H03B 5/00 - Definition 
Definition statement
This subclass covers:
Oscillators with feedback comprising in particular
- LC circuits
- RC or RL circuits
- distributed reactances (e.g. striplines, cavity resonators, magneto-sensitive resonators)
- electromechanical resonators (e.g. piezo-electric resonators, magneto-strictive resonators)
Compensation of variations in parameters affecting the output frequency or amplitude of feedback oscillators (such as power supply, load or temperature) as far as a modification of the generator itself is concerned
Starting of feedback oscillators as long as a modification of the generator itself is concerned
References relevant to classification in this subclass
This subclass does not cover:
Generation of oscillations using transit-time effects | H03B 9/00 |
Generation of oscillations using galvano-magnetic devices | H03B 15/00 |
Informative references
Attention is drawn to the following places, which may be of interest for search:
Constructional details of electromechanical resonators and their holders and supports | H03H 9/00 |
Structural details of waveguide resonators | H01P 7/00 |
Glossary of terms
In this subclass, the following terms or expressions are used with the meaning indicated:
| Tank circuit | a parallel LC circuit, particularly in a high power transmitter circuit |
Synonyms and Keywords
In patent documents the following abbreviations are often used:
| AT cut | Particular angle of crystal cut |
| BAW resonator | Bulk acoustic wave resonator |
| SAW resonator | Surface acoustic wave resonator |
| Butler type oscillator | Colpitts (or Clapp) type oscillator with a series resonant crystal inserted in series between the emitter and the rest of the tank circuit. |
| Clapp type oscillator | Refinement of a Colpitts oscillator including an additional capacitor in series with the inductor. Series tuned version of the Colpitts oscillator. |
| Colpitts type oscillator | Oscillator with feedback via a capacitive voltage divider; can be LC or may include another resonator, e.g. a crystal, instead of or in addition to the inductor (L); can also be balanced |
| Hartley | LC oscillator with feedback via an inductive voltage divider |
| Pierce type oscillator | Oscillator comprising an amplifier, a crystal resonator connected in series in its feedback path and load capacitors at the input and output. |
| Wien bridge oscillator | Positive gain amplifier with a bridge circuit comprising a series RC circuit and a parallel RC circuit to provide positive feedback. |