Apparatus and method for phase noise self-test
AssigneeSilicon Laboratories Inc.
InventorsTamas Marozsak, Pio Balmelli
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Abstract
An integrated circuit (IC) having a radio receiver configured to perform a jitter self-test is disclosed. In one embodiment, an IC includes a radio receiver and a pulse generator. The pulse generator is configured to generate a pulse train based on a first periodic signal received from the radio receiver. The radio receiver is configured to use the pulse train to determine an amount of phase noise generated by a local oscillator of the radio receiver. The pulse generator and the radio receiver are implemented on the same IC die.
Claims20
An integrated circuit comprising:
- a radio receiver, wherein the radio receiver includes a local oscillator that is configured to generate a first periodic signal;
- and
- a pulse generator configured to generate a pulse train based on the first periodic signal;
- wherein the radio receiver is configured to use the pulse train to conduct a self-test to determine an amount of phase noise generated by the local oscillator.
A method comprising:
- generating a pulse train within an integrated circuit;
- providing the pulse train to a radio receiver located on the integrated circuit;
- and
- conducting a self-test to determine an amount of phase noise generated by a local oscillator of the radio receiver, wherein the self-test is conducted using the pulse train.
An integrated circuit comprising:
- a local oscillator including a crystal oscillator configured to generate a first periodic signal;
- a pulse generator coupled to receive first the periodic signal and configured to generate a pulse train at a frequency corresponding to the first periodic signal;
- a mixer coupled to receive a second periodic signal based on the pulse train and a third periodic signal from a local oscillator, wherein the second periodic signal has a frequency that is a harmonic multiple of a frequency of the pulse train, and wherein the mixer is configured to output a mixer output signal including a fourth periodic signal having a frequency less than the frequency of the second and third periodic signals;
- and
- a processing circuit configured to determine phase noise of the local oscillator based on the fourth periodic signal.
Dependencies are inferred from the claim text.