WO2010087199A1 - ハーモニックリジェクションミキサ - Google Patents
ハーモニックリジェクションミキサ Download PDFInfo
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- WO2010087199A1 WO2010087199A1 PCT/JP2010/000554 JP2010000554W WO2010087199A1 WO 2010087199 A1 WO2010087199 A1 WO 2010087199A1 JP 2010000554 W JP2010000554 W JP 2010000554W WO 2010087199 A1 WO2010087199 A1 WO 2010087199A1
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- mixer
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- phase
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
- H03D7/00—Transference of modulation from one carrier to another, e.g. frequency-changing
- H03D7/16—Multiple-frequency-changing
- H03D7/165—Multiple-frequency-changing at least two frequency changers being located in different paths, e.g. in two paths with carriers in quadrature
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
- H03D2200/00—Indexing scheme relating to details of demodulation or transference of modulation from one carrier to another covered by H03D
- H03D2200/0041—Functional aspects of demodulators
- H03D2200/0086—Reduction or prevention of harmonic frequencies
Definitions
- the present invention relates to a technique for suppressing (harmonic rejection) an odd-order harmonic response of a mixer used in a high-frequency processing unit in a wireless communication system.
- TV tuners need to cover a wide reception band allocated to TV broadcast signals. For example, in Japan, it is necessary to support VHF (Very High Frequency) channels (100 MHz band, 200 MHz band) and UHF (Ultra High Frequency) channels (470 MHz to 770 MHz).
- VHF Very High Frequency
- UHF Ultra High Frequency
- the software defined radio needs to support a plurality of wireless systems that use different wireless bands.
- the desired frequency is caused by the nonlinearity of the mixer.
- a disturbance signal that has been frequency-converted to a frequency in the vicinity of the output of the received signal having the following is output (hereinafter, this disturbance signal is referred to as an odd-order harmonic response).
- TV tuners and software defined radios have a wide reception band, and signal amplitude when receiving a signal of a desired frequency and signal amplitudes other than the desired frequency component output due to the harmonic response
- the ratio becomes a predetermined value
- the reception sensitivity deteriorates. Therefore, a technique is known that suppresses the odd-order harmonic response by bringing the output waveform of the high-frequency component at the mixer output closer to a sine wave (see, for example, Non-Patent Document 1).
- FIG. 1 is a block diagram showing a conventional harmonic rejection mixer described in FIG. 26.6.3 of Non-Patent Document 1.
- a conventional harmonic rejection mixer 10 includes gm elements 1, 2, and 3, and mixers 4, 5, and 6, frequency-converts a signal input from an input terminal 11, and outputs it. Output from terminal 12.
- the gm elements 1, 2, and 3 convert the voltage input from the input terminal 11 into current.
- the mixers 4, 5, and 6 are driven using control signals 21, 22, and 23 as shown in FIG.
- the control signals 21, 22, and 23 are pulse trains having the same frequency, a Hi period (on period) ratio to one period (hereinafter referred to as a DUTY ratio) of 50%, and a phase shifted by 45 degrees. is there.
- the weighting of the amplitude is performed by the gm element arranged in each path, and the output signal of the mixer driven by the control signal whose phase is shifted by 45 degrees is added and synthesized.
- the output waveform of the high frequency component as shown in FIG. 3 is obtained. Since this output waveform approximates a sine wave, it is possible to suppress odd-order harmonic responses.
- Non-Patent Document 1 a technique for suppressing a harmonic response of a reception mixer used in a radio receiver by suppressing the output waveform to be a sine wave, and a transmission mixer used in an amplifier and a radio transmitter Techniques for suppressing generated harmonic distortion are known (see Patent Document 1 to Patent Document 6 and Non-Patent Document 2).
- FIG. 4 is a configuration diagram of the power amplifier described in FIG.
- the power amplifier 50 includes an amplifier circuit 51 and an amplifier circuit 52, amplifies signals input from the input terminal 61, the input terminal 62, and the input terminal 63 and outputs the amplified signal from the output terminal 64.
- the amplifier circuit 51 has an inverter configuration composed of PMOS (Positive channel Metal Metal Oxide Semiconductor) and NMOS (Negative channel Metal Metal Oxide Semiconductor).
- the PMOS gate terminal is connected to the input terminal 61 and the NMOS gate terminal is input. Connected to the terminal 62, the PMOS and NMOS are driven by independent input signals (input signal 55 and input signal 56).
- the amplifier circuit 52 has an inverter configuration composed of PMOS and NMOS, and the gate terminals of the PMOS and NMOS are connected to the input terminal 63. The PMOS and NMOS are driven by the same input signal (input signal 57). .
- FIG. 5 is a diagram showing input signals 55, 56, 57 to the power amplifier 50.
- the input signal 57 is a signal having a DUTY ratio of 50%, and is input to the amplifier circuit 52 via the input terminal 63.
- the input signal 55 is a signal that falls during the Hi period of the input signal 57 so that the operation time of the PMOS constituting the amplifier circuit 51 is less than 50% for one period. It is input to the PMOS constituting the amplifier circuit 51.
- the input signal 56 is a signal that rises during the Low period of the input signal 57 so that the operation time of the NMOS constituting the amplifier circuit 51 is less than 50% for one period, and is amplified via the input terminal 62. This is input to the NMOS constituting the circuit 51.
- the output output through the output terminal 64.
- the waveform of the signal (the signal obtained by adding the output signals of the amplifier circuit 51 and the amplifier circuit 52) can be made close to a sine wave.
- a conventional harmonic rejection mixer after branching an input signal, weights the amplitude by a gm element arranged in each path and adds the output signal of the mixer driven by a control signal whose phase is shifted by 45 degrees. By combining, the harmonic response is suppressed. Therefore, there is a problem that the gm element is increased and the circuit scale and the current consumption are increased by adopting a configuration in which the harmonic response is suppressed.
- the quadrature demodulator in order to adjust the output waveform in each of the I phase and the Q phase, more gm elements are required, and there is a problem that the circuit scale and current consumption increase.
- An object of the present invention is to provide a harmonic rejection mixer capable of suppressing a harmonic response while suppressing an increase in the number of gm elements.
- the harmonic rejection mixer of the present invention is a harmonic rejection mixer that first adjusts the waveform of an output signal by synthesizing outputs of a plurality of mixers connected in parallel to a subsequent stage of a plurality of gm elements.
- a plurality of gm elements that convert an I-phase gm element, a Q-phase gm element, and a shared gm element shared by the I-phase and the Q-phase,
- Each output of the element is branched into a plurality, and each of the plurality of mixers has a configuration in which a switching element is connected to each output branch destination of the plurality of gm elements, and the I
- the switching element connected to the branch destination of the output of the phase gm element and the Q phase gm element is controlled by a drive signal whose ON period ratio to one cycle is 50%, and the output of the shared gm element is
- the switching element connected to the tip is controlled by a drive signal having an on-period ratio of less than 50% for one cycle
- a harmonic rejection mixer can be configured.
- the harmonic rejection mixer of the present invention is configured such that, in any of the plurality of gm elements, the switching elements connected to the branch destinations of the output of the same gm element are mutually connected. It is configured to be controlled by a drive signal composed of a pulse train that does not turn on at the same time.
