WO2006078009A1 - 受信装置及びこれを用いた電子機器 - Google Patents
受信装置及びこれを用いた電子機器 Download PDFInfo
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- WO2006078009A1 WO2006078009A1 PCT/JP2006/300937 JP2006300937W WO2006078009A1 WO 2006078009 A1 WO2006078009 A1 WO 2006078009A1 JP 2006300937 W JP2006300937 W JP 2006300937W WO 2006078009 A1 WO2006078009 A1 WO 2006078009A1
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- Prior art keywords
- filter
- signal
- operation unit
- intermittent operation
- circuit
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- 238000005259 measurement Methods 0.000 claims description 8
- 230000015556 catabolic process Effects 0.000 abstract description 4
- 238000006731 degradation reaction Methods 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 8
- 239000003990 capacitor Substances 0.000 description 5
- 230000006866 deterioration Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 238000012937 correction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
- H03J3/00—Continuous tuning
- H03J3/02—Details
- H03J3/06—Arrangements for obtaining constant bandwidth or gain throughout tuning range or ranges
- H03J3/08—Arrangements for obtaining constant bandwidth or gain throughout tuning range or ranges by varying a second parameter simultaneously with the tuning, e.g. coupling bandpass filter
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L7/00—Automatic control of frequency or phase; Synchronisation
- H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
- H03L7/08—Details of the phase-locked loop
- H03L7/0805—Details of the phase-locked loop the loop being adapted to provide an additional control signal for use outside the loop
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L7/00—Automatic control of frequency or phase; Synchronisation
- H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
- H03L7/08—Details of the phase-locked loop
- H03L7/081—Details of the phase-locked loop provided with an additional controlled phase shifter
- H03L7/0812—Details of the phase-locked loop provided with an additional controlled phase shifter and where no voltage or current controlled oscillator is used
- H03L7/0814—Details of the phase-locked loop provided with an additional controlled phase shifter and where no voltage or current controlled oscillator is used the phase shifting device being digitally controlled
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
- H03J2200/00—Indexing scheme relating to tuning resonant circuits and selecting resonant circuits
- H03J2200/18—Tuning of a master filter in order to tune its slave filter
Definitions
- the present invention relates to a receiving device incorporating a frequency adjusting circuit that adjusts the frequency characteristics of a filter, and an electronic apparatus using the receiving device.
- Capacitance filters (hereinafter referred to as gm-C filters) are used.
- the gm-C filter generally contains a frequency adjustment circuit that adjusts the frequency characteristics in order to suppress variations in the frequency characteristics due to semiconductor IC manufacturing variations and ambient temperature changes.
- FIG. 9 shows an example of a receiving device incorporating a conventional frequency adjustment circuit.
- the receiving device 900 has a filter 2 composed of a gm-C filter.
- Filter 2 has an input terminal 2a, an output terminal 2b, and a control terminal 2c.
- the input signal before the frequency characteristics are adjusted is input to the input terminal 2a.
- Output signal with adjusted frequency characteristics is output from output terminal 2b.
- a control voltage for adjusting the frequency characteristics is input to the control terminal 2c from a frequency adjustment circuit described later.
- the frequency adjustment circuit 8 has an input terminal 9, a reference filter 4, a multiplication circuit 6, and a low-pass filter 7.
- a reference clock signal 5 made by a crystal oscillator (not shown) or the like is input to the input terminal 9.
- the reference clock signal 5 input to the input terminal 9 is input to the reference filter 4.
- the reference clock signal output from the reference filter 4 is input to the first input terminal 6 a of the multiplier circuit 6. Further, the reference clock signal 5 is inputted as it is to the second input terminal 6b of the multiplication circuit 6.
- the multiplier circuit 6 multiplies two reference clock signals that have passed through different signal paths, compares the phases of the two, and outputs a voltage corresponding to the phase difference. Output from multiplier 6 When the voltage is input to the low-pass filter 7, it is smoothed and output as a control voltage. The output control voltage is negatively fed back to the reference filter 4 to form a phase control loop, and the frequency characteristic of the reference filter 4 is controlled with high accuracy and good reproducibility.
