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Single-ended to differential signal converter based on n-path filter

A differential signal and single-ended signal technology, applied in the field of single-ended to differential signal converters, can solve problems such as signal noise, power consumption, and difficulty in obtaining fully differential signals

Pending Publication Date: 2020-12-22
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since they have a source component, they are relatively power hungry
It is also difficult to obtain a symmetrical fully differential signal from two parts of a circuit that is not functionally symmetrical
This active balun is also prone to signal noise and non-linear

Method used

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  • Single-ended to differential signal converter based on n-path filter
  • Single-ended to differential signal converter based on n-path filter
  • Single-ended to differential signal converter based on n-path filter

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Embodiment Construction

[0043] The following description is given by way of example to enable those skilled in the art to implement and use the present invention. The present invention is not limited to the embodiments described herein, and various modifications to the disclosed embodiments will be apparent to those skilled in the art. The embodiments are described by way of example only.

[0044] Described herein is a single-ended to differential signal converter that uses a single-ended N-channel filter to generate a differential signal (ie, a differential signal pair) from a single-ended input signal.

[0045] An N-channel filter (also called a channel selection filter) includes N identical parallel signal channels, where N is an integer greater than or equal to 2. Each channel includes: an input modulator, which downconverts the input signal to baseband; a low-pass filter circuit, which filters the baseband signal to generate a filtered baseband signal; and an output modulator, which converts th...

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Abstract

Single-ended to differential signal converters which use an N-path filter to perform the conversion. Specifically, the single-ended to differential signal converters comprise an N-path filter that comprises a plurality of paths wherein each path comprises a low pass filter circuit that is selectively connected to an input port of the converter, selectively connected to a first output port of the converter to generate a first output signal, and selectively connected to a second output port of the converter to generate a second signal that is 180 degrees out of phase with the first output signal. In this manner the first and second output signals form a differential pair of signals corresponding to the single-ended input signal.

Description

technical field [0001] This application relates to electronic circuits, and more particularly, to single-ended to differential signal converters. Background technique [0002] Wireless receivers receive single-ended signals and typically convert the received single-ended signals to differential signals (ie, differential signal pairs) for processing. In general, it is advantageous to convert a received single-ended signal to a differential signal (i.e., a differential signal pair) as early as possible, because the differential interface can suppress external interfering noise and suppress even-order distortion components (which is very important in direct-conversion receivers, Because the even-order components in low-frequency signals are difficult to filter out), and increase the gain (because the output voltage can be twice that of a single-ended signal). [0003] There are many known techniques for converting a single-ended signal to a differential signal, but many suffer...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03H7/42H03H19/00
CPCH03H19/002
Inventor 哈希姆·扎尔·霍西尼玛丽亚姆·沙里兰加纳坦·德西卡查里
Owner HUAWEI TECH CO LTD