- a harmonic rejection mixer can be configured while suppressing an increase in the number of gm elements, and the harmonic response suppression effect can be improved.
- the harmonic rejection mixer of the present invention has a switching element connected to the branch destination of the output of the shared gm element having an ON period for one cycle. It is configured to be controlled by a drive signal having a ratio of 25%.
- a harmonic rejection mixer can be configured while suppressing an increase in the number of gm elements, and the harmonic response suppression effect can be improved.
- the harmonic rejection mixer of the present invention is a harmonic rejection mixer that adjusts the waveform of the output signal by synthesizing the outputs of a plurality of mixers connected in parallel to the subsequent stage of the plurality of gm elements.
- a plurality of gm elements that convert an I-phase gm element, a Q-phase gm element, and a shared gm element shared by the I-phase and the Q-phase,
- Each output of the element is branched into a plurality, and each of the plurality of mixers has a configuration in which a switching element is connected to each output branch destination of the plurality of gm elements, and the I
- the switching element connected to the branch destination of the output of each of the phase gm element, the Q phase gm element, and the shared gm element has a common value in which the ratio of the on period to one cycle is less than 50%.
- the Q-phase output switching element is turned on at least during a period in which the I-phase output switching element is turned off among
- a harmonic rejection mixer can be configured.
- the harmonic rejection mixer of the present invention fifthly, in addition to the fourth configuration, further includes a plurality of capacitors connected to the subsequent stage of the plurality of mixers, and the same gm is used in any of the plurality of gm elements.
- the switching elements connected to each of the output branch destinations of the elements are configured to be controlled by drive signals composed of pulse trains that are not simultaneously turned on.
- a harmonic rejection mixer can be configured while suppressing an increase in the number of gm elements, and the harmonic response suppression effect can be improved.
- the harmonic rejection mixer of the present invention includes, in addition to the fourth configuration or the fifth configuration, each of the I-phase gm element, the Q-phase gm element, and the shared gm element.
- the switching element connected to the output branch destination is configured to be controlled by a drive signal whose ratio of the on period to one cycle is 25%.
- a harmonic rejection mixer can be configured while suppressing an increase in the number of gm elements, and the harmonic response suppression effect can be improved.
- the drive signal group for controlling the switching element is composed of pulse trains having the same frequency and different phases.
- a harmonic rejection mixer can be configured while suppressing an increase in the number of gm elements, and the harmonic response suppression effect can be improved.
- the harmonic rejection mixer of the present invention has a configuration in which the plurality of gm elements perform amplitude weighting on an input signal.
- a harmonic rejection mixer can be configured while suppressing an increase in the number of gm elements, and the harmonic response suppression effect can be improved.
- the figure which shows the structure of the harmonic rejection mixer of nonpatent literature 1 The figure which shows the control signal waveform of a nonpatent literature 1 description The figure which shows the output signal waveform of a nonpatent literature 1
- the figure which shows the structure of the power amplifier of patent document 6 The figure which shows the input signal waveform to the power amplifier of patent document 6
- the figure which shows an example of the harmonic rejection mixer in Embodiment 1 The figure which shows the structural example of the mixer in Embodiment 1 to Embodiment 4.
- the figure which shows the waveform of the control signal in Embodiment 1 The figure which shows another example of the harmonic rejection mixer in Embodiment 1.
- FIG. The figure which shows the waveform of the control signal in Embodiment 1 The figure which shows an example of the harmonic rejection mixer in Embodiment 2.
- FIG. 10 is a diagram illustrating an example of a direct sampling mixer according to the fifth embodiment.
- the present embodiment relates to a configuration in which the number of gm elements used in a harmonic rejection mixer is reduced by using a control signal whose duty ratio (ratio of on period to one cycle) is other than 50%, particularly less than 50%.
- a control signal whose duty ratio (ratio of on period to one cycle) is other than 50%, particularly less than 50%.
- FIG. 6 is a block diagram showing a schematic configuration of the harmonic rejection mixer according to the first embodiment of the present invention.
- the harmonic rejection mixer 100 includes a gm element 101, a gm element 102, a mixer 103, a mixer 104, and a control signal generation unit 105, and a signal input from the input terminal 111 is a frequency.
- the output signal 123 is output from the output terminal 112 after conversion.
- the gm element 101 and the gm element 102 convert an alternating voltage input from the input terminal 111 into an alternating current.
- the mixer 103 is connected to the gm element 101 and is driven by a control signal 121 output from the control signal generator 105.
- the mixer 104 is connected to the gm element 102 and is driven by a control signal 122 output from the control signal generation unit 105.
- the mixer 103 and the mixer 104 are preferably NMOS switches shown in FIG. 7A, PMOS switches shown in FIG. 7B, or CMOS (ComplementaryCompMetal Oxide Semiconductor) switches using the PMOS and NMOS shown in FIG. 7C in a complementary manner.
- the passive mixer is configured and is driven by a control voltage and outputs an alternating current output from the gm element 101 or the gm element 102 to the output terminal 112 only during a period in which it is in an active state.
- FIG. 8 is a diagram illustrating time waveforms of the control signal 121, the control signal 122, and the output signal 123.
- the control signal 121 is a rectangular wave with a DUTY ratio of 50%.
- the control signal 122 is a rectangular wave with a DUTY ratio of 25%, and preferably has the same frequency as the control signal 121 and a phase difference of 45 degrees.
- the output signal 123 is obtained by adding the output signals of the mixer 103 and the mixer 104.
- An AC voltage signal input from the input terminal 111 is branched and input to the gm element 101 and the gm element 102.
- the gm element 101 outputs an alternating current corresponding to the gm 101 to the mixer 103.
- the mixer 103 is driven by the control signal 121 and performs frequency conversion processing on the alternating current output from the gm element 101 based on the frequency of the control signal 121, and only during the period when the control signal 121 is in the active state.
- the frequency-converted alternating current is output.
- the gm element 102 outputs an alternating current corresponding to the gm 102 to the mixer 104.
- the mixer 104 is driven by the control signal 122 and performs frequency conversion processing on the alternating current output from the gm element 102 based on the frequency of the control signal 122, and only during a period when the control signal 122 is active.
- the frequency-converted alternating current is output.
- a stepped voltage waveform shown in the output signal 123 can be taken out, and a half of the sine wave is obtained.
- An output waveform close to a repetitive waveform of a cycle can be output.
- a capacitive element such as a capacitor can be used as a load connected to the output terminal 112. In the case of using a capacitive element, it is possible to add a filter characteristic corresponding to the time for injecting current into the capacitive element.
- FIG. 9 is a block diagram showing another example of the schematic configuration of the harmonic rejection mixer according to the present embodiment.
- the harmonic rejection mixer 400 includes a gm element 401, a gm element 402, a mixer 403, a mixer 404, a mixer 405, a mixer 406, and a control signal generation unit 407.
- An input signal is frequency-converted, and an output signal 423 and an output signal 424 are output from the output terminal 412 and the output terminal 413.
- the gm element 401 and the gm element 402 convert an alternating voltage input from the input terminal 411 into an alternating current.
- the mixer 403 is connected to the gm element 401 and is driven by the control signal 121 output from the control signal generation unit 407.
- the mixer 404 is connected to the gm element 401 and is driven by a control signal 421 output from the control signal generation unit 407.
