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Sampling input stage with multiple channels

A channel, differential input technology, applied in the field of ADC

Active Publication Date: 2016-04-27
MICROCHIP TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This cannot be improved by conventional circuit design techniques

Method used

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  • Sampling input stage with multiple channels
  • Sampling input stage with multiple channels
  • Sampling input stage with multiple channels

Examples

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Embodiment Construction

[0019] In the present invention, the input stage according to various embodiments may be used in any analog system that incorporates an input and selects between multiple analog channels. The use of an input stage in a pipelined ADC as disclosed is limited to the current / preferred embodiment. Other applications using multiplexed inputs are applicable.

[0020] According to various embodiments, the ADC input is sampled onto n identical elements, which are then combined, where n is at least n=2 (通道数目-1) . Each channel may provide eg differential inputs IN_P, IN_N. Thus, for example, in a 4-channel embodiment, at least 8 identical elements are used, as will be explained in more detail below.

[0021] The embodiment disclosed below will use 4 channels and thus 16 identical cells. Other configurations may use more or less of the same elements, depending on the above requirements / definitions. The multiplexer is also replicated n times and arranged differentially as it drives ea...

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Abstract

An analog input stage has m differential input channels, wherein m>l. The analog input stage is configured to select one of the m differential input channels and provide an output signal. The analog input stage has n identical selection units each having m differential channel inputs and one differential output, wherein n is at least 2111"1. Each selection unit is operable to be coupled to any of the differential input channels through respective differential multiplexer units, wherein the multiplexor units are driven to select one of the differential input channels and couple the selected differential channel input through a butterfly switch unit with the differential output of the selection unit. The differential output signals of the n selection units are combined whereby unwanted crosstalk from channels other than a selected channel are removed by cancellation.

Description

[0001] Cross References to Related Applications [0002] This application claims the benefit of US Provisional Application No. 61 / 875,597, filed September 9, 2013, which is incorporated herein in its entirety. technical field [0003] The present invention relates to a sampling input stage having multiple channels usable in an analog-to-digital converter (ADC), and in particular to an ADC with multiple channels reconfigurable time interleaving. However, this input stage can be used in other ADCs or analog circuits, especially those that require a high level of isolation between individual channels. Background technique [0004] Microcontrollers with integrated or separate ADCs can include multiple analog input channels. These individual channels are typically connected to a multiplexer circuit which then fully couples the selected channel with the ADC. Channels are typically selected via a control or configuration register that provides a number of selection bits, eg in a...

Claims

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Application Information

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IPC IPC(8): G11C27/02H03M1/12H03M1/06
CPCG11C27/02G11C27/024H03M1/066H03M1/1225H03M1/1033H03M1/167H03M1/12H03M1/08H03M1/1205H03M1/36H03M1/122
Inventor 丹尼尔·R·米查姆安德烈娅·帕尼加达戴维·施
Owner MICROCHIP TECH INC