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US 2011/0254635 A1Published application
Oscillating circuit
AssigneeMediatek Inc.
InventorsPing-Ying Wang, Hsiang-Hui Chang
Life of this patent
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Abstract
An oscillating circuit including a digital sigma-delta modulator and a controlled oscillator is disclosed. The digital sigma-delta modulator receives a fractional bit signal to generate a control signal. The controlled oscillator includes a varactor dynamically coupled to receive the control signal.
Claims21
An oscillating circuit, comprising:
- a digital sigma-delta modulator receiving a fractional bit signal to generate a control signal;
- and
- a controlled oscillator comprising a varactor dynamically coupled to receive the control signal.
A method for generating oscillating signals, comprising:
- performing sigma-delta modulation to a fractional bit signal to generate an control signal;
- controlling an output frequency of a controlled oscillator according to the control signal;
- and
- performing thermal code decoding to an integer bit signal to generate a first output signal to control the output frequency of the controlled oscillator.
1 more element
A method for generating oscillating signals, comprising:
- performing sigma-delta modulation to a fractional bit signal to generate an control signal;
- and
- dynamically coupling the control signal to a varactor of a controlled oscillator so as to control an output frequency of the controlled oscillator.
Dependencies are inferred from the claim text.