- the mixer 405 is connected to the gm element 402 and is driven by the control signal 122 output from the control signal generation unit 407.
- the mixer 406 is connected to the gm element 402 and is driven by a control signal 422 output from the control signal generation unit 407.
- the mixer 403, the mixer 404, the mixer 405, and the mixer 406 preferably use the NMOS switch shown in FIG. 7A, the PMOS switch shown in FIG. 7B, or the PMOS and NMOS shown in FIG. 7C in a complementary manner.
- This is a passive mixer composed of CMOS switches.
- Each of the mixers is driven by the control signal, and the alternating current output from the gm element 401 or the gm element 402 is output to the output terminal 412 and the output terminal 413 only during a period of being in an active state (on period). Output.
- FIG. 10 is a diagram illustrating time waveforms of the control signal 121, the control signal 122, the control signal 421, the control signal 422, the output signal 423, and the output signal 424.
- the control signal 121 and the control signal 122 have the same waveforms as those described with reference to FIG.
- the control signal 421 is a rectangular wave with a DUTY ratio of 50%.
- the control signal 422 is a rectangular wave with a DUTY ratio of 25%, and preferably has the same frequency as the control signal 421 and a phase difference of 45 degrees.
- the output signal 423 is obtained by adding the output signals of the mixer 403 and the mixer 405, and has the same waveform as the output signal 123 shown in FIG.
- the output signal 424 is obtained by adding the output signals of the mixer 404 and the mixer 406.
- the control signal 121 and the control signal 421, the control signal 122 and the control signal 422, the output signal 423 and the output signal 424 have the same frequency, and the phase difference between the signals is 180 degrees.
- An AC voltage signal input from the input terminal 411 is branched and input to the gm element 401 and the gm element 402.
- the gm element 401 outputs an alternating current corresponding to the gm 401 to the mixer 403 and the mixer 404.
- the mixer 403 is driven by the control signal 121 and performs frequency conversion processing on the alternating current output from the gm element 401 based on the frequency of the control signal 121, and only during the period when the control signal 121 is in the active state.
- the frequency-converted alternating current is output.
- the mixer 404 is driven by the control signal 421 and performs frequency conversion processing on the alternating current output from the gm element 401 based on the frequency of the control signal 421, and only during the period when the control signal 421 is in the active state.
- the frequency-converted alternating current is output.
- the gm element 402 outputs an alternating current corresponding to the gm 402 to the mixer 405 and the mixer 406.
- the mixer 405 is driven by the control signal 122 and performs frequency conversion processing on the alternating current output from the gm element 402 based on the frequency of the control signal 122, and only during the period when the control signal 122 is in the active state.
- the frequency-converted alternating current is output.
- the mixer 406 is driven by the control signal 422 and performs frequency conversion processing on the alternating current output from the gm element 402 based on the frequency of the control signal 422, and only during the period when the control signal 422 is in the active state.
- the frequency-converted alternating current is output.
- An output waveform close to a repetitive waveform of a cycle can be output.
- a current obtained by adding the output currents of the mixer 404 and the mixer 406 flows to the output terminal 413.
- a stepped voltage waveform shown in the output signal 424 can be taken out, and a sine wave It is possible to output an output waveform close to a repetitive waveform of a half cycle.
- a capacitive element such as a capacitor can be used as a load connected to the output terminals 412 and 413.
- the output signal 423 and the output signal 424 have the same frequency and the phase difference between the signals is 180 degrees
- the output signal 423 is used after the load by using a differential amplifier (not shown) or the like.
- a differential amplifier not shown
- the harmonic rejection mixer described in Non-Patent Document 1 requires three gm elements, whereas the harmonic rejection mixer described in the first embodiment of the present invention includes two gm elements. Since it is configured, the purpose of reducing the number of gm elements can be realized.
- the present embodiment a configuration has been described in which the number of gm elements used in a harmonic rejection mixer is reduced by combining a control signal having a DUTY ratio of 50% and a control signal having a DUTY ratio of 25%.
- the present invention is not limited to this.
- the DUTY ratio of a control signal having a duty ratio of less than 50% is set to N%
- the reference phase difference between the control signal having a duty ratio of 50% and the control signal having a duty ratio of N% is set to (180 ⁇ N / 100) degrees.
- the ratio of the gm of the gm element at the front stage of the mixer driven at a duty ratio of 50% and the gm of the gm element at the front stage of the mixer driven at a duty ratio of N% can be simulated as a sine wave by a rectangular wave.
- the number of gm elements used in the harmonic rejection mixer can be reduced.
- FIG. 11 is a block diagram showing a schematic configuration of a harmonic rejection mixer according to the second embodiment of the present invention.
- the harmonic rejection mixer 600 includes a gm element 601, a gm element 602, a mixer 603, a mixer 604, a mixer 605, a mixer 606, a mixer 607, a mixer 608, a mixer 609, a mixer 610, and a control signal.
- the gm element 601 and the gm element 602 convert the differential AC voltage input from the input terminal 611 into a differential AC current. Specifically, the gm element 601 and the gm element 602 output a differential AC current having a phase difference corresponding to the positive phase and the negative phase of the input differential AC voltage.
- the mixer 603 is connected to the positive phase output unit of the gm element 601 and is driven by the control signal 121 output from the control signal generation unit 407.
- the mixer 604 is connected to the positive phase output unit of the gm element 601 and is driven by the control signal 421 output from the control signal generation unit 407.
- the mixer 605 is connected to the negative phase output unit of the gm element 601 and is driven by the control signal 421 output from the control signal generation unit 407.
- the mixer 606 is connected to the negative phase output unit of the gm element 601 and is driven by the control signal 121 output from the control signal generation unit 407.
- the mixer 607 is connected to the positive phase output unit of the gm element 602 and is driven by the control signal 122 output from the control signal generation unit 407.
- the mixer 608 is connected to the positive phase output unit of the gm element 602 and is driven by the control signal 422 output from the control signal generation unit 407.
- the mixer 609 is connected to the negative phase output unit of the gm element 602 and is driven by the control signal 422 output from the control signal generation unit 407.
- the mixer 610 is connected to the negative phase output unit of the gm element 602 and is driven by the control signal 122 output from the control signal generation unit 407.
- the mixer 603, the mixer 604, the mixer 605, the mixer 606, the mixer 607, the mixer 608, the mixer 609, and the mixer 610 are preferably an NMOS switch shown in FIG. 7A, a PMOS switch shown in FIG. This is a passive mixer composed of CMOS switches using the PMOS and NMOS shown in 7C in a complementary manner.
- Each of the mixers is driven by a control signal and is in the active state (on period) only during the positive phase output unit or negative phase output unit of the gm element 601 or the positive phase output unit or negative phase of the gm element 602.
- the alternating current output from the output unit is output to the output terminal 612.
- FIG. 12 is a diagram showing time waveforms of the control signal 121, the control signal 122, the control signal 421, the control signal 422, the output signal 621, and the output signal 622.
- the control signal 121, the control signal 122, the control signal 421, and the control signal 422 have the same waveforms as those described with reference to FIGS.
- the output signal 621 is obtained by adding the output signals of the mixer 603, the mixer 605, the mixer 607, and the mixer 609.