- the reference filter 4 is composed of a second-order low-pass filter. When the phase control loop is locked, the passing reference clock signal 5 is phase shifted 90 degrees by the reference filter 4.
- control voltage output from the low-pass filter 7 is input to the control terminal 2c as the control voltage of the filter 2.
- the frequency characteristics of the input signal input to the input terminal 2a of filter 2 are adjusted with high accuracy, and the output signal is extracted from the output terminal 2b.
- the extracted output signal is used, for example, for demodulation processing of the receiving device.
- the frequency characteristic of the filter 2 must be adjusted by operating the frequency adjustment circuit 8 constituted by the reference filter 4, the multiplication circuit 6 and the low-pass filter 7. For this reason, a change in the frequency characteristics of the filter 2 causes a problem that the signal waveform power of the symbol, that is, 1-bit or multi-bit data that can be transmitted by one modulation is deteriorated.
- the present invention solves the above-described conventional problems, and provides a receiving apparatus and an electronic apparatus that can suppress the deterioration of the signal waveform of a symbol.
- the receiving apparatus of the present invention includes a filter that transmits an output signal having symbols at arbitrary time intervals, and the filter is intermittently set at predetermined intervals based on the output signal from the filter. And an intermittent operation unit to be controlled.
- the timing for switching the signal for controlling the frequency characteristics of the filter is set to an arbitrary amount of time between the symbol period and the symbol period, such as a guard interval period, for example. This is to suppress deterioration.
- the receiving apparatus of the present invention includes a filter that transmits an output signal having symbols at arbitrary time intervals. Based on the output signal from this filter, An intermittent operation unit for intermittent control is provided.
- the receiving device of the present invention generates a timing signal for turning on / off the power supply of the intermittent operation unit based on an arbitrary time interval in the output signal output from the filter. Having a generator.
- the timing signal generator generates a timing signal for turning on and off the power supply of the intermittent operation unit based on the control signal from the intermittent operation unit.
- the timing signal generator built in the receiving apparatus of the present invention generates a timing signal for turning on / off the power supply of the intermittent operation unit based on the signal strength of the control signal from the intermittent operation unit. .
- the timing signal generator is configured to turn on and off the power supply of the intermittent operation unit based on the control signal from the intermittent operation unit and the power supply off period of the intermittent operation unit. Generate a signal.
- the receiving device of the present invention includes a register that holds a control signal from the intermittent operation unit, the filter is controlled based on the control signal held by the register, and the timing signal generator A timing signal for turning on / off the power supply of the intermittent operation unit is generated based on a reference clock signal in addition to an arbitrary time interval in FIG.
- the frequency adjustment circuit includes a reference filter that sets a phase difference in the reference clock signal, a multiplication circuit that multiplies the output signal of the reference filter and the reference clock signal, and multiplication. Having a low pass filter connected to the output of the circuit. Also, negative feedback is applied to the reference filter so that the output voltage of the low-pass filter is constant at the cutoff frequency of the reference filter. It also has a sample-and-hold (SH) circuit that holds the output voltage from the low-pass filter for a fixed period and an analog-to-digital converter (ADC) that converts the analog output voltage (analog data) of the sample-and-hold circuit into digital data.
- SH sample-and-hold
- ADC analog-to-digital converter
- DAC digital-analog converter
- the receiving device of the present invention includes a reference filter that sets a phase difference in the reference clock signal, an EXOR circuit that outputs an exclusive OR of the output signal of the reference filter and the reference clock signal, and an EXOR circuit.
- a measurement circuit for measuring the duty ratio of the output signal In addition, it has a register that uses the output signal of the measurement circuit as a filter control signal and holds the output signal of the measurement circuit as digital data. With such a circuit configuration, the frequency adjustment circuit can be operated intermittently.
- an electronic apparatus is equipped with the above-described receiving device.
- FIG. 1 is a block diagram of a receiving device in which a frequency adjustment circuit according to a first embodiment of the present invention is incorporated.
