Title:
A TWO-POINT MODULATION TRANSMITTER CALIBRATION CIRCUIT AND CALIBRATION METHOD
Document Type and Number:
WIPO Patent Application WO/2018/072449
Kind Code:
A1
Abstract:
The present invention relates to a two-point modulation transmitter calibration circuit and a calibration method. The circuit comprises: a two-point modulation phase locked loop system, a signal input circuit, a power amplifier and a gain automatic calibration circuit. The steps of the method comprise: after a phase locked loop is locked at an operating frequency, emitting calibration data, using a low-pass branch as a reference, calculating a gain difference of high-pass and low-pass paths by means of the gain automatic calibration circuit, and using special calibration timing to differentially adjust a control word of a low-pass filter, changing the output amplitude of a digital-to-analog converter to realize gain matching of two branches, and completing a calibration process by configuring a delay control word. In the present invention, a delay-matched calibration can be achieved, a gain automatic calibration function is included, the frequency deviation problem caused by high resource consumption of traditional two-point modulation frequency offset calibration, long calibration time, and a large temperature change is also solved.
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Inventors:
ZHAO HUI (CN)
HE GUOJUN (CN)
ZENG JUN (CN)
HE GUOJUN (CN)
ZENG JUN (CN)
Application Number:
PCT/CN2017/086850
Publication Date:
April 26, 2018
Filing Date:
June 01, 2017
Export Citation:
Assignee:
NATIONZ TECHNOLOGIES INC (CN)
International Classes:
H03L7/099
Foreign References:
| CN101777873A | 2010-07-14 | |||
| CN103427839A | 2013-12-04 | |||
| CN103178840A | 2013-06-26 |
Other References:
LEE, S. ET AL.: "Self-Calibrated Two-Point Delta-Sigma Modulation Technique for RF Transmitters", IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, vol. 58, no. 7, 7 June 2010 (2010-06-07), pages 1748 - 1757, XP055477716, ISSN: 0018-9480, Retrieved from the Internet
Attorney, Agent or Firm:
BEIJING LAWSING IP FIRM (CN)
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