- An output signal 622 is obtained by adding the output signals of the mixer 604, the mixer 606, the mixer 608, and the mixer 610.
- the output signal 621 and the output signal 622 have the same frequency, and the phase difference between the signals is 180 degrees.
- the differential AC voltage signal input from the input terminal 611 is branched and input to the gm element 601 and the gm element 602.
- the gm element 601 outputs a positive phase alternating current corresponding to the gm 601 to the mixer 603 and the mixer 604, and outputs a negative phase alternating current corresponding to the gm 601 to the mixer 605 and the mixer 606.
- the mixer 603 is driven by the control signal 121 and performs a frequency conversion process on the positive-phase alternating current output from the gm element 601 based on the frequency of the control signal 121 and is in an active state by the control signal 121. Only in the middle, frequency-converted alternating current is output.
- the mixer 604 is driven by the control signal 421, performs a frequency conversion process on the positive-phase AC current output from the gm element 601 based on the frequency of the control signal 421, and is in an active state by the control signal 421. Only in the middle, frequency-converted alternating current is output.
- the mixer 605 is driven by the control signal 421, performs a frequency conversion process on the negative-phase alternating current output from the gm element 601 based on the frequency of the control signal 421, and is in the active state by the control signal 421. Only in the middle, frequency-converted alternating current is output.
- the mixer 606 is driven by the control signal 121, performs a frequency conversion process on the negative phase alternating current output from the gm element 601 based on the frequency of the control signal 121, and is in an active state by the control signal 121. Only in the middle, the frequency-converted alternating current is output.
- the gm element 602 outputs a positive-phase AC current corresponding to the gm 602 to the mixer 607 and the mixer 608, and outputs a negative-phase AC current corresponding to the gm 602 to the mixer 609 and the mixer 610.
- the mixer 607 is driven by the control signal 122 and performs frequency conversion processing on the positive-phase alternating current output from the gm element 602 based on the frequency of the control signal 122 and is in an active state by the control signal 122. Only in the middle, frequency-converted alternating current is output.
- the mixer 608 is driven by the control signal 422, performs a frequency conversion process on the positive-phase alternating current output from the gm element 602 based on the frequency of the control signal 422, and is in the active state by the control signal 422. Only in the middle, frequency-converted alternating current is output.
- the mixer 609 is driven by the control signal 422, performs a frequency conversion process on the negative-phase alternating current output from the gm element 602 based on the frequency of the control signal 422, and is a period in which the control signal 422 enters an active state. Only in the middle, frequency-converted alternating current is output.
- the mixer 610 is driven by the control signal 122 and performs frequency conversion processing on the negative-phase alternating current output from the gm element 602 based on the frequency of the control signal 122 and is in an active state by the control signal 122. Only in the middle, frequency-converted alternating current is output.
- the output terminal 612 includes a positive phase current obtained by adding the output currents of the mixer 603, the mixer 605, the mixer 607, and the mixer 609, and a negative phase current obtained by adding the output currents of the mixer 604, the mixer 606, the mixer 608, and the mixer 610. Is output.
- the stepped voltage waveforms shown in the output signal 621 and the output signal 622 can be taken out, and an output waveform close to a one-cycle repetitive waveform of a sine wave is output. can do. In this way, the harmonic response can be suppressed.
- a capacitive element such as a capacitor can be used as a load connected to the output terminal 612.
- the harmonic rejection mixer 100 is a single-ended mixer
- the harmonic rejection mixer 400 is a single balance mixer
- the harmonic rejection mixer 600 is a double balance mixer. Therefore, based on Embodiment 1 and Embodiment 2, it is possible to change to another configuration by disclosing any one configuration. Therefore, in the following embodiments, only the single balance configuration will be described for the sake of simplicity.
- the present embodiment a configuration has been described in which the number of gm elements used in a harmonic rejection mixer is reduced by combining a control signal having a DUTY ratio of 50% and a control signal having a DUTY ratio of 25%.
- the present invention is not limited to this.
- the DUTY ratio of a control signal having a duty ratio of less than 50% is set to N%
- the reference phase difference between the control signal having a duty ratio of 50% and the control signal having a duty ratio of N% is set to (180 ⁇ N / 100) degrees.
- the ratio of the gm of the gm element at the front stage of the mixer driven at a duty ratio of 50% and the gm of the gm element at the front stage of the mixer driven at a duty ratio of N% can be simulated as a sine wave by a rectangular wave.
- the number of gm elements used in the harmonic rejection mixer can be reduced.
- a quadrature demodulator that generates an I-phase output and a Q-phase output having a phase difference of 90 degrees is configured using the harmonic rejection mixer 400 (FIG. 9) shown in the first embodiment.
- a description will be given of a configuration in which some mixers are driven using a control signal having a DUTY ratio of less than 50%, and a gm element is shared between the I phase and the Q phase using a period in which the mixer is inactive (off period). To do.
- FIG. 13 is a block diagram showing a schematic configuration of a harmonic rejection mixer according to the third embodiment of the present invention.
- the harmonic rejection mixer 800 includes an I-phase gm element 801, a shared gm element 802, a Q-phase gm element 803, a mixer 804, a mixer 805, a mixer 806, a mixer 807, a mixer 808, and a mixer. 809, a mixer 810, a mixer 811, and a control signal generation unit 812, frequency-convert the signal input from the input terminal 821, and output an I-phase positive-phase signal from the output terminal 822 and I from the output terminal 823.
- the negative phase signal of the phase is outputted from the output terminal 824, the positive phase signal of Q phase, and the negative phase signal of Q phase is outputted from the output terminal 825, respectively.
- the gm shared unit 840 includes a gm element 802, a mixer 806, a mixer 807, a mixer 808, and a mixer 809.
- the gm element 801, the gm element 802, and the gm element 803 convert an alternating voltage input from the input terminal 821 into an alternating current.
- the mixer 804 is connected to the gm element 801 and is driven by the control signal 831 output from the control signal generation unit 812.
- the mixer 805 is connected to the gm element 801 and is driven by a control signal 832 output from the control signal generation unit 812.
- the mixer 806 is connected to the gm element 802 and driven by a control signal 835 output from the control signal generation unit 812.
- the mixer 807 is connected to the gm element 802 and driven by a control signal 836 output from the control signal generation unit 812.
- the mixer 808 is connected to the gm element 802 and driven by a control signal 837 output from the control signal generation unit 812.
- the mixer 809 is connected to the gm element 802 and driven by a control signal 838 output from the control signal generation unit 812.
- the mixer 810 is connected to the gm element 803 and driven by a control signal 833 output from the control signal generation unit 812.
- the mixer 811 is connected to the gm element 803 and driven by a control signal 834 output from the control signal generation unit 812.
- the mixer 804, the mixer 805, the mixer 806, the mixer 807, the mixer 808, the mixer 809, the mixer 810, and the mixer 811 are preferably an NMOS switch shown in FIG. 7A, a PMOS switch shown in FIG. 7B, or FIG.
- the passive mixer is composed of CMOS switches using the PMOS and NMOS shown in FIG.
- Each of the mixers is driven by a control signal, and only during a period of being in an active state (on period), an alternating current output from the gm element 801, the gm element 802, or the gm element 803 is output as an output terminal 822, an output terminal. 823, the output terminal 824, or the output terminal 825.
- FIG. 14 is a diagram showing time waveforms of the control signals 831, 832, 833, 834, 835, 836, 837 and 838. These control signals have the same frequency, but differ in phase and DUTY ratio.
- the control signal 831, the control signal 832, the control signal 833, and the control signal 834 are rectangular waves with a DUTY ratio of 50%.
- the phase difference between the control signal 831 and the control signal 832 and the phase difference between the control signal 833 and the control signal 834 are 180 degrees. Further, the phase difference between the control signal 831 and the control signal 833 and the phase difference between the control signal 832 and the control signal 834 are 90 degrees.
- control signals 835, 836, 837, and 838 are rectangular waves having a DUTY ratio of 25%, and are each shifted in phase by 90 degrees. Further, the reference phase of the rectangular wave group having a DUTY ratio of 50% and the reference phase of the rectangular wave group having a DUTY ratio of 25% have a phase difference of 45 degrees.
- control signals 831, 832, 833, 833, 834, 835, 836, 837, and 838 have the same frequency and are synchronized.
- control signals 831 and 832, the control signal 833 and the control signal 834, the control signal 835, the control signal 836, the control signal 837, and the control signal 838 are set so that the mixers driven by the respective control signals do not become active at the same time. It is desirable to control. For example, when the DUTY ratio is 50% so that the time when each control signal becomes Hi (on period) does not overlap, the waveform of the actual control signal is shaped to be less than 50%, and the DUTY ratio is In the case of 25%, it is desirable to shape the waveform of the actual control signal so that it is less than 25%. Further, it is desirable to adjust the phase of the control signal with a DUTY of 50% and the control signal with a DUTY ratio of 25% so that the error from the pseudo sine wave does not increase with the waveform shaping of the control signal.
- the AC voltage signal input from the input terminal 821 is branched and input to the gm element 801, the gm element 802, and the gm element 803.
- the gm element 801 outputs an alternating current corresponding to the gm 801 to the mixer 804 and the mixer 805.
- the mixer 804 is driven by the control signal 831 and performs frequency conversion processing on the alternating current output from the gm element 801 based on the frequency of the control signal 831, and only during the period when the control signal 831 is in the active state.
- the frequency-converted alternating current is output to the output terminal 822.
- the mixer 805 is driven by the control signal 832 and performs frequency conversion processing on the alternating current output from the gm element 801 based on the frequency of the control signal 832, and only during the period when the control signal 832 is in the active state.
- the frequency-converted alternating current is output to the output terminal 823.
- the gm element 802 outputs an alternating current corresponding to the gm 802 to the mixer 806, the mixer 807, the mixer 808, and the mixer 809.
- the mixer 806 is driven by the control signal 835 and performs frequency conversion processing on the alternating current output from the gm element 802 based on the frequency of the control signal 835, and is in the active state by the control signal 835 (ON Only during the period), the frequency-converted alternating current is output to the output terminal 822.
- the mixer 807 is driven by the control signal 836 and performs frequency conversion processing on the alternating current output from the gm element 802 based on the frequency of the control signal 836, and only during the period when the control signal 836 is in the active state.
- the frequency-converted alternating current is output to the output terminal 823.
- the mixer 808 is driven by the control signal 837 and performs frequency conversion processing on the alternating current output from the gm element 802 based on the frequency of the control signal 837, and only during the period when the control signal 837 is in the active state.
- the frequency-converted alternating current is output to the output terminal 824.
- the mixer 809 is driven by the control signal 838 and performs frequency conversion processing on the alternating current output from the gm element 802 based on the frequency of the control signal 838, and only during the period when the control signal 838 is in the active state.
- the frequency-converted alternating current is output to the output terminal 825.
- the gm element 803 outputs an alternating current corresponding to the gm 803 to the mixer 810 and the mixer 811.
- the mixer 810 is driven by the control signal 833 and performs frequency conversion processing on the alternating current output from the gm element 803 based on the frequency of the control signal 833 and only during a period when the control signal 833 is in the active state.
- the frequency-converted alternating current is output to the output terminal 824.
- the mixer 811 is driven by the control signal 834 and performs frequency conversion processing on the alternating current output from the gm element 803 based on the frequency of the control signal 834, and only during the period when the control signal 834 is in the active state.
- the frequency-converted alternating current is output to the output terminal 825.
- the current obtained by adding the output currents of the mixer 804 and the mixer 806 flows to the output terminal 822 (I positive phase).
- a current obtained by adding the output currents of the mixer 805 and the mixer 807 flows through the output terminal 823 (I negative phase).
- a current obtained by adding the output currents of the mixer 808 and the mixer 810 flows to the output terminal 824 (Q positive phase).
- a current obtained by adding the output currents of the mixer 809 and the mixer 811 flows through the output terminal 825 (Q negative phase).
- a step-like output signal 423 and an output signal 424 as shown in FIG. 10 can be taken out.
- two stepped voltage waveforms having a phase difference of 90 degrees with respect to each of the output signal 423 and the output signal 424 can be extracted. it can.
- an I-phase output signal is obtained using the gm element 801 and the gm element 802 and the mixer 804, the mixer 805, the mixer 806, and the mixer 807. Further, a Q-phase output signal is obtained using the gm element 803 and the gm element 802 and the mixer 808, the mixer 809, the mixer 810, and the mixer 811.
- the gm element 802 can be shared between the I phase and the Q phase by using a control signal having a DUTY ratio of 25% for the gm sharing unit 840.
- the difference between the output signal of the output terminal 822 and the output signal of the output terminal 823 is obtained by using a differential amplifier (not shown) after the load. As shown in FIG. 10, a stepped output signal 425 close to a one-cycle repetitive waveform of a sine wave can be obtained. Similarly, by taking the difference between the output signal at the output terminal 824 and the output signal at the output terminal 825, an output signal having a 90-degree phase difference with respect to the output signal 425 can be obtained. In this way, the harmonic response can be suppressed while suppressing the number of gm elements to be used.
- a capacitive element such as a capacitor can be used as a load connected to the output terminals 822, 823, 824, and 825.
- the harmonic rejection mixer described in Non-Patent Document 1 requires three gm elements. If a quadrature demodulator is configured using the technique of Non-Patent Document 1, six gm elements are required. . On the other hand, according to the configuration of the present embodiment, since the quadrature demodulator can be configured using three gm elements, the number of gm elements can be reduced, and the circuit scale can be reduced. Furthermore, power consumption of the entire circuit can be suppressed.
- the configuration in which the number of gm elements used in the harmonic rejection mixer is reduced by combining a control signal having a DUTY ratio of 50% and a control signal having a DUTY ratio of 25% has been described.
- the combination of ratios is not limited to this.
- the DUTY ratio of a control signal having a duty ratio of less than 50% is set to N%
- the reference phase difference between the control signal having a duty ratio of 50% and the control signal having a duty ratio of N% is set to (180 ⁇ N / 100) degrees.
- the ratio of the gm of the gm element at the front stage of the mixer driven at a duty ratio of 50% and the gm of the gm element at the front stage of the mixer driven at a duty ratio of N% can be simulated as a sine wave by a rectangular wave.
- the number of gm elements used in the harmonic rejection mixer can be reduced.
