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Circuit for signal conditioning with a shared oscillator

A technology of signal conditioning and oscillating signals, applied in demodulation, electrical components, modulation transfer, etc., can solve problems such as increased correlation and lack of overall noise

Active Publication Date: 2008-10-15
ROHDE & SCHWARZ GMBH & CO KG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The substantive issue in this case is that the oscillators assigned to the stages implement independently of each other
The phase fluctuations of the individual oscillators and clock generators are therefore completely uncorrelated with each other, increasing the overall noise due to the lack of correlation

Method used

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  • Circuit for signal conditioning with a shared oscillator
  • Circuit for signal conditioning with a shared oscillator
  • Circuit for signal conditioning with a shared oscillator

Examples

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Embodiment Construction

[0011] The circuit arrangement according to the prior art shown in FIG. 1 comprises several signal processing stages formed by a digital / analog converter 1 , an I / Q modulator 2 , mixers 3 and 4 and a switching unit 5 .

[0012] The in-phase component (I) and the quadrature component (Q) of the digital baseband signal are supplied to the digital / analog converter 1 via two lines. A clock pulse signal obtained from the first oscillator 12 is supplied to a third input terminal of the digital / analog converter 1 . The converted analog signal is supplied to the input of the I / Q modulator 2 with its I and Q components. The oscillating signal generated by the second oscillator 13 is supplied to a third input terminal of the I / Q modulator 2 .

[0013] The I / Q modulated signal is supplied to a first input of a first mixer 3 . A frequency-variable signal obtained from a third oscillator 14 is supplied from a synthesizer 10 such as a PLL (Phase Locked Loop) to a second input terminal as ...

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Abstract

The invention relates to a signal conditioning circuit with a digital / analog converter (1), an I / Q modulator (2) and at least one mixer (3, 4). According to the invention, instead of a multiplicity of oscillators for the individual stages (21-24), a single oscillator (16) is used. The total noise of the stages (21-24) is decreased by the resulting correlation.

Description

technical field [0001] The present invention relates to circuits utilizing a common oscillator for signal conditioning in several stages to reduce noise. Background technique [0002] In multi-stage signal conditioning applications, eg including digital / analog converters, I / Q modulators and several mixers, the signal / noise ratio deteriorates step by step. The essential problem in this case is that the oscillators assigned to the stages are implemented independently of each other. The phase fluctuations of the individual oscillators and clock generators are therefore completely independent of each other, so that the overall noise increases due to the lack of correlation. Contents of the invention [0003] It is an object of the present invention to minimize phase noise in multi-stage signal conditioning circuits. [0004] According to the invention, in a multi-stage signal conditioning circuit with a digital / analog converter, an I / Q modulator and at least one mixer, a sin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03D7/16
CPCH03C3/40H03D7/165H03D7/16H03K3/0231
Inventor 马丁·罗思马蒂亚斯·耶伦戈特弗里德·霍尔茨曼艾伯特·莫泽马丁·厄特延
Owner ROHDE & SCHWARZ GMBH & CO KG