Low noise quantized feedback configuration

A transistor, drain technology used in sigma delta modulators to address issues of increased complexity and cost

Active Publication Date: 2020-01-07
SILICONINTERVENTION INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The common-mode control portion of circuit 100, i.e., the components below transistors M1 and M2, add complexity and cost

Method used

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  • Low noise quantized feedback configuration
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  • Low noise quantized feedback configuration

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Embodiment Construction

[0018] This application describes an improved ΣΔ modulator that can be used as an ADC. In one embodiment, the ΣΔ modulator has no common mode control loop and no reference current. This results in reduced complexity, ie fewer components, and reduced noise.

[0019] As mentioned above, figure 1 An example of a prior art ΣΔ modulator circuit 100 is shown in which an input difference current is caused to flow in the drains of transistors M1 and M2. This occurs because a fraction of the nominally equal currents of the current sources I1 and I2 flow through the resistor RSIG1 due to the input voltage VSIG1 which is applied to the gates of the transistors M1 and M2.

[0020] This configuration of the upper part of circuit 100 with current sources I1 and I2, transistors M1 and M2, resistor RSIG1 and input voltage source VSIG1 is well known to those skilled in the art and constitutes what is commonly referred to as voltage-to-current ( V to I) converter. The V to I converter conve...

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PUM

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Abstract

The invention provides a low noise quantized feedback configuration. Described herein is an improved apparatus for increasing the performance of a [sigma][delta] modulator, which may function as an ADC. In one embodiment, the [sigma][delta] modulator comprises a voltage to current converter, a capacitor connected between two outputs of the voltage to current converter to receive a differential input current, and a switch that can switch between connecting each output of the voltage to current converter to ground while disconnecting the other output of the voltage to current converter. In thisembodiment, the [sigma][delta] modulator has no common mode control loop, and no reference current. This results in decreased complexity, i.e., fewer components, as well as reduced noise.

Description

[0001] Cross References to Related Applications [0002] This application claims priority to Provisional Application No. 62 / 691,504, filed June 28, 2018, and U.S. Application No. 16 / 454,010, filed June 26, 2019, both of which are incorporated by reference Its entire content is incorporated herein. technical field [0003] The present invention relates generally to sigma delta modulators, and more particularly to sigma delta modulators without a common mode control loop. Background technique [0004] The analog-to-digital conversion can be performed using quantized feedback in the control loop. Analog-to-digital converters (ADCs) with such characteristics are often referred to as sigma delta (ΣΔ) converters or ΣΔ modulators, a modulator term referring to an output digital data stream with a certain pattern of symbols or controlled by a control loop. Modulation applied to it by the road. The terms ΣΔ modulator and noise shaping control loop are often used interchangeably in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F1/56
CPCG05F1/56
Inventor A·马丁·马林森
Owner SILICONINTERVENTION INC
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