- FIG. 2 is a timing chart of a receiving device with a built-in frequency adjusting circuit according to the first embodiment of the present invention.
- FIG. 3 is a block diagram of a receiving device with a built-in frequency adjusting circuit according to the second embodiment of the present invention.
- Fig. 4 is a timing chart of a receiving device incorporating a frequency adjusting circuit according to the second embodiment of the present invention.
- FIG. 5 is a block diagram of a receiving device with a built-in frequency adjusting circuit according to the third embodiment of the present invention.
- Fig. 6 is a timing chart of a receiving device incorporating a frequency adjusting circuit according to a third embodiment of the present invention.
- FIG. 7 is a block diagram of a receiving device incorporating a frequency adjusting circuit according to a fourth embodiment of the present invention.
- Fig. 8 is a timing chart of a receiving device incorporating a frequency adjusting circuit according to a fourth embodiment of the present invention.
- FIG. 9 is a block diagram of a receiving apparatus incorporating a conventional filter frequency adjusting circuit.
- FIG. 1 is a block diagram showing a receiving apparatus incorporating a frequency adjusting circuit according to the first embodiment of the present invention.
- the receiving device 100 includes a filter 12 and a frequency adjustment circuit 18.
- the fineletter 12 includes a gm_C filter.
- the filter 12 has an input terminal 12a to which an input signal is inputted, and an output terminal 12b for taking out the output signal 11 in which the frequency characteristic of the input signal is adjusted.
- a control terminal 12c to which a control voltage for adjusting frequency characteristics is input from the frequency adjustment circuit 18 is provided. A control voltage for adjusting the frequency characteristics is input to the control terminal 12c from a frequency adjustment circuit described later.
- the frequency adjustment circuit 18 has an intermittent operation unit 13.
- the intermittent operation unit 13 includes an input terminal 19, a reference filter 14, a multiplication circuit 16, a low-pass filter 17, and an ADC (analog / digital converter) 21.
- the reference clock signal 15 is input to the reference filter 14 and the multiplier circuit 16 through the input terminal 19.
- the phase is shifted by the reference filter 14 and input to the first input terminal 16 a of the multiplier circuit 16.
- the reference clock signal 15 input to the input terminal 19 is input to the second input terminal 16b of the multiplication circuit 16 as it is.
- the multiplier circuit 16 multiplies the phase-shifted signal and the reference clock signal 15 and outputs a voltage corresponding to the phase difference between the two.
- the low-pass filter 17 smoothes the output voltage extracted from the multiplication circuit 16.
- the sample hold (SH) circuit 20 holds the signal smoothed by the low-pass filter 17 as analog data.
- the analog data held in the SH circuit 20 is converted into digital data by an ADC (analog-digital converter) 21.
- the digital data converted by the ADC 21 is input to the register 23.
- the digital data held in register 23 is input to DAC (digital analog converter) 24.
- the DAC 24 converts the digital data retrieved from the register 23 into analog data.
- the receiving apparatus 100 further includes a timing signal generator 25 to which the guard interval signal 26 is input from the outside.
- the timing signal generator 25 controls the intermittent operation unit 13 and the register 23.
- the guard interval signal is a signal whose length is longer than the theoretical value, and the last part of the symbol is added before the symbol in order to prevent the influence of delayed waves.
- FIG. 2 is an operation timing chart of the frequency adjustment circuit 18 shown in FIG.
- the intermittent operation unit control signal 130 is output from the timing signal generator 25 and controls the on / off operation of the intermittent operation unit 13.
- the intermittent operation unit 13 is turned on during the on period 130 H (Hi level) of the intermittent operation unit control signal 130 and is turned off during the off periods 130Ll (Lo level) and 130L2 (Lo level).
- the off period is divided into two, such as 130L1 and 130L2. The reason is that, as will be described later, the off period is adjusted according to the amount of change in the control voltage of the reference filter. These off periods are not limited to two, but three, four or more may be provided.
- the reference filter control voltage 140 is extracted from the SH circuit 20. Reference filter control voltage
- the reference filter 140 controls the operation of the reference filter 14.
