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| Overhead rail transportation systems |
| I claim: 1. A rail transportation system comprising a rail to be supported in an overhead position ... |
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| Modular antenna array |
| In accordance with the invention, an antenna array comprises a plurality of colinear non-parasitic ... |
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| Antenna window cover |
| Referring to FIG. 1, a plan view of a portion of a reentry-type missile in accordance with the ... |
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| High frequency voltage comparator circuit |
| It is therefore an object of the present invention to provide a voltage comparator circuit which ... |
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| Fast analog-digital converter with parallel structure |
| An object of the present invention therefore comprises the making of an analog/digital converter ... |
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| Averaging flash analog-to-digital converter |
| FIG. 1 is a block diagram of a conventional flash-type ADC where an input signal IN is applied to ... |
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| A/D converter circuit |
| It is an object of the present invention to provide an A/D converter circuit capable of improving ... |
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| Broadband omnidirectional microwave antenna for minimizing radiation toward the upper hemisphere |
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Successive approximation analog-to-digital converter using CMOS inverter with pull-up and/or pull-down switches
| Details |
Inventors: Kanzaki, Teruaki;
Assignee: Mitsubishi Denki Kabushiki Kaisha (Tokyo, JP)
Primary Examiner: Williams; Howard L.
Assistant Examiner:
Attorney, Agent or Firm: Lowe, Price, LeBlanc & Becker
According to the analog/digital converting apparatus of the invention, at the connecting part of the sampling capacity and inverter, there is provided an auxiliary circuit so that the potential at the connecting part reaches the clamp potential at high speeds, similar to a switching device set to invite the voltage application by a source voltage, and therefore, the conversion accuracy is not worsened, and the analog/digital conversion time is shortened even if the reference clock pulse is set at higher speeds. |
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DETAILED DESCRIPTION The invention is devised to solve these problems, and it is hence a primary object of the invention to provide an analog/digital converting apparatus designed to shorten the conversion time without deteriorating the accuracy of the analog/digital conversion even if a reference clock pulse is increased in speed.
The analog/digital converting apparatus of the invention comprises a pull up switching device and a pull down switching device connected at the connecting part of a sampling capacity and an inverter, and a control circuit for making both switching devices conductive only in case of converting into most significant bit.
Therefore, at the time of converting into the most significant bit, when the pull up switching device and pull down switching device are turned to be conductive, the potential at the connecting part of the sampling capacity and inverter is increased, whereby the connecting part reaches the clamp potential in a short time, thus realizing the state ready to compare the voltages correctly.
Even if the voltages are compared at high speed, the analog/digital conversion accuracy is not lowered during the conversion into the most significant bit.
The analog/digit converting apparatus of the invention comprises a pull tip switching device connected at the connecting part of a sampling capacity and an inverter, and a control circuit for making the switching device conductive only when the most significant bit is to be converted.
Therefore, when the pull rip switching device is rendered conductive at the time of converting into the most significant bit, the potential at the connecting part between the sampling capacity and inverter is increased, and the connecting part reaches the clamp potential in a short time, so that it is readily prepared to compare the voltages correctly.
Hence, even if the voltages are compared at high speeds, the analog/digital conversion accuracy is not deteriorated at the time of the conversion into the most significant bit.
Furthermore, the analog/digital converting apparatus of the invention comprises a second inverter connected at the connecting part of a sampling capacity and an inverter, a switching device for feeding back an output of the second inverter to the input side thereof, and a control circuit for making the switching device conductive only at the time of the conversion of the most significant bit
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