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Meissner oscillator

The classic oscillator used in radio technology is the LC oscillator, whose frequency is determined by the resonant frequency of an oscillating circuit and whose oscillation state is maintained via feedback. There are several principles that differ in the type of decoupling.

Decoupling can be transformer, inductive or capacitive. The various principles of LC coupling also differ in the decoupling. For example, the Meissner oscillator is based on transformer coupling between the oscillating circuit coil and a decoupling coil, whereas the Hartley oscillator operates inductively with coil tapping and the Colpitts osc illator with capacitive voltage divider.

LC oscillator with feedback, Meissner principle

LC oscillator with feedback, Meissner principle

As far as the Meissner oscillator is concerned, the oscillation frequency is generated by the oscillating circuit in the collector circuit and decoupled via a secondary coil and fed back to the base or to the emitter of the transistor, depending on the circuit design. The oscillating state is given when the phase position of the feedback signal supports the oscillating behavior of the oscillating circuit. Depending on which electrode the feedback leads to, it must be rotated in phase or the phase rotation in the transistor must be cancelled by opposing windings of the secondary coil.

The Meissner oscillator can only oscillate if the feedback signal supports the phase of the oscillator signal.

Informations:
Englisch: Meissner oscillator
Updated at: 20.03.2014
#Words: 215
Links: oscillator (OSC), radio technology, line conditioner (power supply) (LC), frequency (f), vertical interconnect access (PCB) (via)
Translations: DE
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