- the reference filter control voltage 140 converges in the predetermined convergence periods 142 and 144 when the intermittent operation unit 13 is in the ON state, that is, when the intermittent operation unit control signal 130 is in the ON period 130H.
- Voltage Level 146 or 148 is held in SH circuit 20.
- ADC 21 converts analog data into digital data for a certain period TC. The size of the fixed period TC depends on the guard interval period G26.
- Filter control voltage 240 is taken from the output side of DAC 24 and input to control terminal 12 c of filter 12.
- the reference filter control voltage 140 extracted from the SH circuit 20 is converted into digital data by an ADC 21 (analog-digital converter) 21. This digital data is held in the register 23 and input to the DAC 24.
- the filter 12 is controlled by the filter control voltage 240 extracted from the DAC 24.
- the change amounts AV1 and AV2 of the control voltage of the reference filter 14 are calculated from the digital data input to the DAC 24 and the previous digital data. If the change ⁇ is large, the off period 130L1 is shortened. If the amount of change ⁇ VI is small, the off period 130L1 is set long. Similarly, the change amount AV2 of the control voltage of the reference filter 4 can be considered in the same manner. If the change amount ⁇ 2 is large, the off period 130L2 is shortened, and if the change amount ⁇ 2 is small, the off period 130L2 is lengthened. Set.
- An example of a method for deriving the off periods 130L 1 and 130L2 from the control voltage change amount can be implemented by preparing an off period setting table for the control voltage change amount.
- the period during which the DAC 24 converts digital data to analog data is a fixed period TC.
- the timing for controlling the filter 12 uses a guard interval period employed in terrestrial digital broadcasting or the like.
- This guard interval period is defined as “arbitrary time interval” in the present invention.
- This “arbitrary time interval” may be constant or variable. If one of these configurations is adopted, the timing for switching the signal for controlling the frequency characteristics of the filter 12 is set to an arbitrary period between the symbol periods, for example, the guard interval period G26. Therefore, it is possible to suppress the degradation of the symbol signal waveform.
- the guard interval signal 26 is input to the timing signal generator 25.
- the guard interval signal 26 has a valid symbol period S26 and a guard interval period G26.
- Effective symbol period S26 and guard interval period G26, (S26 + G26) It can be defined as the Bol period.
- the symbol period is a period of 1-bit or multi-bit data that can be transmitted with one modulation.
- the timing signal generator 25 receives the output signal from the filter 12, and turns on the power supply of the intermittent operation unit 13 before a predetermined period from the guard interval period G26 of the output signal. Even if the power of the intermittent operation unit 13 is turned off after the filter 13 controls the filter 12, it is acceptable. As a result, the power consumption of the intermittent operation unit 13 can be reduced.
- the guard interval period G26 of the guard interval signal 26 input from the outside is detected, and the digital data is held in the register 23 in synchronization with the guard interval period G26, and the control voltage is filtered by the DAC 24. Even if it is input to 12, it is good. As a result, it is possible to supply the control signal to the filter 12 during the periods 130L1 and 130L2 in which the intermittent operation unit 13 is off.
- the intermittent operation unit 13 is in the OFF state.
- the timing to turn off is determined by the timing signal generator 25 as follows.
- the amount of control voltage change ⁇ VI or ⁇ V2 of the reference filter 14 is calculated from the digital data input to the current DAC 24 and the previous digital data. If the amount of change is large, the off period 130L1 or 130L2 is shortened, and if it is small, the off period 130L1 or 130L2 is lengthened.
- FIG. 2 shows an example in which the off period 130L1 in which AVI is larger than AV2 is shorter than 130L2.
- an off period setting table for the change amount of the control voltage can be prepared.
- the timing signal generator 25 generates a timing signal for turning on / off the power supply of the intermittent operation unit 13 based on the control signal from the intermittent operation unit 13, so that the intermittent operation unit 13 Power consumption can be kept low.
- the intermittent operation unit 13 holds the control voltage held in the SH circuit 20 during the ON period 130H even during the OFF periods 130L1 and 130L2, so that the initial voltage of the next operation period is obtained. use.
