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On-chip radio calibration

A technology for calibrating signals and calibrating circuits, which is applied in transmitter monitoring, transmission monitoring, electrical components, etc., and can solve problems such as resistance or capacitance value deviation, deviation, and large bandwidth

Active Publication Date: 2013-05-29
NANJING AVIACOMM SEMICON CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, process variations may cause large deviations in resistance or capacitance values, which in turn cause large deviations in bandwidth (typically as large as 40%)
Additionally, DC offset, in-phase / quadrature (I / Q) amplitude and phase mismatch, and local oscillator (LO) carrier leakage are other issues facing non-ideal transceivers

Method used

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  • On-chip radio calibration
  • On-chip radio calibration
  • On-chip radio calibration

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Embodiment Construction

[0014] The following description is provided to enable any person skilled in the art to make and use the invention, and is presented in the context of a particular application and its requirements. Various modifications to the disclosed embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other embodiments and applications without departing from the spirit and scope of the invention. Thus, the present invention is not limited to the embodiments shown, but is to be accorded the widest scope consistent with the principles and features disclosed herein.

[0015] overview

[0016] Embodiments of the present invention provide a solution for on-chip I / Q imbalance and carrier leakage calibration. Instead of relying on external test tones, an on-chip digital-to-analog converter (DAC) generates a simple quadrature signal that can be fed into a calibration loop to minimize carrier leakage and I / Q imbalance.

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Abstract

One embodiment of the present invention provides a quadrature-mixing transmitter for wireless communication. The transmitter includes a quadrature modulator comprising an in-phase (I) channel and a quadrature (Q) channel, a calibration-signal generator configured to generate calibration signals that are sent to the I channel and the Q channel, and a calibration circuit configured to calibrate an imbalance between the I channel and the Q channel. The modulator, the calibration-signal generator, and the calibration circuit are located on a same integrated circuit (IC) chip, thereby facilitating on-chip calibration of the imbalance between the I channel and the Q channel.

Description

technical field [0001] The present disclosure generally relates to radio frequency circuits used in wireless communication systems. More specifically, the present disclosure relates to radio frequency circuits that support on-chip calibration. Background technique [0002] Conventional wireless communication systems are usually designed for specific standards, such as GSM (Global System for Mobile Communications) or Wideband Code Division Multiple Access (W-CDMA), each of which requires a different carrier frequency. For example, the carrier frequency of a GSM signal varies from 800MHz to 1GHz, while that of W-CDMA varies between 2-3GHz. The current need for wireless service convergence where users can access different standards from the same wireless device is driving the development of multi-standard and multi-band transceivers capable of operating across the entire wireless communication spectrum (from 300 MHz to 3GHz) to transmit / receive wireless signals. [0003] Mul...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B17/00
CPCH04B17/0037H04B17/0015H04B17/00H04B17/104H04B17/11
Inventor 林中杰莫世雄崔岩张崇兴
Owner NANJING AVIACOMM SEMICON CO LTD