Title:
TRANSMITTER, LOCAL OSCILLATOR CALIBRATION CIRCUIT, AND CALIBRATION METHOD
Document Type and Number:
WIPO Patent Application WO/2019/237260
Kind Code:
A1
Abstract:
The embodiments of the present application provide a transmitter, a local oscillator calibration circuit and a calibration method, for improving the performance of a transmitter. The transmitter comprises: a baseband signal path, configured to generate an analog baseband signal; a local oscillator signal path, comprising: a first buffer, configured to acquire a first oscillator signal, and calibrate a duty ratio of the first oscillator signal according to a differential voltage signal, to obtain a second oscillator signal; a local oscillator calibration circuit, comprising: a second buffer and a voltage dividing bias circuit, the second buffer being configured to generate a static point adjustment signal according to a self-bias voltage, and use the static point adjustment signal to adjust the current of the voltage dividing bias circuit, so as to generate a differential voltage signal, the static working point of the second buffer matching the static working point of the first buffer, a common mode voltage signal corresponding to the differential voltage signal being used to track the static point adjustment signal; and a frequency dividing circuit, configured to perform frequency division on the second oscillator signal, to obtain a local oscillator signal; and a mixer, configured to up-convert the analog baseband signal using the local oscillator signal, so as to generate a radio frequency signal.
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Inventors:
YU XIAOBAO (CN)
LIANG JIAN (CN)
ZHU NIANYONG (CN)
LIANG JIAN (CN)
ZHU NIANYONG (CN)
Application Number:
PCT/CN2018/090904
Publication Date:
December 19, 2019
Filing Date:
June 12, 2018
Export Citation:
Assignee:
HUAWEI TECH CO LTD (CN)
International Classes:
H04B1/04; H03B19/00; H03D7/16
Foreign References:
| CN107437959A | 2017-12-05 | |||
| CN105007044A | 2015-10-28 | |||
| CN104052407A | 2014-09-17 | |||
| CN105409118A | 2016-03-16 | |||
| US20170302308A1 | 2017-10-19 |
Other References:
INGELS, M. ET AL.: "A Multiband 40nm CMOS LTE SAW-Less Modultor with -60dBc C-IM3", 2013 IEEE INTENATIONAL SOLID-STATE CIRCUITS CONFERENCE, 20 February 2013 (2013-02-20), pages 338 - 339, XP032350597, DOI: 10.1109/ISSCC.2013.6487760
Attorney, Agent or Firm:
BEIJING ZBSD PATENT&TRADEMARK AGENT LTD. (CN)
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