Data converter system capable of avoiding interleave images and distortion products

A technology of data converters and products, applied in the direction of reversible analog/digital converters, analog/digital conversion calibration/testing, etc., can solve problems such as very expensive and large resource consumption

Active Publication Date: 2012-11-28
TEKTRONIX INC
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In some applications these techniques are acceptable, howe

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  • Data converter system capable of avoiding interleave images and distortion products
  • Data converter system capable of avoiding interleave images and distortion products
  • Data converter system capable of avoiding interleave images and distortion products

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[0014] As mentioned above, two or more data converters can be interleaved to provide the equivalent of a single data converter with a higher effective sampling rate, however interleaved data converters also produce Interlaced images caused by the mismatch between them. Now, in more detail, a DC bias error in a single data converter results in an error term located at DC. In interleaved systems, DC offset mismatches between interleaved data converters result in interleaved images at the base sampling rate of a single data converter and multiples of that frequency.

[0015] Thus, in one embodiment of the invention, the converted The input frequency "spans" or "avoids" spurious tones, and the interleaved data converter system avoids interleaved images caused by DC bias mismatches. The spurious tones can in turn be filtered out, providing an output signal with a much cleaner SFDR than conventional data converters.

[0016] Input gain and phase mismatches and sampling clock timi...

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Abstract

The invention relates to a data converter system capable of avoiding interleave images and distortion products. The data converter system supplies an output signal with low stray single frequency by making a converted input signal 'step over' or 'get rid of' the stray single frequency by limiting the input signal in an appointed frequency band and performing over-sampling; the stray single frequency can be filtered out; and therefore, compared with the conventional data converter, the data converter system can supply a much more cleaned output signal without a stray dynamic range. For example, according to the embodiment, the interleave data converter system converts the input signal which is limited in a second Nyquist region interleaved into a data converter into an interleave signal, so that a filter with a passband for transmitting a converted input frequency and a stop band for attenuating the stray single frequency is used for filtering the interleave signal; and the obtained output signal is provided with the bandwidth which is the same as that of the output signal obtained by the single data converter, but the obtained output signal is not influenced by the interleave images or some distortion products.

Description

technical field [0001] The present invention relates to data converters, and more particularly to data converter systems that avoid interleave images and distortion products. Background technique [0002] Data converters such as analog-to-digital converters (ADC), digital-to-analog converters (DAC) and track-and-hold (T / H) can be used in two ways. The first is as a "baseband data converter", where the data converter samples at a sampling rate ("Fs") that is at least twice as high as the highest frequency contained in the input signal. To prevent aliasing, the input frequency must be limited to a frequency range spanning DC to Fs / 2, or in other words, the input frequency must be "limited" to the first "Nyquist zone", where The first Nyquist interval is the frequency range spanning from DC to Fs / 2, the second Nyquist interval is the frequency range spanning Fs / 2 to Fs, and the third Nyquist interval is the spanning Fs to A frequency range of 3Fs / 2, and so on. The second way...

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Application Information

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IPC IPC(8): H03M1/02H03M1/10
Inventor R·D·舍帕德
Owner TEKTRONIX INC
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