Oscillation signal provider, in-phase and orthogonal oscillation signal provider and signal processing method
A technology of oscillating signals and quadrature oscillations, applied in digital transmission systems, electrical components, transmission systems, etc., can solve problems such as the impact of oscillation stability
Inactive Publication Date: 2013-12-04
MSTAR SOFTWARE R&D (SHENZHEN) LTD +1
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Problems solved by technology
exist figure 1 Among them, the oscillation frequency (2w) of the VCO 36 is exactly the same as one of the resonant frequencies output by the power amplifier 26, so as long as the high-power radio frequency signal output by the power amplifier 26 leaks slightly, the leaked energy will become Interfering signals (spurious) reach the VCO 36 through the electromagnetic coupling effect in the antenna 30 or the transceiver 100, and have a pulling effect on the phase of the VCO 36, affecting its oscillation stability
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[0041] Figure 2A A transceiver according to the present invention is shown, including a transmitter 12 and a frequency synthesizer 14 a . Frequency Synthesizer 14 a There is an oscillating signal provider 60 in the middle, which is used to provide two radio frequency signals S which are orthogonal to each other I with S Q , respectively given to the two mixers 24 in the transmitter 12. Figure 2A The oscillating signal provider 60 in the figure 1 The oscillating signal provider 35 in is used as an embodiment of the present invention. For the convenience of explanation, the following in-phase RF signal S I and quadrature RF signal S Q Represented by cos(wt) and cos(wt+π / 2) respectively, it also means that the orthogonal radio frequency signal S Q trailing in-phase RF signal S I There are π / 2 radians. In this specification, if the A signal lags the B signal by X radians, it also means that the phase of the A signal lags the phase of the B signal by X*180 / π degrees. T...
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The invention relates to an oscillation signal provider which comprises an orthogonal voltage controlled oscillator, a phase corrector and a frequency adjusting circuit. The orthogonal voltage controlled oscillator provides a plurality of oscillation signals with different phases. The phase corrector selects a first oscillation signal from the oscillation signals, outputs the first oscillation signal through a first output end, selects a second oscillation signal from the oscillation signals, and outputs the second oscillation signal through a second output end. The phase difference between the first oscillation signal and the second oscillation signal accords with a preset relation. The frequency adjusting circuit is connected to the phase corrector in a coupling mode and generates an orthogonal signal and an in-phase signal according to the oscillation signals. The frequency of the oscillation signals is non-integer times of the frequency of the in-phase signal and the orthogonal signal.
Description
technical field [0001] The present invention relates generally to wireless communications, and more particularly to methods and techniques for alleviating a voltage-controlled oscillator from frequency pulling. Background technique [0002] In wireless communication, the signal to be transmitted is basically initially generated in a relatively low frequency signal, which is generally called a baseband frequency. Afterwards, after some processing, the baseband signal is incidentally transmitted in a relatively high frequency radio frequency (radio frequency) signal. Such a process is generally called up-conversion, which is performed by the transmitter in the radio transceiver (RF transceiver); while the opposite process is called down-conversion, Executed by the receiver in the radio transceiver. Both up-conversion and down-conversion require phase-accurate local oscillation signals (referred to as LO signals), and the LO signal can be stabilized by a voltage controlled os...
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Login to View More IPC IPC(8): H04B1/40H04L27/152
Inventor 丁建裕
Owner MSTAR SOFTWARE R&D (SHENZHEN) LTD