- the convergence periods 142 and 144 can be shortened, and the operation time of the intermittent operation unit 13 can be shortened.
- the SH circuit 20 that holds the control voltage as an analog value includes a low-pass filter and a reference filter. Since it is configured between the filters, when the frequency adjustment circuit 18 is on, it passes through the control voltage SH circuit 20 as it is. For this reason, when the intermittent operation unit 13 is turned off, the control voltage before being turned off is held. As a result, negative feedback is applied from the control voltage before turning off when the ON operation is restarted, and the convergence period can be shortened.
- FIG. 3 is a block diagram of a receiving device incorporating the filter and its frequency adjusting circuit according to the second embodiment of the present invention.
- the receiving apparatus 300 performs substantially the same circuit configuration and circuit operation as those of the first embodiment (shown in FIG. 1).
- a filter 12 composed of a gm_C filter.
- the filter 12 has an input terminal 12a to which an input signal is input, and an output terminal 12b from which an output signal in which the frequency characteristics of the input signal are adjusted is taken out.
- a control terminal 12c for adjusting the frequency characteristics of the input signal input to the input terminal 12a.
- a control voltage is input to the control terminal 12c from a DAC 24 built in the frequency adjusting circuit 18 described later.
- receiving apparatus 300 includes frequency adjustment circuit 18 in which intermittent operation unit 13 is incorporated.
- the intermittent operation unit 13 includes an input terminal 19, a reference filter 14, a multiplication circuit 16, a low-pass filter 17 and an ADC (analog / digital converter) 21.
- the frequency adjustment circuit 18 includes an SH circuit 20, a register 23, and a DAC (digital / analog converter) 24, as in the first embodiment.
- a reference filter control voltage 140 is taken out from the SH circuit 20 and a filter control voltage 240 is taken out from the DAC 24 separately.
- the receiving apparatus 300 includes a timing signal generator 25.
- An external guard interval signal 26 and a reference clock signal 15 are input to the input side of the timing signal generator 25 via the input terminal 19 and the signal connection line 26a.
- An intermittent operation unit control signal 130 for controlling the intermittent operation unit 13 is output from the output side of the timing signal generator 25.
- FIG. 4 is an operation timing chart of the frequency adjustment circuit 18 shown in FIG.
- the intermittent operation unit control signal 130 is output from the timing signal generator 25, and the intermittent operation unit 13 is turned on and off. Control.
- the intermittent operation section 13 is turned on during the on period 130H (Hi level) of the intermittent operation section control signal 130, and is turned off during the off periods 130Ll (Lo level) and 130L2 (Lo level).
- the reference filter control voltage 140 is output from the SH circuit 20.
- Reference filter control voltage 140 controls the operation of reference filter 14 and ADC 21.
- the intermittent operation unit 13 is in an ON state, that is, when the intermittent operation unit control signal 130 is in the ON period 130H, the reference filter control voltage 140 is converged during a predetermined convergence period 142, 144 and is constant for a certain period.
- the predetermined voltage level 146 or 148 is held in the SH circuit 20.
- ADC21 performs an operation to convert analog data into digital data for a certain period TC.
- the size of the fixed period TC depends on the guard interval period G26.
- the filter control voltage 240 is taken from the DAC 24 and input to the control terminal 12c of the filter 12 in order to control the filter 12.
- the amount of control voltage change ⁇ VI, AV2 of the reference filter 14 is calculated from the digital data input to the DAC 24 and the previous digital data. If the change ⁇ is large, the off period 130L1 or 130L21 is shortened. If the control voltage change ⁇ 2 is small, set the off period 130L1 or 130L2 to be longer than the previous value.
- FIG. 4 illustrates an example in which A V1 is shorter than A V2 and shorter than the off-period 130L1 force 30L2.
- the second embodiment is different from the first embodiment shown in FIG. 1 in that the reference clock signal 15 is input to the timing signal generator 25.
- the timing for controlling the filter 12 uses the guard interval period G26 used in terrestrial digital broadcasting and the like.
- This guard interval period is defined as “arbitrary time interval” in the present invention.
