuit matrix can be solved with Gaussian elimination.
[edit] Piecewiselinear approximation
Software such as the PLECS interface to Simulink uses piecewiselinear approximation of the equations governing the elements of a circuit. The circuit is treated as a completely linear network of ideal diodes. Every time a diode switches from on to off or vice versa, the configuration of the linear network changes. Adding more detail to the approximation of equations increases the accuracy of the simulation, but also increases its running time.Thursday, 12 January 2012
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