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公开(公告)号：FR2781948A1
公开(公告)日：2000-02-04
申请号：FR9809800
申请日：1998-07-28
Applicant: ST MICROELECTRONICS SA
Inventor： MIQUEL REGIS , GARCIA PATRICE
Abstract: The device uses two mixer channels with local oscillator signals in quadrature and at a frequency chosen to produce a low, rather than zero, IF such as 100 kHz. After low pass filtering and gain control, the resulting I and Q signals are digitized and conventionally down converted by a second LO at IF and signal processor (20) including a complex mixer. The receiver comprises a first analogue mixer (4) combining a received signal (V3) with the signal from a local oscillator (6') at a first conversion frequency. A second analogue mixer (5) combines the input signal with that from the local oscillator phase shifted by 90 degrees. Each mixer defines a channel which is destined to be the object of analogue-digital conversion (11,12). On the digital side the receiver also comprises a device for detecting possible phase and gain imbalances between the two channels (I,Q). The first conversion frequency corresponds to the central frequency of the received channel, increased by half the frequency band of the channel.
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公开(公告)号：FR2781948B1
公开(公告)日：2001-02-09
申请号：FR9809800
申请日：1998-07-28
Applicant: ST MICROELECTRONICS SA
Inventor： MIQUEL REGIS , GARCIA PATRICE
Abstract: The present invention relates to a frequency conversion receiver at low intermediary frequency including a first analog mixer of a received signal with a signal coming from a local oscillator at a first conversion frequency and a second analog mixer of the incoming signal with the signal coming from the local oscillator out of phase by 90°. The receiver further includes, on the digital side, circuitry for detecting a possible phase difference and a possible gain difference between the signals of the two paths, the first conversion frequency corresponding to the central frequency of the received channel, plus half the channel frequency band.
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