Oscillator with cross-coupling by diodes
AssigneeU.S. Philips Corporation
InventorAndreas Wichern
Life of this patent
Estimating the term…
Abstract
An oscillator arrangement is described including a resonant circuit having two poles from which an oscillation generated in the oscillator arrangement can be taken and including a differential amplifier of two emitter-coupled transistors having two collector electrodes of which each one is connected to one of the poles of the resonant circuit, and having two base electrodes cross-coupled to the poles of the resonant circuit. Such an oscillator arrangement can be constructed so as to generate a low-noise oscillation by means of a minimal number of circuit elements in that the base electrodes are each coupled to the poles of the resonant circuit via a diode configuration.
Claims8
An oscillator arrangement including:
- a resonant circuit having two poles via which an oscillation generated in the oscillator can be extracted, and
- a differential amplifier formed by two emitter-coupled transistors having
- two collector electrodes of which
- each one is connected to one of the poles of the resonant circuit, and
- two base electrodes cross-coupled to the poles of the resonant circuit only, characterized in that
- the base electrodes are each coupled to the poles of the resonant circuit via a diode configuration.
An oscillator circuit comprising:
- a first supply voltage terminal and a second supply voltage terminal,
- a resonant circuit, operably coupled to the first supply voltage terminal, and having a first pole and a second pole,
- a current supply, operably coupled to the second supply voltage terminal, and having a current supply node,
- a first transistor and a second transistor, each transistor having a first terminal, a second terminal, and a third terminal,
- the first terminal of the first transistor being coupled to the first pole,
- the first terminal of the second transistor being coupled to the second pole,
- the second terminal of the first transistor being coupled to the current supply node,
- the second terminal of the second transistor being coupled to the current supply node,
- the third terminal of the first transistor being coupled to the second pole only, via a first diode configuration,
- the third terminal of the second transistor being coupled to the first pole only, via a second diode configuration.
Dependencies are inferred from the claim text.