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Circuit with voltage drop element

A technology of voltage drop components and circuits, applied to electrical components, amplifiers with semiconductor devices/discharge tubes, components of amplifiers, etc.

Active Publication Date: 2018-12-21
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This voltage will cause transistor MP to compress earlier than transistor Q1, so it is not optimal for linearity

Method used

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  • Circuit with voltage drop element
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  • Circuit with voltage drop element

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Embodiment Construction

[0071] The detailed description follows with reference to the accompanying drawings, which form a part hereof, and show by way of illustration specific aspects in which the invention may be practiced. It is to be understood that other aspects may be utilized and structural or logical changes may be made without departing from the scope of the present invention. Accordingly, the following detailed description is not to be taken as limiting, but the scope of the present invention is defined by the appended claims.

[0072] It is to be understood that comments made in relation to a described device, circuit or system apply equally to the corresponding method and vice versa. For example, if a specific method step is described, a corresponding device may include means for performing the described method step, even if such means are not explicitly set forth or illustrated in the drawings. Further, it can be understood that the features of various exemplary aspects described herein ...

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Abstract

The disclosure relates to a circuit, comprising: a circuit input; a circuit output; at least one passive feedback loop coupled between the circuit output and the circuit input; an active element, in particular a DC coupled operational amplifier (OPAMP), coupled in a feed-forward path of the circuit between the circuit input and the circuit output and configured to drive the at least one feedback loop in order to establish a function of the circuit, wherein the feed-forward path of the circuit comprises a second node (Vx) and a first node which are internal nodes of the active element and whichare coupled between the circuit input and the circuit output, wherein the first node is configured to have a first voltage, the first voltage being a function of the circuit output, wherein the active element comprises a first voltage drop element coupled between the second node (Vx) and the first node, and wherein the first voltage drop element is configured to decouple a DC level at the first node from a DC level at the second node and configured to provide the DC level at the first node independently from the DC level at the second node.

Description

technical field [0001] The invention relates to a circuit including a voltage drop element which can be used for linear expansion and noise reduction in a DC coupling system. The invention also relates to analog circuit design, in particular to DC coupled voltage amplifiers. Background technique [0002] figure 1 A typical DC coupled analog baseband chain 100 is depicted. In those systems, the signal is amplified by a programmable gain amplifier (PGA for short) 101 , filtered by a low pass filter (LPF for short) 102 , and then sent to a driver (DRV for short) 103 middle. The active blocks are obtained by means of closed-loop DC-coupled voltage amplifiers or operational amplifiers (OPAMP for short) 111 , 112 , 113 . Key characteristics of OPAMPs include noise, linearity, and power consumption. [0003] Since the useful signal also includes a DC component, a DC common mode must propagate along the chain and every block on the chain (PGA 101 , LPF 102 and DRV 103 ) needs t...

Claims

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Application Information

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IPC IPC(8): H03F1/32H03F3/45
CPCH03F3/20H03F3/45098H03F3/45103H03F2203/45722H03F1/3211H03F2203/45701H03F3/45475H03F2200/408H03F2200/447H03F2200/513H03F2203/45101H03F2203/45372H03F2203/45512H03F2203/45522H03F2203/45528H03F2203/45594H03F2203/45628H03F2203/45631H03F2203/45646H03F2203/45672H03F2203/45681H03F2203/45691H03F1/302H03F3/45201H03F2203/45626H03F3/45206
Inventor 朱塞佩·格拉美亚
Owner HUAWEI TECH CO LTD
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