- This “arbitrary time interval” may be constant or variable. If one of these configurations is adopted, the timing for switching the signal for controlling the frequency characteristics of the filter 12 is set to an arbitrary period between the symbol periods, for example, the guard interval period G26. As a result, the deterioration of the signal waveform of the symbol can be suppressed.
- the guard interval signal 26 is input to the timing signal generator 25.
- Guard inter The single signal 26 has a valid symbol period S26 and a guard interval period G26.
- the symbol period can be defined as (S26 + G26), which is the sum of the effective symbol period S26 and the guard interval period G26.
- the symbol period is a period of 1-bit or multi-bit data that can be transmitted with one modulation.
- the timing signal generator 25 receives the output signal from the filter 12, and turns on the power supply of the intermittent operation unit 13 before a predetermined period from the guard interval period G26 of the output signal. Even if the power of the intermittent operation unit 13 is turned off after the filter 13 controls the filter 12, it is acceptable. As a result, the power consumption of the intermittent operation unit 13 can be reduced.
- the guard interval period G26 of the guard interval signal 26 input from the outside is detected, and the digital data is held in the register 23 in synchronization with the guard interval period G26, and the control voltage is filtered by the DAC 24. Even if it is input to 12, it is good. Thus, the control signal can be supplied to the filter 12 even when the intermittent operation unit 13 is placed in the off periods 130L1 and 130L2.
- the intermittent operation unit 13 is turned off.
- the period 130L1 and 130L2 to be turned off are determined by the timing signal generator 25 as follows.
- the timing signal generator 25 counts the rising TR or falling TF of the reference clock signal 15, and when the preset count number N is reached, the intermittent operation unit 13 shifts to the ON state. .
- the arbitrary count number N may be a fixed value or a variable value such as pseudo-random. The effect of these configurations is that the circuit scale and power consumption can be made relatively small for fixed values, and the switching timing is non-periodic for variable values, so that the filter characteristics vary periodically. Generation of noise can be suppressed.
- Embodiment 3 will be described with reference to the drawings. Although circuit configurations similar to those in Embodiments 1 and 2 are often duplicated, they will be described as follows.
- the receiving apparatus 500 includes the filter 12 configured with a gm_C filter, similarly to the first embodiment (shown in FIG. 1).
- Filter 12 has an input signal Input terminal 12a, and an output terminal 12b from which an output signal whose frequency characteristic of the input signal is adjusted is taken out.
- it has a control terminal 12c for adjusting the frequency characteristics of the input signal input to the input terminal 12a.
- a control voltage is input to the control terminal 12c from a DAC 24 described later.
- receiving apparatus 500 includes frequency adjustment circuit 18 in which intermittent operation unit 13 is incorporated.
- the intermittent operation unit 13 includes an input terminal 19, a reference filter 14, a multiplication circuit 16, a low-pass filter 17 and an ADC (analog / digital converter) 21.
- the frequency adjustment circuit 18 includes an SH circuit 20, a register 23, and a DAC (digital analog converter) 24, as in the first and second embodiments.
- the receiving device 500 includes a timing signal generator 25.
- a reception state signal 27 is input to the input side of the timing signal generator 25.
- An intermittent operation unit control signal 130 for controlling the intermittent operation unit 13 is output from the output side of the timing signal generator 25.
- the reception state signal 27 has a reception period R27 and a non-reception period F27.
- the demodulation processing unit arranged at the subsequent stage of the receiving device 500 uses the signal output from the output terminal 12b of the filter 12 to receive the reception period R27 and the non-reception period F27.
- DVB-H one of the standards for terrestrial digital broadcasting, has time information when the next signal is transmitted in the received signal. Can do.
- FIG. 6 is a timing chart of the frequency adjustment circuit 18 shown in FIG.
- the intermittent operation unit control signal 130 is output from the timing signal generator 25 and controls the on / off operation of the intermittent operation unit 13.
- the intermittent operation unit 13 is turned on during the on period 130H (Hi level) of the intermittent operation unit control signal, and is turned off during the off periods 130Ll (Lo level) and 130L2 (Lo level).
