Direct quadrature up-conversion transceiver and estimation method of local oscillator leakage of transmitter thereof
A transceiver and local oscillator leakage technology, applied in the field of communication, can solve the problems of inability to accurately estimate the local oscillator leakage value, local oscillator leakage, etc., and achieve the effect of improving test efficiency, reducing complexity, and accurate local oscillator leakage value
Inactive Publication Date: 2014-03-12
SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI
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[0006] In order to overcome the problem that the direct quadrature up-conversion technology of the above-mentioned prior art has local oscillator leakage and cannot accurately estimate its local oscillator leakage value, the main purpose of the present invention is to provide a direct quadrature up-conversion transceiver and its transmitter The evaluation method of local oscillator leakage, which can more accurately obtain the local oscillator leakage value contained in the RF signal after the up-conversion
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[0028] The embodiments of the present invention will be described below through specific examples and in conjunction with the accompanying drawings, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific examples, and various details in this specification can also be modified and changed based on different viewpoints and applications without departing from the spirit of the present invention.
[0029] figure 2 It is a structural block diagram of a preferred embodiment of the direct quadrature up-conversion transceiver of the present invention. In this specific embodiment, the transceiver includes a transmitter 21 and a receiver 22, the transmitter 21 includes a digital-to-analog converter, a filter, a variable gain amplifier VGA1, a mixer, an adder, and a variable gain amplifier VGA2, It...
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The invention provides a direct quadrature up-conversion transceiver and an estimation method of local oscillator leakage of a transmitter thereof. The estimation method comprises the following steps of: monitoring the current working state of the transceiver; when the current working state is a no-signal receiving state, grounding the LNA (low-noise amplifier) input, and performing direct current estimation on a digital end to obtain the direct current value introduced after a mixer in the down-conversion process; when the current working state is a receiving / transmitting link loopback state, short-circuiting the LNA input and output, and performing direct current estimation on the digital end to obtain the sum of the direct current value introduced by the local oscillator leakage of the transmitting end of the transmitter and the direct current value introduced after the mixer in the down-conversion process of the receiving end; and calculating the estimated value of local oscillator leakage of the transmitter by use of a local oscillator leakage estimation calculation model. Through the invention, the local oscillator leakage can be estimated by use of the existing resources, and a relatively accurate local oscillator leakage value can be obtained.
Description
technical field [0001] The invention relates to a wireless transceiver and an evaluation method for local oscillator leakage, in particular to a direct quadrature up-conversion transceiver and an evaluation method for the local oscillator leakage of its transmitter, belonging to the technical field of communications. Background technique [0002] The architecture of wireless transmitters has been dominated by superheterodyne for a long time. The superheterodyne transmitter is based on analog devices to achieve double frequency up-conversion functions. However, since the image interference suppression filter and channel selection filter used in the superheterodyne structure are generally high-Q band-pass filters, they can generally only be implemented off-chip, thereby increasing the receiver’s performance. Cost and size, at present, it is difficult to integrate these two filters with other radio frequency circuits on one chip using the integrated circuit manufacturing proce...
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IPC IPC(8): H04L25/06H04L25/02
Inventor 张钊锋王超
Owner SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI