Systems and methods for frequency-modulation
AssigneeBestechnic (Shanghai) Co., Ltd.
InventorsLu Chai, Wenyu Xiao
Life of this patent
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Abstract
Embodiments of oscillator circuits for wireless transmission of data are disclosed herein. In one example, an oscillator circuit includes an active network and a passive differential network coupled to the active network is disclosed. The active network is configured to generate an active signal for sustaining oscillation of the oscillator circuit. The passive network includes a first subnetwork, a second subnetwork, a first inductor and a second inductor. The first subnetwork is configured to adjust a central value of a resonant frequency of the oscillation. The passive network further includes a second subnetwork configured to further adjust the resonant frequency of the oscillation.
Claims20
An oscillator circuit, comprising:
- an active network configured to generate an active signal for sustaining oscillation of the oscillator circuit;
- and
- a passive network coupled to the active network, comprising:
- a first inductor connected to the active network at a first end of the first inductor;
- a first subnetwork coupled to the first end of the first inductor configured to adjust a central value of a resonant frequency of the oscillation, wherein the first subnetwork comprises:
- a first variable capacitor configured to adjust a total capacitance of the first subnetwork;
- and
- a first fixed capacitor connected in series with the first variable capacitor;
- a second subnetwork couple to a second end of the first inductor, opposite to the first end, configured to further adjust the resonant frequency of the oscillation, wherein the second subnetwork comprises a second variable capacitor configured to adjust a total capacitance of the second subnetwork;
- and
- a second inductor, connected in parallel with the second subnetwork at the second end of the first inductor, configured to improve a resolution of a frequency-modulation of the second subnetwork.
A system for radio frequency modulation, comprising:
- a capacitor array controller configured to generate a first control signal;
- a digital signal generator configured to generate a second control signal;
- an active network configured to generate an active signal for sustaining oscillation of the frequency modulation;
- and
- a passive network coupled to the active network, comprising:
- a first inductor connected to the active network at a first end of the first inductor;
- a first subnetwork coupled to the first end of the first inductor configured to adjust a central value of a resonant frequency of the oscillation based on the first control signal wherein the first subnetwork comprises:
- a first variable capacitor configured to adjust a total capacitance of the first subnetwork;
- and
- a first fixed capacitor connected in series with the first variable capacitor;
- a second subnetwork couple to a second end of the first indictor inductor, opposite to the first end, configured to further adjust the resonant frequency of the oscillation based on the second control signal, wherein the second subnetwork comprises:
- a second variable capacitor configured to adjust a total capacitance of the second subnetwork;
- and
- a second fixed capacitor connected in series with the second variable capacitor;
- and
- a second inductor, connected in parallel with the second subnetwork at the second end of the first inductor, configured to improve a resolution of a frequency-modulation of the second subnetwork.
A method for modulating an oscillating signal, comprising:
- generating, by an active network, an active signal for sustaining oscillation of an oscillator circuit;
- and
- adjusting, by a first subnetwork, a central value of a resonant frequency of the oscillation, wherein the first subnetwork comprises:
- a first variable capacitor configured to adjust a total capacitance of the first subnetwork;
- and
- a first fixed capacitor connected in series with the first variable capacitor;
- and
- adjusting, by a second subnetwork, the resonant frequency of the oscillation around the central value of the resonant frequency, wherein the second subnetwork comprises a second variable capacitor configured to adjust a total capacitance of the second subnetwork, wherein the first subnetwork is coupled to a first end of a first inductor and the second subnetwork is coupled to a second end of the first inductor, and wherein the first inductor is connected to the active network at the first end.
Dependencies are inferred from the claim text.