By Ken Kundert

The Designer's advisor to SPICE and Spectre® is an in-depth consultant to circuit simulators from a designer's point of view: the pitfalls of circuit simulation, equivalent to convergence and accuracy difficulties, are defined in phrases a circuit fashion designer is cozy with. The booklet provides designers perception into why those difficulties take place and the way to prevent them. It additionally presents useful suggestion on tips on how to make many tricky measurements with a circuit simulator, resembling loop achieve of an op-amp or distortion measurements of such clocked circuits as d-to-a converters and sample-and-hold circuits. eventually, feedback are given approximately easy methods to deal with tricky periods of circuits, equivalent to oscillators, charge-storage or very huge circuits. After analyzing The Designer's advisor to SPICE and Spectre®, you'll spend much less time scuffling with your simulator and extra time exploring, figuring out and designing your circuits.
Audience: Written for practicing analog and mixed-signal circuit designers who're already acquainted with the fundamentals of working SPICE. beneficial for an individual who makes use of a circuit simulator, regardless of which, because the focal point is at the primary features and behaviour of circuit simulators in most cases.

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As thyristors can only conduct current in one direction, the current flow is 1. starting from a supply phase (in the Figure L1) 2. e. conducting, thyristor in the upper half-bridge (in the Figure T1) 3. continuing via the motor 4. continuing via a triggered thyristor in the lower half-bridge (in the Figure T6) 5. and back to another supply phase (in the Figure L3). Two supply phases and each one thyristor from the upper half-bridge and lower half bridge are therefore always participating in the current flow.

4 Variable-speed drives using DC motors The following rule applies: A positive excitation current and a positive armature current generate a positive torque and accelerate an unloaded motor in the positive direction (clockwise when looking at the motor shaft). A negative excitation current and a negative armature current also generate a positive torque and also accelerate an unloaded motor in the positive direction. If the polarities of the excitation and armature currents are different, then an unloaded motor will accelerate in the negative direction.

18 Circuit configuration of a DC motor with series-wound characteristic Of particular interest here is that the armature current flows through the excitation winding. The resulting magnetic field in the motor is no longer constant, but dependent on the motor load. This leads to the characteristic operating behaviour of the series-wound motor. 19). Series-wounds motors respond very “soft” to changes in load. Under no-load conditions, only the remanent flux of the motor is active. The air-gap flux is very small, and not until the motor speed is very high does it induce a motor voltage Vm large enough to compensate the armature voltage Va.

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