A/D conversion system

A conversion system and path switching technology, applied in analog conversion, code conversion, analog/digital/analog conversion, etc., can solve the problems of increasing circuit area and power consumption

Active Publication Date: 2015-03-25
DENSO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If an amplifier with a wide output signal range is used to solve the above problems, the circuit area and power consumption need to be increased

Method used

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Examples

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Embodiment Construction

[0020] According to one embodiment, as Figure 4 As shown, the 2-0 cascaded incremental delta-sigma (ΔΣ) A / D conversion system 17 is formed by a multi-stage loop filter (at least two filters). An input signal (voltage) Vin is input to the adder 1 . The output signal of the adder 1 is input to the first-stage integrator 3 through the amplifier 2, and the gain of the amplifier 2 is 1 / 4. The output signal of the integrator 3 is input to the final stage integrator 5 through the amplifier 4, and the gain of the amplifier 4 is 1. The output signal of the integrator 5 is input to the quantizer 7 through the adder 6 . The input signal Vin and the output signal of the integrator 3 are also input to the adder 6 to add to the output signal of the integrator 5 . The input signals of the adder 6 are weighted and added, respectively, as necessary. An output signal of a D / A converter (DAC) 20 is controlled based on the output of the quantizer 7 . The output signal of the D / A converter 2...

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Abstract

An input signal (Vin) is quantized by a quantizer (7) after being passed through plural loop filters (13,14). A last-stage loop filter is formed of an operational amplifier (15) for generating an output signal (Vin), a sampling capacitor (Cs) for sampling the input signal, an integrating capacitor for integrating the signal sampled by the capacitor and plural switches (S1 to S7) for switching over signal paths. A control circuit controls on / off states of the switches to discharge the sampling capacitor and the integrating capacitor and causes the loop filter to repeat a sampling operation and an integrating operation plural times. The control circuit (20) lastly connects the sampling capacitor and the integrating capacitor to a state, which is opposite to the state of the integrating operation time and turns on a converting switch (S8) so that the A / D converter A / D-converts the output signal of the loop filter.

Description

technical field [0001] The present invention relates to an A / D conversion system configured in a cascade type by employing delta-sigma (ΔΣ) modulators. Background technique [0002] In an A / D conversion system configured by employing a delta-sigma modulator, an input signal, that is, a voltage signal is filtered by a loop filter, and an output of the loop filter is quantized by a quantizer. When there is an error (variation) in the capacitance value of the capacitor used in the loop filter, the gain of the loop filter including the capacitor becomes erroneous, and thus the A / D conversion result becomes erroneous. In the case where an input signal is A / D-converted by a single-loop type A / D conversion system configured without cascading, the above-mentioned error is negligible. However, this requires many operation cycles and a longer time to output the A / D conversion result. [0003] When successively A / D converting input signals output from a plurality of sensors by switch...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M1/10
CPCH03M3/422H03M3/438H03M3/46H03M3/496H03M3/43H03M1/001H03M3/384H03M3/454
Inventor 根塚智裕
Owner DENSO CORP
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