Apparatus and method for downward mixing an input signal into an output signal
First Claim
1. A device for downward mixing an input signal into an output signal, comprising:
- a generator for generating a first receive signal and a second receive signal on a first intermediate frequency, wherein the generator for generating is implemented in order to generate the first receive signal and the second receive signal with a predetermined first phase relation to each other;
a converter for analog/digital converting the first receive signal on the first intermediate frequency in order to obtain a digital representation of the first receive signal and for analog/digital converting the second receive signal in order to obtain a digital representation of the second receive signal;
a phase detector for detecting a phase difference between the digital representation of the first receive signal and the digital representation of the second receive signal;
a first mixer for converting the digital representation of the first receive signal onto a second intermediate frequency;
a second mixer for converting the digital representation of the second receive signal onto the second intermediate frequency;
a mixer controller for controlling the first mixer with a first control signal comprising a first frequency and for controlling the second mixer with a second control signal comprising the first frequency, wherein the first and the second control signal comprise a predetermined first phase difference;
a summator for summing the output signals of the first mixer and the second mixer;
wherein the phase detector is implemented in order to control the generator for generating in order to reduce a mismatch between the digital representation of the first receive signal and the digital representation of the second receive signal and to control the mixer controller in order to digitally compensate a remaining mismatch between the digital representation of the first receive signal and the digital representation of the second receive signal so that the output signals of the first mixer and the second mixer are in a predetermined phase relation to each other, so that an image frequency rejection occurs.
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Abstract
Device for downward mixing an input signal into an output signal includes means for generating a first receive signal and a second receive signal on a first intermediate frequency, a converter means for analog/digital converting the first and the second receive signals on the first intermediate frequency, a phase detection means for detecting a phase difference between a digital representation of the first receive signal and the second receive signal, a first mixer means and a second mixer means for converting the respective digital representations onto a second intermediate frequency, a mixer control means and a summation means, wherein the phase detection means is implemented in order to control means for generating and/or mixer control means so that the output signals of the first and the second mixer means are in a predetermined phase relation to each other, so that an image frequency rejection occurs after a summation. By this it is achieved that the device for downward mixing is basically integrable and that an efficient image frequency rejection is obtained.
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Citations
17 Claims
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1. A device for downward mixing an input signal into an output signal, comprising:
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a generator for generating a first receive signal and a second receive signal on a first intermediate frequency, wherein the generator for generating is implemented in order to generate the first receive signal and the second receive signal with a predetermined first phase relation to each other;
a converter for analog/digital converting the first receive signal on the first intermediate frequency in order to obtain a digital representation of the first receive signal and for analog/digital converting the second receive signal in order to obtain a digital representation of the second receive signal;
a phase detector for detecting a phase difference between the digital representation of the first receive signal and the digital representation of the second receive signal;
a first mixer for converting the digital representation of the first receive signal onto a second intermediate frequency;
a second mixer for converting the digital representation of the second receive signal onto the second intermediate frequency;
a mixer controller for controlling the first mixer with a first control signal comprising a first frequency and for controlling the second mixer with a second control signal comprising the first frequency, wherein the first and the second control signal comprise a predetermined first phase difference;
a summator for summing the output signals of the first mixer and the second mixer;
wherein the phase detector is implemented in order to control the generator for generating in order to reduce a mismatch between the digital representation of the first receive signal and the digital representation of the second receive signal and to control the mixer controller in order to digitally compensate a remaining mismatch between the digital representation of the first receive signal and the digital representation of the second receive signal so that the output signals of the first mixer and the second mixer are in a predetermined phase relation to each other, so that an image frequency rejection occurs. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method for downward mixing an input signal into an output signal, comprising:
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generating a first receive signal and a second receive signal on a first intermediate frequency;
generating a predetermined first phase relation between the first receive signal and the second receive signal;
analog/digital converting the first receive signal on the first intermediate frequency in order to obtain a digital representation of the first receive signal, and analog/digital converting the second receive signal on the first intermediate frequency in order to obtain a digital representation of the second receive signal;
detecting a phase difference between the digital representation of the first receive signal and the digital representation of the second receive signal;
changing a phase relation between the first receive signal and the second receive signal in order to reduce a mismatch between the digital representation of the first receive signal and the digital representation of the second receive signal;
generating a first control signal and a second control signal for converting the digital representation of the first receive signal and the digital representation of the second receive signal to a second intermediate frequency;
generating a predetermined phase difference between the first and the second control signal in order to digitally compensate for a remaining mismatch between the digital representation of the first receive signal and the digital representation of the second receive signal in the conversion to the second intermediate frequency;
converting the digital representation of the first receive signal and the digital representation of the second receive signal to the second intermediate frequency, so that the converted digital representation of the first receive signal and the converted digital representation of the second receive signal are in a predetermined phase relation to each other;
summing the converted digital representation of the first and the second receive signal so that an image frequency rejection occurs based on the predetermined phase relation.
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17. A computer program having a program code for performing the method for downward mixing an input signal into an output signal, comprising:
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generating a first receive signal and a second receive signal on a first intermediate frequency;
generating a predetermined first phase relation between the first receive signal and the second receive signal;
analog/digital converting the first receive signal on the first intermediate frequency in order to obtain a digital representation of the first receive signal, and analog/digital converting the second receive signal on the first intermediate frequency in order to obtain a digital representation of the second receive signal;
detecting a phase difference between the digital representation of the first receive signal and the digital representation of the second receive signal;
changing a phase relation between the first receive signal and the second receive signal in order to reduce a mismatch between the digital representation of the first receive signal and the digital representation of the second receive signal;
generating a first control signal and a second control signal for converting the digital representation of the first receive signal and the digital representation of the second receive signal to a second intermediate frequency;
generating a predetermined phase difference between the first and the second control signal in order to digitally compensate for a remaining mismatch between the digital representation of the first receive signal and the digital representation of the second receive signal in the conversion to the second intermediate frequency;
converting the digital representation of the first receive signal and the digital representation of the second receive signal to the second intermediate frequency, so that the converted digital representation of the first receive signal and the converted digital representation of the second receive signal are in a predetermined phase relation to each other;
summing the converted digital representation of the first and the second receive signal so that an image frequency rejection occurs based on the predetermined phase relation;
when the computer program runs on a computer.
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Specification