A balanced Pierce crystal oscillator with bias-stabilising loops, and possessing resistance to supply line noise and voltage fluctuation

A balanced Pierce crystal oscillator with bias-stabilising loops, and possessing resistance to supply line noise and voltage fluctuation

A balanced Pierce crystal oscillator comprises two common-base transistors 10 and 11. Oscillation amplitude is controlled by varying the current sources 53 and 54 connected to the emitter nodes 19 and 20. The DC collector voltages on nodes 8 and 9 are stabilised by the bias loop amplifier 44 acting...

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Bibliographische Detailangaben
1. Verfasser: JACOB MIDTGAARD
Format: Patent
Sprache:eng
Schlagworte:
BASIC ELECTRONIC CIRCUITRY
ELECTRICITY
GENERATION OF NOISE BY SUCH CIRCUITS
GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING,BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN ANON-SWITCHING MANNER
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Beschreibung
Zusammenfassung:A balanced Pierce crystal oscillator comprises two common-base transistors 10 and 11. Oscillation amplitude is controlled by varying the current sources 53 and 54 connected to the emitter nodes 19 and 20. The DC collector voltages on nodes 8 and 9 are stabilised by the bias loop amplifier 44 acting on current sources 46 and 47 to match the common-mode collector voltage to the reference voltage 45. Loop amplifier 41 controls current sources 42 and 43 to null the differential DC voltage on nodes 8 and 9. The use of current sources in both the collector and emitter circuits renders the oscillator insensitive to noise and voltage fluctuation on the supply lines.