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Method for calibrating mismatched modem

A technology of modem and calibration method, which is applied in the direction of modulated carrier system, receiver monitoring, transmission monitoring, etc., and can solve the problem of quadrature phase amplitude mismatch of the transmitter, etc.

Active Publication Date: 2014-06-04
ESPRESSIF SYST SHANGHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] Transmitter quadrature phase amplitude mismatch;

Method used

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  • Method for calibrating mismatched modem
  • Method for calibrating mismatched modem
  • Method for calibrating mismatched modem

Examples

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Embodiment Construction

[0056] The calibration device and method for modem mismatch of the present invention are especially suitable for the situation that a receiver and a transmitter are arranged on the modem chip at the same time, and the four quadrature phase amplitudes and phases of the receiver and the transmitter This mismatch is calibrated.

[0057] see figure 1 As shown, the calibration device includes an attenuation network and two phase-shifting networks added in the transmitter and receiver of the modem; wherein, the attenuation network feeds back the signal output of the transmitter of the modem to the modem The signal input end of the receiver; the two phase-shifting networks are respectively set on the lines corresponding to the clock generator providing local oscillation signals to the receiver and the transmitter.

[0058] Specifically, in the transmitter part of the modem, according to the direction of the transmitted signal, a module for transmitting digital baseband signals, a D / ...

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Abstract

The invention relates to a device and method for calibrating a mismatched modem. In the method, a signal output end of an emitter of the modem is connected to a signal input end of a receiver of the model in a feedback manner through an attenuation network, and I / O (Cosine / Sine) orthogonal signals required for modulating and demodulating a phase-shift network are respectively set on a circuit by which a clock generator corresponding provides local oscillation signals to the receiver and the emitter; and emitting-end output signals subjected to I / Q orthogonal modulation are respectively fed back and input to two paths of baseband signals subjected to the I / Q orthogonal modulation at the receiver, and the received signals are subjected to algebraic operation so as to realize measurement and compensation on the phase and the amplitude offset of an emitting end and a receiving end. According to the invention, a circuit for the model is unnecessary to establish and power consumption is unnecessary to increase, not only can the influence of an offset be eliminated, but also the data transmission rate of the model is increased, and the power consumption of the circuit is reduced; in addition, the interference signal intensity can be assisted to be reduced for the model, and the image-frequency rejection ratio can also be increased.

Description

technical field [0001] The invention relates to an integrated circuit, in particular to a modem mismatch calibration device and method. Background technique [0002] Currently, due to process tolerance, the CMOS modem on the signal path may have a mismatch phenomenon, thereby affecting the performance of the modem. [0003] Especially when the mismatch occurs in the quadrature path of the baseband portion of the modem, such as the baseband filters, baseband D / A and A / D converters, upconverting mixers, downconverting mixers, and controlled mixers quarter clock signal of the device. These mismatches cause signal distortion, causing signals at one frequency to be copied to other frequencies. [0004] For example, when the quadrature baseband signal is 10MHz, a 1GHz local oscillator is used for up-conversion through a double quadrature mixer, and the output signal should be a 1.01GHz single-frequency signal. [0005] However, due to the mismatch, a spurious signal at 990MHz i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/00H04B17/00H04B17/11H04B17/21
Inventor 张瑞安
Owner ESPRESSIF SYST SHANGHAI
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