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Local oscillation leakage detection circuit in radio-frequency transmitting and receiving circuit

A radio frequency transceiver circuit, local oscillator leakage technology, applied in electrical components, transmitter monitoring, receiver monitoring and other directions, can solve the problems of complex detection process, low detection accuracy of local oscillator leakage signal, time-consuming and labor-intensive, etc., to improve integration efficiency, reducing power consumption and cost, and high power consumption

Pending Publication Date: 2019-03-01
NO 54 INST OF CHINA ELECTRONICS SCI & TECH GRP
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Problems solved by technology

However, the local oscillator leakage signal used for calibration in the calibration process has the problems of low detection accuracy, complicated detection process, and time-consuming and laborious problems.

Method used

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  • Local oscillation leakage detection circuit in radio-frequency transmitting and receiving circuit
  • Local oscillation leakage detection circuit in radio-frequency transmitting and receiving circuit
  • Local oscillation leakage detection circuit in radio-frequency transmitting and receiving circuit

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Embodiment Construction

[0025] In order to make it easier for those skilled in the art to understand the technical solution of this patent, and at the same time, in order to make the technical purpose, technical solution and beneficial effect of this patent clearer, and to fully support the protection scope of the claims, the following is a specific case in the form of this patent. The technical solution of the patent makes further and more detailed descriptions.

[0026] A local oscillator leakage detection circuit in a radio frequency transceiver circuit, which is used to suppress the local oscillator leakage of a pair of input differential signals, and output a pair of calibrated differential output signals, including an active double-balanced frequency mixer circuit, a fully differential common A mode feedback circuit, an enable control circuit, two first adjustable resistance circuits, two common source amplifier tubes and two output switch tubes;

[0027] The active double-balanced frequency mi...

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Abstract

The invention discloses a local oscillation leakage detection circuit in a radio-frequency transmitting and receiving circuit, and belongs to the technical field of analog radio-frequency integrated circuits. The circuit in the invention comprises a source double-balanced mixing circuit, a fully differential common-mode feedback circuit, an enabling control circuit, two first adjustable resistancecircuits, two common-source amplifier tubes and two output end switch tubes. The local oscillation leakage detection circuit in the radio-frequency transmitting and receiving circuit in the inventioncan be integrated in a radio-frequency transceiver, and can effectively detect the size of a leakage signal.

Description

technical field [0001] The invention belongs to the technical field of analog radio frequency integrated circuits, in particular to a local oscillator leakage detection circuit in a radio frequency transceiver circuit. Background technique [0002] Due to the simple structure and low power consumption of the zero-IF transceiver, more and more modern wireless RF transceiver front-ends adopt this architecture, which is conducive to chip integration. However, the local oscillator spurs generated by the local oscillator leakage at the output end are relatively close to the signal after mixing, and the external filter cannot filter out the spurs. If the spurs are high, it will seriously affect the spectral purity of the output signal. The modulation accuracy is greatly reduced, and the carrier-to-noise ratio and EVM value are all reduced accordingly. [0003] There are two main reasons for the leakage of the local oscillator: first, in the up-conversion circuit, the DC signal ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B17/10H04B17/18H04B17/14H04B17/21H04B1/525
CPCH04B1/525H04B17/104H04B17/14H04B17/18H04B17/21
Inventor 陈明辉魏伟曲明王旭东吴迪
Owner NO 54 INST OF CHINA ELECTRONICS SCI & TECH GRP
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