Transmission circuit, wireless communication apparatus and timing adjustment method for transmission circuit

Abstract

The invention provides a timing adjustment method of a wireless communication device. In a wireless communication device, the delay difference between two signal paths that are modulated and synthesized by paths having different delay amounts, such as an I signal and a Q signal of a quadrature modulation method, and an r signal and a θ signal of an EER method, is adjusted. , thereby improving the linearity of the transmitted signal. It has a DA converting circuit, a combining circuit, a distributing circuit, an AD converting circuit, an oscillating circuit, a first separating circuit and a comparing circuit, wherein the oscillating circuit controls its output according to the comparison result by the comparing circuit.

Description

technical field [0001] The present invention relates to a transceiver with a function of adjusting the timing of a transmission signal by means of a closed-loop feedback control, and in particular to a transmission timing adjustment of an r (amplitude) component and a θ (phase) component using an EER method Transceiver. Background technique [0002] In transmitters installed in base stations and terminals of wireless communication systems including mobile phones, a method has been developed that separates transmission signals into two systems, processes them separately, synthesizes them again, and transmits the output. As such a method, for example, a method of separating and processing a transmission signal into an I signal and a Q signal, or an EER (Envelope Elimination and Restoration) method of separating and processing a transmission signal into an r (amplitude) component and a θ (phase) component are known. [0003] However, in the case of separating and processing th...

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Problems solved by technology

[0009] However, in general, the delay occurs in a minute unit of less than one clock, and it fluctuates in time due to external factors such as temperature changes.

[0016] if used Figure 8 In the method shown, it is also possible to adjust the delay that occurs in less than one clock unit, but there is such a problem, that is, because the adjustment amount is discontinuous, on the basis of residual quantization error in the adjustment amount, Affected by the group delay characteristic of the filter, the amount of delay varies with the frequency, deteriorating the signal quality

In addition, this is a function for matching the timing of the transmission signal and the feedback signal. Since it does not have a function to adjust the delay difference between the two components of the transmission signal, it cannot solve the above-mentioned problems of the EER method.

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