- a quadrature demodulator that generates an I-phase output and a Q-phase output with a phase difference of 90 degrees is configured using a harmonic rejection mixer. Indicates.
- the third embodiment only some of the mixers are driven by using a control signal with a DUTY ratio of less than 50%. However, in this embodiment, all the mixers have a common value with a DUTY ratio of less than 50%. The difference is that the mixer is driven using a certain control signal. The point that the gm element is shared between the I phase and the Q phase using the period in which the mixer is inactive is the same as in the third embodiment.
- FIG. 15 is a block diagram showing a schematic configuration of the harmonic rejection mixer according to the present embodiment.
- the harmonic rejection mixer 1000 includes an I-phase gm element 801, a Q-phase gm element 803, a shared gm element 802, a mixer 806, a mixer 807, a mixer 808, and a mixer 809.
- the same components as those described in the third embodiment with reference to FIG. 13 are denoted by the same reference numerals as those in FIG.
- the gm element 801, the gm element 802, and the gm element 803 convert an alternating voltage input from the input terminal 821 into an alternating current.
- the mixer 1001 is connected to the gm element 801 and is driven by the control signal 1031 output from the control signal generation unit 1009.
- the mixer 1002 is connected to the gm element 801 and driven by a control signal 1032 output from the control signal generation unit 1009.
- the mixer 1003 is connected to the gm element 801 and driven by a control signal 1033 output from the control signal generation unit 1009.
- the mixer 1004 is connected to the gm element 801 and driven by the control signal 1034 output from the control signal generation unit 1009.
- the mixer 1005 is connected to the gm element 803 and driven by the control signal 1032 output from the control signal generation unit 1009.
- the mixer 1006 is connected to the gm element 803 and driven by a control signal 1033 output from the control signal generation unit 1009.
- the mixer 1007 is connected to the gm element 803 and driven by a control signal 1034 output from the control signal generation unit 1009.
- the mixer 1008 is connected to the gm element 803 and driven by a control signal 1031 output from the control signal generation unit 1009.
- the mixer 1001, the mixer 1002, the mixer 1003, the mixer 1004, the mixer 1005, the mixer 1006, the mixer 1007, and the mixer 1008 are preferably an NMOS switch shown in FIG. 7A, a PMOS switch shown in FIG. 7B, or FIG.
- the passive mixer is composed of CMOS switches using the PMOS and NMOS shown in FIG.
- Each of the mixers is driven by a control signal and outputs an alternating current output from the gm element 801 or the gm element 803 only during the active period (on period), as an output terminal 822, an output terminal 823, and an output terminal. 824 or output to the output terminal 825.
- FIG. 16 is a diagram showing time waveforms of the control signals 1031, 1032, 1033, 1034, 835, 836, 837, and 838. These control signals have the same frequency, have a common DUTY ratio, and differ only in phase.
- the control signals 835, 836, 837, and 838 input to the gm shared unit 840 are the same as those described in Embodiment 3 with reference to FIG.
- the control signals 1031, 1032, 1033, and 1034 are rectangular waves with a DUTY ratio of 25%, and are obtained by shifting the phase by 90 degrees.
- the reference phase of the control signals 1031, 1032, 1033, 1034 and the reference phase of the control signals 835, 836, 837, 838 have a phase difference of 45 degrees.
- control signals 1031, 1032, 1033, 1034, 835, 836, 837 and 838 have the same frequency and are synchronized.
- control signal 835, the control signal 836, the control signal 837, and the control signal 838 are controlled so that the mixers driven by the respective control signals are not simultaneously activated.
- the AC voltage signal input from the input terminal 821 is branched and input to the gm element 801, the gm element 802, and the gm element 803.
- the I-phase gm element 801 outputs an alternating current corresponding to the gm 801 to the mixer 1001, the mixer 1002, the mixer 1003, and the mixer 1004.
- the mixer 1001 is driven by the control signal 1031 and performs frequency conversion processing on the alternating current output from the gm element 801 based on the frequency of the control signal 1031, and only during the period when the control signal 1031 is in the active state.
- the frequency-converted alternating current is output to the output terminal 822.
- the mixer 1002 is driven by the control signal 1032 and performs frequency conversion processing on the alternating current output from the gm element 801 based on the frequency of the control signal 1032, and only during a period in which the control signal 1032 is in the active state.
- the frequency-converted alternating current is output to the output terminal 822.
- the mixer 1003 is driven by the control signal 1033 and performs frequency conversion processing on the alternating current output from the gm element 801 based on the frequency of the control signal 1033 and only during a period when the control signal 1033 is in the active state.
- the frequency-converted alternating current is output to the output terminal 823.
- the mixer 1004 is driven by the control signal 1034 and performs frequency conversion processing on the alternating current output from the gm element 801 based on the frequency of the control signal 1034, and only during the period when the control signal 1034 is in the active state.
- the frequency-converted alternating current is output to the output terminal 823.
- Q phase gm element 803 outputs an alternating current corresponding to gm 803 to mixer 1005, mixer 1006, mixer 1007 and mixer 1008.
- the mixer 1005 is driven by the control signal 1032 and performs frequency conversion processing on the alternating current output from the gm element 803 based on the frequency of the control signal 1032, and only during the period when the control signal 1032 is in the active state.
- the frequency-converted alternating current is output to the output terminal 824.
- the mixer 1006 is driven by the control signal 1033 and performs frequency conversion processing on the alternating current output from the gm element 803 based on the frequency of the control signal 1033, and only during the period when the control signal 1033 is in the active state.
- the frequency-converted alternating current is output to the output terminal 824.
- the mixer 1007 is driven by the control signal 1034 and performs frequency conversion processing on the alternating current output from the gm element 803 based on the frequency of the control signal 1034, and only during the period when the control signal 1034 is in the active state.
- the frequency-converted alternating current is output to the output terminal 825.
- the mixer 1008 is driven by the control signal 1031 and performs frequency conversion processing on the alternating current output from the gm element 803 based on the frequency of the control signal 1031, and only during the period when the control signal 1031 is in the active state.
- the frequency-converted alternating current is output to the output terminal 825.
- a current obtained by adding the output currents of the mixer 806, the mixer 1001, and the mixer 1002 flows through the output terminal 822 (I positive phase).
- a current obtained by adding the output currents of the mixer 807, the mixer 1003, and the mixer 1004 flows to the output terminal 823 (I negative phase).
- a current obtained by adding the output currents of the mixer 808, the mixer 1005, and the mixer 1006 flows to the output terminal 824 (Q positive phase).
- a current obtained by adding the output currents of the mixer 809, the mixer 1007, and the mixer 1008 flows to the output terminal 825 (Q negative phase).
- a step-like output signal 423 and an output signal 424 as shown in FIG. 10 can be taken out. Further, by connecting an appropriate load to the output terminal 824 and the output terminal 825, a stepped voltage waveform having a phase difference of 90 degrees with respect to the output signal 423 and the output signal 424 can be extracted.
- an I-phase output signal is obtained using the gm element 801 and the gm element 802 and the mixer 806, the mixer 807, the mixer 1001, the mixer 1002, the mixer 1003, and the mixer 1004. Further, a Q-phase output signal is obtained using the gm element 803 and the gm element 802 and the mixer 808, the mixer 809, the mixer 1005, the mixer 1006, the mixer 1007, and the mixer 1008.
