Method for adjusting signal generator and signal generator
AssigneeVerigy (Singapore) Pte. Ltd.
InventorKatsuya Yamashita
Life of this patent
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Abstract
Monitoring a spectrum of an inter-leaved signal by a signal generator which inter-leaves two DAC outputs with the same sampling rate, while adjusting the output offset level of each DAC, the output amplitude level of each DAC, the output selection timing of each DAC, and the output renewal timing of each DAC.
Claims20
A method for the adjustment of a signal generator for inter-leaving a first digital-to-analog converter and a second digital-to-analog converter operated under the same sampling rate and outputting signals obtained by synthesizing the output signals of the first and the second digital-to-analog converters, wherein said method comprises:
- a first step for adjusting the output offset of said first and second digital-to-analog converters such that when a direct current of the same level has been output from the first and second digital-to-analog converters, or when signals that do not contain a frequency component of said sampling rate have been output as said synthesized signals, the level in the spectrum of said synthesized signals of the frequency component that is the same as said sampling rate becomes lower than a first predetermined level or becomes the minimum, and
- a second step for adjusting the output level of said first and second digital-to-analog converters such that when signals of a first predetermined frequency have been output as said synthesized signals, the level in the spectrum of said synthesized signals becomes the same for two frequency components separated by said first predetermined frequency from the frequency that is the same as said sampling rate;
- the difference between said two levels becomes less than a second predetermined value or becomes the minimum;
- or the sum of said two levels becomes less than a third predetermined value or becomes the minimum,
- wherein the second step is repeated until the signal integrity value, when signals of the second predetermined frequency have been output as synthesized signals, satisfies a predetermined condition.
A method for the adjustment of a signal generator for inter-leaving a first and a second digital-to-analog converter that operate under the same sampling frequency and outputting signals obtained by synthesizing output signals of said first and said second digital-to-analog converters, said method comprising:
- adjusting the output offset of said first and said second digital-to-analog converters such that when a direct current of the same level is output from said first and said second digital-to-analog converters, or when signals that do not contain a frequency component of said sampling rate are output as said synthesized signals, the level in the spectrum of said synthesized signals of the frequency component that is the same as said sampling rate becomes lower than a predetermined value or becomes the minimum.
A method for the adjustment of a signal generator for inter-leaving a first and a second digital-to-analog converter that operate under the same sampling rate and outputting signals obtained by synthesizing the output signals of said first and said second digital-to-analog converters, said method comprising:
- adjusting the output level of said first and said second digital-to-analog converters such that when signals of a predetermined frequency have been output as said synthesized signals, the level in the spectrum of the synthesized signals becomes the same for two frequency components separated by said predetermined frequency from the frequency that is the same as said sampling rate;
- the difference between said two levels becomes less than a first predetermined value or becomes the minimum;
- or the sum of said two levels becomes less than a second predetermined value or becomes the minimum.
A method for the adjustment of a signal generator for inter-leaving a first and a second digital-to-analog converter that operate under the same sampling rate and outputting signals obtained by synthesizing the output signals of said first and said second digital-to-analog converters, wherein said method comprises:
- adjusting the timing with which are selected the output signals of said first and said second digital-to-analog converters such that when signals of a predetermined frequency have been output as synthesized signals, the level in the spectrum of said synthesized signals of two frequency components separated by said predetermined frequency from the frequency that is the same as said sampling rate becomes lower than a predetermined value or becomes the minimum.
A method for the adjustment of a signal generator for inter-leaving a first and a second digital-to-analog converter that operate under the same sampling rate and outputting signals obtained by synthesizing the output signals of said first and said second digital-to-analog converters, said method comprising:
- adjusting timing by which the output signals of said first digital-to-analog converter are renewed such that when signals of a first predetermined frequency have been output from said first digital-to-analog converter and a direct current has been output from said second digital-to-analog converter, the level of said first predetermined frequency component in the spectrum of said synthesized signals becomes the maximum;
- and
- adjusting the timing by which the output signals of said second digital-to-analog converter are renewed such that when a direct current has been output from said first digital-to-analog converter and signals of a second predetermined frequency have been output from said second digital-to-analog converter, the level of said second predetermined frequency component in the spectrum of said synthesized signals becomes the maximum.
