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High dynamic analog to digital counter
| Details |
Inventors: Poujois, Robert;
Assignee: Commissariat a l'Energie Atomique (FR)
Primary Examiner: Shoop, Jr.; William M.
Assistant Examiner: Young; Brian
Attorney, Agent or Firm: Hayes, Soloway, Hennessey & Hage
An analog to digital converter comprises coarse (15, 16) and fine (24, 19) quantization. The coarse quantization is of the frequency-current type or frequency-voltage frequency type. The fine quantization measures the discharge period of a residual charge stored in an integration capacitor (3) at the end of the coarse quantization phase. The discharger of this capacitor includes a capacitor (14) for quantifying this discharge. |
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DETAILED DESCRIPTION The object of the invention is to overcome these drawbacks by proposing a converter using a frequency-current or frequency-voltage conversion so as to obtain the digitalization high order values and taking account of the residual charge in order to draw up the low order values of this digitalization, but in which the references to be controlled are less numerous.
In particular, it is not necessary to define from this the discharge standard resistors and the conduction period of the swicthes is no longer critical.
In practice as regards the invention, a discharge (or a charge) of the integration capacitor of the integrator is used through another capacitor, known as a quantization capacitor, connected to a reference potential Vref by means of switches, this potential Vref being fixed for the drawing up of high order values and fixed or variable for the drawing up of low order values.
Accordingly, the object of the invention is to provide a high dynamic analog digital converter of the type comprising means to integrate a signal to be quantified for a given period, these integration means comprising means to accumulate charges originating from the signal to be quantified, means to inject into the accumulation means quantified electric charges in a number proportional to said signal to be quantified, the charges injected being of a polarity opposite the charges originating from the signal to be quantified, counting means known as rough counting means for counting the number of injected quantified charges and calculate from this a high order values quantization of the signal, means to take into account and discharge a residual electric charge accumulated in the accumulation means, counting means, known as fine counting means, in order to count a period corresponding to the discharge of the accumulated residual charge and calculate from this a low order values quantization of the signal, the injection means comprising a first generator of quantified charges and provided with a first charge quantization capacitor, wherein the taking into account and discharge means comprise a second charges generator provided with a second quantization capacitor
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Radio 
