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a/d converter and signal processing unit

A technology of conversion device and conversion operation, which is applied in the direction of analog/digital conversion, reversible analog/digital converter, electrical components, etc., which can solve the problems of research and development cost and increase of research and development cycle

Inactive Publication Date: 2011-12-21
DENSO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, R&D costs and R&D cycles will inevitably increase

Method used

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  • a/d converter and signal processing unit
  • a/d converter and signal processing unit
  • a/d converter and signal processing unit

Examples

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Effect test

no. 1 example

[0030] see figure 1 The cyclic A / D conversion device 1 is provided in, for example, a semiconductor integrated circuit device (IC) mounted in an electronic control unit (ECU) for a vehicle. The cyclic A / D conversion device 1 is configured to perform an A / D conversion operation and a D / A conversion operation. The cyclic A / D conversion device 1 is manufactured using a CMOS process.

[0031] The input terminal of the parallel A / D conversion circuit 2 with a resolution of 1.5 bits (m=1.5) is selectively connected to one of the signal input terminal 3 and the output terminal of the operational amplifier 4 via the switch S1, or is connected to an unconnected Location. The signal input terminal 3 is supplied with an input signal voltage (external signal voltage) Vin as a target of A / D conversion. When performing an A / D conversion operation, the input terminal of the A / D conversion circuit 2 is selectively connected to one of the signal input terminal 3 and the output terminal of t...

no. 2 example

[0100] Next, refer to Figure 11 to Figure 15 A second embodiment of the present invention is described, wherein the same elements as in the first embodiment are given the same reference numerals.

[0101] see Figure 11 , a cyclic A / D conversion means 31 is provided to perform an A / D conversion operation and a D / A conversion operation, as figure 1 The case of the cyclic A / D conversion device 1 exemplified in . The input terminal of the A / D conversion circuit 2 is selectively connected to one of the signal input terminal 3 and the output terminal of the operational amplifier 4 via a switch S31. Each of the lower electrodes (common-side electrodes) of the capacitors CS1 and CS2 is connected to the common line 32 . The common line 32 is connected to the inverting input terminal of the operational amplifier 4 via the switch S32, and is connected to the ground terminal GND via the switch S33. Upper electrodes (non-common side electrodes) of capacitors CS1 and CS2 are selective...

no. 3 example

[0138] Next, refer to Figure 16 A third embodiment of the present invention is described, wherein the same elements as in the previous embodiments are given the same reference numerals.

[0139] see Figure 16 , cyclic A / D conversion means 41 are provided to perform differential operations. The cyclic A / D conversion device 41 is Figure 11 The differential configuration of the cyclic A / D conversion device 31 exemplified in . A parallel A / D conversion circuit 42 having a resolution of 1.5 bits is configured to perform a differential operation, and an operational amplifier 43 is configured to supply a differential output. The non-inverting input terminal of the A / D conversion circuit 42 is selectively connected to one of the non-inverting signal input terminal 3p and the non-inverting output terminal of the operational amplifier 43 via the switch S31p. Similarly, the inversion input terminal of the A / D conversion circuit 42 is selectively connected to one of the inversion s...

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Abstract

An A / D converter device is provided, which has a D / A conversion function and changes a resolution of A / D conversion and D / A conversion. The A / D converter device is configured to selectively execute an A / D conversion operation and a D / A conversion operation, by the operation of a control circuit controlling switching of switches according to an ADC / DAC function switching signal supplied from an external side. The A / D conversion operation performs A / D conversion of an input signal voltage inputted via a signal input terminal from an external side and outputs an A / D conversion value of 12 bits. The D / A conversion operation outputs, via a signal output terminal, an analog voltage produced by performing D / A conversion of a digital value supplied from the external side.

Description

technical field [0001] The invention relates to a cyclic A / D conversion device and a signal processing unit provided with the cyclic A / D conversion device. Background technique [0002] As common output formats of sensor devices such as pressure sensor devices and current sensor devices, there are analog output formats and digital output formats. The former format outputs a signal output from a sensor element as an analog signal (usually a voltage) to the outside of the sensor device after performing analog signal processing such as amplification. The latter format outputs a signal output from a sensor element as a digital value to the outside of the sensor device after performing analog-to-digital (A / D) conversion. In general, the required output format of a sensor device differs depending on the application in which the sensor device is used. Therefore, in the past, the circuit of the output stage was appropriately designed according to the required output format, or the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M1/02
CPCH03M1/403H03M1/0695
Inventor 牧原哲哉堀江真清
Owner DENSO CORP
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