A device that is a signal generator for inter-leaving a first and a second digital-to-analog converter that operate under the same sampling rate and outputting signals obtained by synthesizing the output signals of said first and said second digital-to-analog converters, wherein said device executes the steps comprising:
- a first step for adjusting the output offset of said first and said second digital-to-analog converters such that when a direct current of the same level has been output from said first and said second digital-to-analog converters, or signals that do not contain a frequency component of said sampling rate have been output as synthesized signals, the level in the spectrum of said synthesized signals of the frequency component that is the same as said sampling rate becomes lower than a first predetermined value or becomes the minimum, and
- a second step for adjusting the output level of said first and said second digital-to-analog converters such that when signals of a first predetermined frequency have been output as said synthesized signals, the level in the spectrum of the synthesized signals is the same for two frequency components separated by said predetermined frequency from the frequency that is the same as said sampling rate;
- the difference between said two levels becomes less than the first predetermined value or becomes the minimum;
- or the sum of said two levels becomes less than a second predetermined value or becomes the minimum,
- wherein said second step is repeated until the signal integrity value, when signals of a second predetermined frequency have been output as said synthesized signals, satisfies a predetermined condition.
A device that is a signal generator for inter-leaving a first and a second digital-to-analog converter that operate under the same sampling frequency and outputting signals obtained by synthesizing output signals of said first and said second digital-to-analog converters, said device comprising a control device for adjusting the output offset of said first and said second digital-to-analog converters such that when a direct current of the same level is output from said first and said second digital-to-analog converters, or when signals that do not contain a frequency component of said sampling rate are output as said synthesized signals, the level in the spectrum of said synthesized signals of the frequency component that is the same as said sampling rate becomes lower than a predetermined value or becomes the minimum.
A device that is a signal generator for inter-leaving a first and a second digital-to-analog converter that operate under the same sampling rate and outputting signals obtained by synthesizing the output signals of said first and said second digital-to-analog converters, said device comprising a control device for adjusting the output level of said first and said second digital-to-analog converters such that when signals of a predetermined frequency have been output as said synthesized signals, the level in the spectrum of the synthesized signals becomes the same for two frequency components separated by said predetermined frequency from the frequency that is the same as said sampling rate;
- the difference between said two levels becomes less than a first predetermined value or becomes the minimum;
- or the sum of said two levels becomes less than a second predetermined value or becomes the minimum.
A device that is a signal generator for inter-leaving a first and a second digital-to-analog converter that operate under the same sampling rate and outputting signals obtained by synthesizing the output signals of said first and said second digital-to-analog converters, wherein said device comprises a control device for adjusting the timing with which are selected the output signals of said first and said second digital-to-analog converters such that when signals of a predetermined frequency have been output as synthesized signals, the level in the spectrum of said synthesized signals of two frequency components separated by said predetermined frequency from the frequency that is the same as said sampling rate becomes lower than a predetermined value or becomes the minimum.
A device that is a signal generator for inter-leaving a first and a second digital-to-analog converter that operate under the same sampling rate and outputting signals obtained by synthesizing the output signals of said first and said second digital-to-analog converters, wherein said device comprises a control device that executes the following steps comprising:
- adjusting timing by which the output signals of said first digital-to-analog converter are renewed such that when signals of a first predetermined frequency have been output from said first digital-to-analog converter and a direct current has been output from said second digital-to-analog converter, the level of said first predetermined frequency component in the spectrum of said synthesized signals becomes the maximum;
- and
- adjusting the timing by which the output signals of said second digital-to-analog converter are renewed such that when a direct current has been output from said first digital-to-analog converter and signals of a second predetermined frequency have been output from said second digital-to-analog converter, the level of said second predetermined frequency component in the spectrum of said synthesized signals becomes the maximum.
Dependencies are inferred from the claim text.