US 7,032,195 B2Granted

Noise suppression component selecting method and program

AssigneeMurata Manufacturing Co., Ltd.

InventorsHaruhiko Ueno, Kazuyuki Doshita

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Abstract

In a method of selecting a suitable noise suppression component, an input signal to a digital circuit including a transmitter IC, a noise suppression filter, a transmission line, and a receiver IC is expanded by Fourier expansion so as to express the input signal in terms of a series sum of sine waves. The Fourier-expanded input signal and the circuit constants of the digital circuit are used to calculate a signal on the input side of the receiver IC. Similar calculation is performed for all possible filters to assign scores for each of fundamental and harmonic components of the signal, while considering both the noise suppressing effect and the signal waveform quality. Total scores are calculated, and the filters are ranked from a high score to a low score.

Claims16

Dependent claims

A noise suppression component selecting method for selecting a noise suppression component suitable for noise suppression in a digital circuit, the method comprising:

a step of determining an amplitude and phase of a signal at a given position of the digital circuit when an input signal is input to the digital circuit;
a step of determining an amplitude and phase of the signal at the given position when the input signal is input to the digital circuit in the case where the circuit includes each of a plurality of noise suppression components;
a comparing step of comparing, for each order of fundamental and harmonic components, between the amplitude and phase of the signal at the given position determined in the case where the digital circuit includes each of the plurality of noise suppression components and the amplitude and phase of the signal at the given position determined in the case where the digital circuit does not include each of the plurality of noise suppression components;
a scoring step of scoring, for each order of fundamental and harmonic components, the compared amplitude and phase obtained in the comparing step determined in the cases where the digital circuit includes each of the noise suppression components and does not include each of the noise suppression components;
and
a summing step of calculating a total score by summing the scored amplitude and phase by weighting for each order.

3 more elements

A program for causing a computer to execute:

a procedure A of recording a circuit constant of a digital circuit;
a procedure B of expanding an input signal to the digital circuit into a series of sine waves by Fourier expansion;
a procedure C of calculating a signal at a given position of the digital circuit using the circuit constant recorded in the procedure A when the input signal expanded into a series of sine waves in the procedure B is input;
a procedure D of recording a circuit constant of the digital circuit in the case where the circuit includes one of a plurality of noise suppression components;
a procedure E of calculating a signal at the given position of the digital circuit using the circuit constant recorded in the procedure D when the input signal expanded into a series of sine waves in the procedure B is input;
a procedure F of determining a difference between the signal obtained in the procedure C and the signal obtained in the procedure E;
a procedure G of scoring an amplitude and phase of the signal difference determined in the procedure F for each harmonic order;
a procedure H of calculating a total score which is a sum of the scores obtained in the procedure G;
a procedure I of implementing the procedures D through G for all of the plurality of noise suppression components to determine the total score in the case where each of the noise suppression components is used;
and
a procedure J of ranking the noise suppression components from a high score to a low score based on the total scores obtained in the procedure I.

8 more elements

Dependencies are inferred from the claim text.

Facts

Application: 10/755,312Filed 13 Jan 2004
Priority: JP 2003-00936917 Jan 2003
Published: US 2004/0143804 A122 Jul 2004
Granted: 18 Apr 2006
Term ends: Not estimatedThe source records don’t support an estimate.

Classification5 codes

G06F 30/367
Circuit design at the analogue level: design verification, e.g. using simulation, simulation program with integrated circuit emphasis [SPICE],…
G06F 30/30
Computer-aided design [CAD]: circuit design
G06F 30/36
Circuit design: circuit design at the analogue level
G06F 2119/10
Details relating to the type or aim of the analysis or the optimisation: noise analysis or noise optimisation