Low-power low-phase-noise oscillator
AssigneeTexas Instruments Incorporated
InventorsSeong-Ryong Ryu, Ali Kiaei
Life of this patent
Estimating the term…
Abstract
The present disclosure describes a low-power, low-phase-noise (LPLPN) oscillator. The LPLPN oscillator includes a resonator load, an amplifier stage, and a loop gain control circuit. The resonator load is structured to resonate at a primary resonant frequency. The amplifier stage is coupled with the resonator load to develop a loop gain that peaks at the primary resonant frequency. The loop gain control circuit is coupled with the amplifier stage, and it is structured to regulate the loop gain for facilitating the amplifier stage to generate an oscillation signal at the primary resonant frequency and suppress a noise signal at a parasitic parallel resonant frequency (PPRF).
Claims20
An oscillator, comprising:
- a micro-electromechanical system based (MEMS-based) resonator structured to resonate at a primary resonant frequency;
- a pair of cross-coupled amplifiers coupled with the MEMS-based resonator to develop a loop gain peaking at the primary resonant frequency;
- and
- an inductive-capacitive (LC) degeneration circuit coupled with the pair of cross-coupled amplifiers, and structured to regulate the loop gain for facilitating the pair of cross-coupled amplifiers to generate an oscillation signal at the primary resonant frequency and suppress a noise signal at a parasitic parallel resonant frequency (PPRF).
An oscillator, comprising:
- an inductive-capacitive (LC) load network structured to resonate at a primary resonant frequency;
- a first stage amplifier coupled with a first end of the LC load network;
- a second stage amplifier cross-coupled with the first stage amplifier, and coupled with a second end of the LC load network to jointly develop a loop gain with the first stage amplifier;
- and
- a loop gain control circuit coupled between the first stage amplifier and the second stage amplifier, the loop gain control circuit structured and routed to increase the loop gain above unity at the primary resonant frequency and reduce the loop gain below unity at a parasitic parallel resonant frequency (PPRF).
An oscillator system, comprising:
- a first die having a micro-electromechanical system based (MEMS-based) resonator structured to resonate at a primary resonant frequency;
- a second die having:
- a pair of cross-coupled amplifiers coupled with the MEMS-based resonator to develop a loop gain peaking at the primary resonant frequency;
- and
- a LC degeneration circuit coupled with the pair of cross-coupled amplifiers, and structured to regulate the loop gain for facilitating the pair of cross-coupled amplifier to generate an oscillation signal at the primary resonant frequency and suppress a noise signal at a parasitic parallel resonant frequency (PPRF);
- and
- interconnects coupling the MEMS-based resonator with the pair of cross-coupled amplifiers, thereby creating a parasitic structure contributing to the PPRF.
Dependencies are inferred from the claim text.