- the gm element 802 can be shared between the I phase and the Q phase. Further, according to the configuration of the present embodiment, since all the mixers can be driven only with a control signal having a DUTY ratio of 25%, self-mixing, which is a problem in the direct conversion configuration or the low-IF configuration, is avoided. it can.
- a step-like output signal 425 similar to a one-cycle repetitive waveform of a sine wave shown in FIG. 10 can be obtained.
- an output signal having a 90-degree phase difference with respect to the output signal 425 can be obtained. In this way, the harmonic response can be suppressed while suppressing the number of gm elements to be used.
- a capacitive element such as a capacitor can be used as a load connected to the output terminals 822, 823, 824, and 825.
- the harmonic rejection mixer described in Non-Patent Document 1 requires three gm elements. If a quadrature demodulator is configured using the technique of Non-Patent Document 1, six gm elements are required. . On the other hand, according to the configuration of the present embodiment, since the quadrature demodulator can be configured using three gm elements, the number of gm elements can be reduced, and the circuit scale can be reduced. Furthermore, power consumption of the entire circuit can be suppressed. Furthermore, since all the mixers are driven using only control signals having a common DUTY ratio, there is an effect that self-mixing, which is a problem in the direct conversion configuration or the low-IF configuration, can be avoided.
- a single-ended mixer configuration and a double balance mixer configuration can be realized.
- the configuration example using only the control signal having the DUTY ratio of 25% is described.
- the DUTY ratio of the control signal is less than 50%, and some of the gm elements are I-phase and Q-phase. If it can share in a phase, it will not be limited to this.
- the present embodiment shows a configuration for realizing a direct sampling mixer using the harmonic rejection mixer shown in the first to fourth embodiments.
- FIG. 17 is a block diagram showing a schematic configuration of a direct sampling mixer according to the fifth embodiment of the present invention.
- the direct sampling mixer 1200 includes a harmonic rejection mixer 1201, a switched capacitor filter unit 1202, and a control signal generation unit 1203, and frequency-converts a signal input from the input terminal 1221.
- harmonic rejection mixer 1201 As a configuration of the harmonic rejection mixer 1201, a configuration in which a quadrature demodulator is configured using the harmonic rejection mixer shown in the first or second embodiment, or a quadrature shown in the third or fourth embodiment. It is a harmonic rejection mixer having a demodulator configuration.
- the switched capacitor filter unit 1202 performs, for example, I-phase and Q-phase processing using a sampling circuit disclosed in Patent Document 7, and is a filter configured by a MOS switch and a capacitor.
- the control signal generation unit 1203 receives a control signal for driving the harmonic rejection mixer 1201, a control signal for controlling the mixer included in the harmonic rejection mixer 1201, and a control signal for driving the switched capacitor filter unit 1202. It consists of a digital control unit to generate. As a digital control unit that generates a control signal for driving the switched capacitor filter unit 1202, for example, a configuration disclosed in Patent Document 7 can be used.
- a direct sampling mixer can be realized by using the harmonic rejection mixer shown in the first to fourth embodiments.
- the mixer is described as being active during the period when the control signal is Hi (the peak period of the rectangular wave pulse).
- Hi the peak period of the rectangular wave pulse
- NMOS complementary metal-oxide-semiconductor
- the mixer using PMOS can be made active by rereading the Hi period as the Low period (the period of the valley of the rectangular wave pulse). Yes.
- the period in which the mixer is in the active state can be referred to as the on period
- the period in which the mixer is in the inactive state can be referred to as the off period.
- the control signal generation unit is realized by a semiconductor element
- the ratio of the on period to one cycle in the drive signal may be shifted from 50% or 25% to several percent.
- the waveform shape of the output signal of the harmonic rejection mixer varies.
- the harmonic rejection mixer is close to a repetitive waveform of one period (or half period) of a sine wave. A stepped output signal is obtained.
- the harmonic response is suppressed compared to the case where the ratio of the on period to one period is 50% or 25%.
- the effect is slightly reduced, the effect of the present invention can be enjoyed.
- the present inventors have confirmed that the effect of the present invention can be obtained even when variations in semiconductor elements are taken into account when the control signal generation unit is realized by a semiconductor element.
- the harmonic rejection mixer of the present invention can realize a harmonic rejection mixer capable of suppressing the harmonic response while suppressing an increase in the number of gm elements. This is useful for the next harmonic response suppression technology (harmonic rejection).
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Abstract
Description
本実施の形態は、DUTY比(1周期に対するオン期間の比)が50%以外、特に、50%未満となる制御信号を用いることで、ハーモニックリジェクションミキサに用いるgm素子数を削減する構成に関して説明するものである。
