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Method and system for transmitter envelope delay calibration

一种发射机、延迟调节的技术，应用在RF发射机领域，能够解决延迟不匹配、增加相邻信道功率等问题

Inactive Publication Date: 2009-03-04
NOKIA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As mentioned above, delay mismatch increases adjacent channel power

Method used

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  • Method and system for transmitter envelope delay calibration
  • Method and system for transmitter envelope delay calibration
  • Method and system for transmitter envelope delay calibration

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Embodiment Construction

[0022] As shown in Figure 1a, delay blocks are deployed into the phase component path to compensate for longer propagation delays in the envelope path. The present invention provides a method and system for determining an accurate delay compensation value for a delay block. An exemplary system for determining delay compensation values ​​for delay blocks is shown in FIG. 2 .

[0023] As shown in FIG. 2 , the 8PSK modulated I and Q digital baseband data is provided to the IQ-polar converter 110 using the EDGE modulation module 100 where the EDGE modulated signal is divided into AM components 112 and PM component 114. The AM components 112 are passed in the envelope path to a digital-to-analog converter (DAC) 160 where the digital AM components are converted to analog AM components 162 . After conversion by switched mode power supply (SMPS) 170, low pass filter 180 filters the amplified AM component 172 such that an envelope signal 182 representing the AM component is passed to...

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Abstract

A test signal comprising a periodic waveform, such as a triangular waveform and sawtooth waveform, is used for propagation delay matching in a transceiver front-end. The test signal is separately fed to the envelope path and the RF path. At the power amplifier stage, a phase modulator is used to obtain the envelope signal and the phase modulated RF signal for demodulation by an IQ demodulator. At the output end of the IQ demodulator, the I-signal is measured while the delay block is adjusted in order to vary the propagation delay. When the propagation delay matching is correct, the peak-to-peak value of the I-signal is a minimum. Preferably, during calibration using the test signal, the transmitter RF power amplifier is disabled so that no spurious signals will be sent. The transmitter can be an EDGE polar transmitter, a non-EDGE transmitter or a EER polar transmitter.

Description

technical field [0001] The present invention relates generally to RF transmitters and, more particularly, to adjusting the difference in path delay between envelope paths and RF paths in polarized transmitters. Background technique [0002] Traditionally, a direct upconversion transmitter has at least an I / Q modulator, an RF mixer, a filter, and a power amplifier. I / Q modulators are an efficient way to generate phase modulated signals. It generates a single complex waveform based on two signals in quadrature, I (in-phase) and Q (quadrature). In a direct upconversion transmitter, an I / Q modulator converts the spectrum of each quadrature input signal to the RF carrier frequency. As such, two digital-to-analog (D / A) converters are required to convert digital baseband to analog baseband. [0003] In recent years, other forms of transmitters have gained the attention of the RF R&D community: the use of high frequency, nonlinear power amplifiers (including C, D, E, F, and satur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03C5/00H04L27/36H03F1/02H03M1/66
CPCH03F2200/336H03F2200/504H03C5/00H04L27/364H03F1/0205H03F2200/102H03F1/0261H04L27/361H03F3/24H03F2200/351H04B1/04
Inventor J·玛特罗
Owner NOKIA CORP
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