Low voltage low-phase-noise oscillator
AssigneeThe Hong Kong University of Science and Technology
InventorsHoward Cam Luong, Ka-Chun Kwok
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Abstract
There is a disclosed an oscillator for generating a periodic signal, comprising a transistor and two electro-magnetically coupled inductors in positive feedback configuration, one of the inductors is connected to the drain or gate of the transistor, and the other being connected to the source to maintain the same phase of the two voltages at the two nodes. Two or more of such single ended oscillators can be connected together to form a differential oscillator, and the invention can be generalized by the use of any active device and not just transistors.
Claims19
A single-ended oscillator configured to generate a periodic signal, comprising a transistor and two electro-magnetically coupled inductors in positive feedback configuration, wherein one of the said inductors is connected to a first terminal of the transistor and the other is connected to a second terminal of the transistor to maintain the same phase of respective voltages at the two connections, wherein the oscillator includes only parasitic capacitances.
A multiple-output oscillator comprising a plurality of single ended circuits each of which comprises a transistor and two inductors with one of the inductors coupled to a first terminal of the transistor and the other coupled to a second terminal of the transistor, wherein the inductors in each of the single ended circuits are electro-magnetically coupled with inductors in another single ended circuit to form pairs of inductors in a ring configuration, and the multiple-output oscillator includes only parasitic capacitances.
An oscillator for generating a periodic signal, comprising:
- a transistor and two electro-magnetically coupled inductors configured in a positive feedback configuration void of any capacitor responsive to presence of parasitic capacitance, to generate the periodic signal, wherein one of the said inductors is coupled to a first terminal of the transistor and the other is coupled to a second terminal of the transistor to maintain respective voltages across the two couplings at substantially the same phase.
Dependencies are inferred from the claim text.