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US 2003/0199253 A1Published application
Multi-frequency synthesizer apparatus and method
AssigneeIntel Corporation
InventorLuiz M. Franca-Neto
Life of this patent
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Abstract
A frequency synthesizer, a multi-channel carrier generator, and a transceiver, as well as a method for generating a sub-carrier frequency are described.
Claims29
An apparatus, comprising:
- a frequency-update module including a sub-threshold low-pass filter, a reference signal input coupled to a first chain of flip-flops, and a comparison signal input coupled to a second chain of flip-flops;
- and an oscillator coupled to the sub-threshold low-pass filter.
A generator, comprising:
- a first apparatus having a common reference frequency input, comprising:
- a frequency-update module having a first sub-threshold low-pass filter, a reference signal input coupled to a clocked output of a first chain of flip-flops coupled to the common reference frequency input, and a comparison signal input coupled to a clocked output of a second chain of flip-flops coupled to a first generated frequency input;
- and
- an oscillator coupled to the first sub-threshold low-pass filter and the first generated frequency input;
- and
- a second apparatus coupled to the common reference frequency input, comprising:
- a frequency-update module having a second sub-threshold low-pass filter, a reference signal input coupled to a clocked output of a first chain of flip-flops coupled to the common reference frequency input, and a comparison signal input coupled to a clocked output of a second chain of flip-flops coupled to a second generated frequency input;
- and
- an oscillator coupled to the second sub-threshold low-pass filter and the second generated frequency input.
6 more elements
A transceiver, comprising:
- a transmitter;
- a receiver;
- and
- a generator coupled to the transmitter and the receiver, comprising:
- a first apparatus having a common reference frequency input, comprising:
- a frequency-update module having a first sub-threshold low-pass filter, a reference signal input coupled to a clocked output of a first chain of flip-flops coupled to the common reference frequency input, and a comparison signal input coupled to a clocked output of a second chain of flip-flops coupled to a first generated frequency input;
- and
- an oscillator coupled to the first sub-threshold low-pass filter and the first generated frequency input;
- and
- a second apparatus coupled to the common reference frequency input, comprising:
- a frequency-update module having a second sub-threshold low-pass filter, a reference signal input coupled to a clocked output of a first chain of flip-flops coupled to the common reference frequency input, and a comparison signal input coupled to a clocked output of a second chain of flip-flops coupled to a second generated frequency input;
- and
- an oscillator coupled to the second sub-threshold low-pass filter and the second generated frequency input.
10 more elements
A method of generating a sub-carrier frequency, comprising:
- providing a reference frequency to a reference frequency input of a first chain of flip-flops;
- feeding back a sub-carrier frequency from an oscillator to a second chain of flip-flops;
- providing a clocked output of the first chain of flip-flops as a reference signal input to a phase detector, and a clocked output of the second chain of flip-flops as a comparison signal input to the phase detector to produce a phase output including high-frequency signal components;
- filtering out some portion of the high frequency signal components from the phase output using a sub-threshold low-pass filter to produce a filtered phase output;
- and
- providing the filtered phase output to the oscillator.
3 more elements
Dependencies are inferred from the claim text.