A/d converter circuit and semiconductor integrated circuit
A converter circuit and converter technology, applied in the direction of analog-to-digital converter, analog/digital conversion, code conversion, etc., can solve the problems of increased design man-hours, large current consumption, large surface area, etc., and achieve the effect of preventing the increase of surface area
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no. 1 example
[0070] (Structure of Analog / Digital (A / D) Converter Circuit)
[0071] Figure 1A and 1B are an outline diagram and a conversion timing diagram of the A / D converter circuit 1 based on the first embodiment.
[0072] In this example, in the reference Figure 1A An A / D converter circuit 1 for converting an analog input signal into a numerical value is described at the same time.
[0073] The A / D converter circuit 1 includes an A / D converter unit (ADC) 10 , a search vector generator unit 20 , a digital corrector unit 30 , an error signal generator unit 40 and a coefficient search unit 50 .
[0074] The A / D converter unit 10 converts an analog input signal into a digital value representing an AD conversion result. The search vector generator unit 20 is based on each bit D of the digital value output from the A / D converter unit 10 i (k) Each bit of D i (k) approximation to compute the search vector δ i (k) . In this example, the search vector generator unit 20 based on each ...
no. 2 example
[0284] In the second embodiment, an A / D converter circuit capable of high-speed processing for performing time interleaving operation is described.
[0285] (when there are 2 time interleaves)
[0286] Figure 17A and Figure 17B are an outline diagram and a conversion timing diagram for describing the structure of the A / D converter circuit 2 based on the second embodiment.
[0287] Such as Figure 17A The A / D converter circuit 2 based on the second embodiment shown in includes A / D converter units (ADC) 10-1, 10-2, search vector generator units 20-1, 20-2, digital correction generator units 30-1, 30-2, error signal generator units 40-1, 40-2, coefficient search units 50-1, 50-2, and an output selector switch 75.
[0288] The A / D converter units 10-1, 10-2 convert an analog input signal into a digital value as an AD conversion result.
[0289] Search vector generator units 20-1, 20-2 are based on each D which is a digital value output from A / D converter units 10-1, 10-2, r...
no. 3 example
[0424] In the A / D converter circuits of the first and second embodiments, the structure capable of background operation was described, but the signal waveform of the analog input signal input to the A / D converter unit 10 may not always be within the weight coefficient Normal operation during search processing.
[0425] For example, if the analog input signal does not change, the conversion result from the A / D converter circuit is fixed, so the error signal is always zero. At this time, there is no rewriting of the weight coefficients, so the search process for the weight coefficients does not work either. In other words, this task will not operate correctly.
[0426] Therefore, a case is described in which a signal independent of an analog input signal is input in advance to perform search processing for weight coefficients and perform a foreground operation to search for weight coefficients.
[0427] Figure 26A and Figure 26B is a diagram for describing signals input to...
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