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High linearity mixer and direct conversion receiver using the same

a direct conversion receiver and high linearity technology, applied in the field of direct conversion receivers, can solve the problems of linearity characteristics of the charge sampling mixer, the inability to apply the related art charge sampling receiver to a broadband application, and the significant limitation of the swing range of the output of the transconductance amplifying stage, etc., to achieve the improvement of the linearity and wideband characteristics of the mixing stage and the sampling filter, and the effect of low power consumption

Inactive Publication Date: 2011-06-23
ELECTRONICS & TELECOMM RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0011]An aspect of the present invention provides a structure in which the broadband characteristics and linearity (swing range) of a mixing stage and a sampling filter are improved under the conditions of a low power consumption and a low supply voltage.

Problems solved by technology

Thus, because the conversion gain of the anti-aliasing sinc filter installed in the charge sampling mixer has frequency dependency characteristics, it is difficult to apply the related art charge sampling receiver to a broadband application such as a digital TV tuner having a frequency band ranging from tens MHz to a few GHz.
Another drawback of the charge sampling mixer is linearity characteristics.
The swing of outputs from the transconductance amplifying stage and the sampling mixer is significantly limited due to the linearity characteristics of the receiver.

Method used

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  • High linearity mixer and direct conversion receiver using the same
  • High linearity mixer and direct conversion receiver using the same
  • High linearity mixer and direct conversion receiver using the same

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Embodiment Construction

[0021]Exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. The invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

[0022]In the drawings, the shapes and dimensions may be exaggerated for clarity, and the same reference numerals will be used throughout to designate the same or like components.

[0023]Unless explicitly described to the contrary, the word “comprise” and variations such as “comprises” or “comprising,” will be understood to imply the inclusion of stated elements but not the exclusion of any other elements.

[0024]FIG. 1 is a schematic functional block diagram of a direct conversion receiver including a high linearity mixer according to an exemplary ...

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Abstract

A direct conversion receiver includes: a high linearity mixer device including a sampler unit charge-sampling an input current according to a sampling frequency, and a buffer unit receiving an output signal from the sampler unit while having a low input impedance, amplifying the received signal, and outputting a current signal; and a filter device decimating an output signal from the mixer device and FIR-filtering the decimated signal.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application claims the priority of Korean Patent Application Nos. 10-2009-0127539 filed on Dec. 18, 2009 and 10-2010-0115078 filed on Nov. 18, 2010, in the Korean Intellectual Property Office, the disclosures of which are incorporated herein by reference.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to a direct conversion receiver and, more particularly, to a discrete-time direct conversion receiver having excellent adaptability and applied to a wireless communication terminal.[0004]2. Description of the Related Art[0005]In general, a charge sampling receiver includes a sampler performing frequency down-conversion and signal sampling. The sampler performs signal sampling by using voltage sampling or charge sampling.[0006]A charge sampling mixer has aliasing and noise folding elimination characteristics installed therein, having an excellent effect as a sampler compared with a voltage sa...

Claims

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Application Information

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IPC IPC(8): H03K9/00
CPCH03H19/004H04L25/08H03D7/1458H03D7/1441
Inventor PARK, JUNG WOOLEE, YOUNG JAEYU, HYUN KYUMIN, BYUNG HUNKIM, SEONG DONGUYEN, HOAI NAMLEE, SANG GUG
Owner ELECTRONICS & TELECOMM RES INST