本実施形の態は、実施の形態1に記載のハーモニックリジェクションミキサに対して、gm素子への入力信号を差動信号とした場合の例を説明するものである。
本実施の形態は、実施の形態1に示すハーモニックリジェクションミキサ400(図9)を用いて、90度位相差となるI相出力、Q相出力を生成する直交復調器を構成するものである。一部のミキサをDUTY比が50%未満の制御信号を用いて駆動し、ミキサが非アクティブとなる期間(オフ期間)を利用して、I相とQ相でgm素子を共用する構成に関して説明するものである。
本実施の形態は、ハーモニックリジェクションミキサを用いて、90度位相差となるI相出力、Q相出力を生成する直交復調器を構成するものであり、実施の形態3とは別の構成例を示す。実施の形態3では、一部のミキサのみをDUTY比が50%未満の制御信号を用いて駆動したが、本実施の形態では、全てのミキサを、DUTY比が50%未満の共通した値である制御信号を用いてミキサを駆動する点が異なる。ミキサが非アクティブとなる期間を利用して、I相とQ相でgm素子を共用する点については、実施の形態3と共通である。
本実施の形態は、実施の形態1から4に示すハーモニックリジェクションミキサを用いて、ダイレクトサンプリングミキサを実現する構成を示すものである。
4、5、6 ミキサ
10 ハーモニックリジェクションミキサ
11 入力端子
12 出力端子
21、22、23 制御信号
50 パワーアンプ
51、52 増幅回路
55、56、57 入力信号
61、62、63 入力端子
64 出力端子
100 ハーモニックリジェクションミキサ
101、102 gm素子
103、104 ミキサ
105 制御信号生成部
111 入力端子
112 出力端子
121、122 制御信号
123 出力信号
400 ハーモニックリジェクションミキサ
401、402 gm素子
403、404、405、406 ミキサ
407 制御信号生成部
411 入力端子
412、413 出力端子
421、422 制御信号
423、424、425 出力信号
600 ハーモニックリジェクションミキサ
601、602 gm素子
603、604、605、606、607、608、609、610 ミキサ
611 入力端子
612 出力端子
621、622 出力信号
800 ハーモニックリジェクションミキサ
801、802、803 gm素子
804、805、806、807、808、809、810、811 ミキサ
812 制御信号生成部
821 入力端子
822、823、824、825 出力端子
831、832、833、834、835、836、837、838 制御信号
1000 ハーモニックリジェクションミキサ
1001、1002、1003、1004、1005、1006、1007、1008 ミキサ
1009 制御信号生成部
1031、1032、1033、1034 制御信号
1200 ダイレクトサンプリングミキサ
1201 ハーモニックリジェクションミキサ
1202 スイッチドキャパシタフィルタ部
1203 制御信号生成部
1221 入力端子
1222、1223、1224、1225 出力端子
Claims (10)
- 複数のgm素子の後段に並列に接続された複数のミキサの出力を合成することにより、出力信号の波形を調整するハーモニックリジェクションミキサであって、
電圧信号を電流信号に変換する複数のgm素子として、I相用gm素子と、Q相用gm素子と、I相とQ相とで共用する共用gm素子とを有し、前記複数のgm素子の各々の出力は複数に分岐しており、
前記複数のミキサの各々は、前記複数のgm素子のうちの一つの出力の分岐先の各々にスイッチング素子を接続した構成を有し、
前記I相用gm素子及び前記Q相用gm素子の出力の分岐先に接続された前記スイッチング素子は、1周期に対するオン期間の比が50%である駆動信号で制御され、前記共用gm素子の出力の分岐先に接続された前記スイッチング素子は、1周期に対するオン期間の比が50%未満である駆動信号で制御され、
前記共用gm素子に接続された複数の前記スイッチング素子のうちI相出力用のスイッチング素子がオフの期間の少なくとも一部において、Q相出力用のスイッチング素子がオンとなる、
ハーモニックリジェクションミキサ。 - 前記複数のgm素子のいずれにおいても、同じgm素子の出力の分岐先の各々に接続された前記スイッチング素子は、互いに同時にオン状態にならないようなパルス列からなる駆動信号で制御される、
請求項1に記載のハーモニックリジェクションミキサ。 - 前記共用gm素子の出力の分岐先に接続された前記スイッチング素子は、1周期に対するオン期間の比が25%である駆動信号で制御される、
請求項1に記載のハーモニックリジェクションミキサ。 - 前記スイッチング素子を制御する駆動信号群は、互いに位相の異なる同一周波数のパルス列で構成される、
請求項1に記載のハーモニックリジェクションミキサ。 - 前記複数のgm素子は、入力信号に対して振幅の重み付けを行う、
請求項1に記載のハーモニックリジェクションミキサ。 - 複数のgm素子の後段に並列に接続された複数のミキサの出力を合成することにより、出力信号の波形を調整するハーモニックリジェクションミキサであって、
電圧信号を電流信号に変換する複数のgm素子として、I相用gm素子と、Q相用gm素子と、I相とQ相とで共用する共用gm素子とを有し、前記複数のgm素子の各々の出力は複数に分岐しており、
前記複数のミキサの各々は、前記複数のgm素子のうちの一つの出力の分岐先の各々にスイッチング素子を接続した構成を有し、
前記I相用gm素子、前記Q相用gm素子、及び、前記共用gm素子の各々の出力の分岐先に接続された前記スイッチング素子は、1周期に対するオン期間の比が50%未満の共通した値である駆動信号で制御され、
前記共用gm素子に接続された複数の前記スイッチング素子のうちI相出力用のスイッチング素子がオフの期間の少なくとも一部において、Q相出力用のスイッチング素子がオンとなる、
ハーモニックリジェクションミキサ。 - 前記複数のミキサの後段に接続された複数のキャパシタをさらに有し、
前記複数のgm素子のいずれにおいても、同じgm素子の出力の分岐先の各々に接続された前記スイッチング素子のうち、異なるキャパシタに接続されるスイッチング素子については、互いに同時にオン状態にならないようなパルス列からなる駆動信号で制御される、
請求項6に記載のハーモニックリジェクションミキサ。 - 前記I相用gm素子、前記Q相用gm素子、及び、前記共用gm素子の各々の出力の分岐先に接続された前記スイッチング素子は、1周期に対するオン期間の比が25%である駆動信号で制御される、
請求項6に記載のハーモニックリジェクションミキサ。 - 前記スイッチング素子を制御する駆動信号群は、互いに位相の異なる同一周波数のパルス列で構成される、
請求項6に記載のハーモニックリジェクションミキサ。 - 前記複数のgm素子は、入力信号に対して振幅の重み付けを行う、
請求項6に記載のハーモニックリジェクションミキサ。
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JP2010548441A JP5436455B2 (ja) | 2009-01-29 | 2010-01-29 | ハーモニックリジェクションミキサ |
US13/143,789 US8483643B2 (en) | 2009-01-29 | 2010-01-29 | Harmonic rejection mixer |
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JP2009017898 | 2009-01-29 | ||
JP2009-017898 | 2009-01-29 |
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WO2016125600A1 (ja) * | 2015-02-05 | 2016-08-11 | ソニー株式会社 | 信号処理装置および方法 |
JP2016532336A (ja) * | 2013-09-27 | 2016-10-13 | クゥアルコム・インコーポレイテッドQualcomm Incorporated | 高調波除去受動周波数アップコンバータ |
CN106576249A (zh) * | 2015-07-29 | 2017-04-19 | 华为技术有限公司 | 反馈信息的发送装置、接收装置及方法 |
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EP2654202B1 (en) * | 2012-04-19 | 2020-01-01 | Telefonaktiebolaget LM Ericsson (publ) | Harmonic Rejection Mixer Arrangement |
US9455757B2 (en) * | 2012-07-19 | 2016-09-27 | The Trustees Of Columbia University In The City Of New York | Circuits and methods for performing harmonic rejection mixing |
US9490944B2 (en) * | 2012-10-12 | 2016-11-08 | Innoventure L.P. | Phase sector based RF signal acquisition |
US10033348B2 (en) * | 2014-08-07 | 2018-07-24 | Nec Corporation | Variable RF filter and wireless apparatus |
US10191108B2 (en) * | 2015-11-19 | 2019-01-29 | Globalfoundries Inc. | On-chip sensor for monitoring active circuits on integrated circuit (IC) chips |
US10044321B2 (en) | 2016-08-02 | 2018-08-07 | Samsung Electronics Co., Ltd | System and method for linearizing a transmitter by rejecting harmonics at mixer output |
US10454509B2 (en) | 2018-03-13 | 2019-10-22 | Qualcomm Incorporated | Communication circuit including a transmitter |
US11637686B2 (en) * | 2021-01-31 | 2023-04-25 | Avago Technologies International Sales Pte. Limited | Digital transmitter with duty cycle correction |
US11923884B2 (en) * | 2021-09-24 | 2024-03-05 | Qualcomm Incorporated | Configurable harmonic rejection mixer (HRM) |
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JP2016532336A (ja) * | 2013-09-27 | 2016-10-13 | クゥアルコム・インコーポレイテッドQualcomm Incorporated | 高調波除去受動周波数アップコンバータ |
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CN106576249A (zh) * | 2015-07-29 | 2017-04-19 | 华为技术有限公司 | 反馈信息的发送装置、接收装置及方法 |
CN106576249B (zh) * | 2015-07-29 | 2019-11-26 | 华为技术有限公司 | 反馈信息的发送装置、接收装置及方法 |
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JP5436455B2 (ja) | 2014-03-05 |
US8483643B2 (en) | 2013-07-09 |
US20120049926A1 (en) | 2012-03-01 |
JPWO2010087199A1 (ja) | 2012-08-02 |
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