- the reference filter control voltage 140 is output from the SH circuit 20.
- Reference filter control voltage 140 controls the operation of reference filter 14 and ADC 21.
- the intermittent operation unit 13 is in the ON state, that is, when the ON period is 130H
- the reference filter control voltage 140 converges in the convergence periods 142 and 144, and after a predetermined period TC has elapsed, the predetermined voltage level 146 or 148 is changed to the SH circuit 20 Held in.
- ADC21 receives analog data for a certain period of time. Performs conversion to digital data.
- the size of the fixed period TC depends on the guard interval period G26.
- the reference filter control voltage 140 extracted from the SH circuit 20 is converted into digital data by an ADC 21 (analog digital converter) 21. Digital data is held in the register 23 and input to the DAC 24.
- the filter 12 is controlled by the filter control voltage 240 extracted from the DAC 24.
- the timing signal generator 25 controls the intermittent operation unit 13 and the register 23 from a plurality of digital data held in the register 23 and an external reception state signal 27 indicating a reception period. It differs from the first and second embodiments in that a signal is generated.
- the intermittent operation unit control signal 130 is output from the timing signal generator 25 to perform on / off control of the intermittent operation unit 13.
- the intermittent operation section 13 is turned on during the ON period 130H (Hi level) of the intermittent operation section control signal 130, and is turned off during the OFF periods 130Ll (Lo level) and 130L2 (Lo level).
- the reference filter control voltage 140 is output from the SH circuit 20.
- Reference filter control voltage 140 controls the operation of reference filter 14 and ADC 21.
- the intermittent operation unit 13 is in the ON state, that is, when the intermittent operation unit control signal 130 is in the ON period 130H, the reference filter control voltage 140 converges in the convergence periods 142 and 144, and after a predetermined period TC has elapsed, Voltage level 146 or 148 is held in SH circuit 20.
- ADC21 performs an operation to convert analog data to digital data at TC for a certain period. The size of the fixed period TC depends on the guard interval period G26.
- the filter control voltage 240 is taken from the DAC 24 and input to the control terminal 12 of the filter 12 in order to control the filter 12.
- the amount of change AV3 and AV4 of the control voltage of the reference filter 14 is calculated from the digital data input to the DAC 24 and the previous digital data. If the amount of change AV3 is large, the off period 130L1 is shortened. If the change amount A V3 is small, the off period 130L1 is set long. Similarly, the change amount AV4 of the control voltage of the reference filter 14 can be considered in the same way. If the change amount AV4 is large, the off period 130L2 is shortened, and if the change amount AV4 is small, the off period 130L2 is lengthened. Set. Note that the off period 130L from the amount of change in the control voltage As an example of a method for deriving 1 and 130L2, for example, a setting table showing the correlation of the off period to the amount of change in the control voltage can be prepared.
- the timing for converting digital data to analog values in the DAC 24 uses a period when data is not received, that is, a non-reception period TOFF.
- the reception state signal 27 indicating the reception period TON or the non-reception period TOFF is detected, the digital data is held in the register 23, the digital data is converted into a control voltage by the digital analog converter 24 , and the filter Enter in 12.
- the timing of switching the signal for controlling the frequency characteristics of the filter 12 is set to be within an arbitrary time interval between the symbol periods, such as the non-reception period TFF, for example. Waveform deterioration can be suppressed.
- FIG. 7 is a block diagram of a receiving device incorporating the filter and its frequency adjusting circuit according to the fourth embodiment of the present invention.
- the receiving device 700 includes a filter 12 and a frequency adjustment circuit 35.
- the filter 12 is composed of a gm-C filter.
- the filter 12 has an input terminal 12a to which an input signal is input, and an output terminal 12b from which an output signal in which the frequency characteristics of the input signal are adjusted is taken out.
- a control terminal 12c to which a control voltage for adjusting frequency characteristics is input from the frequency adjustment circuit 35 is provided.
- a control voltage for adjusting the frequency characteristics is input from the register 23 described later to the control terminal 12c.
- the frequency adjustment circuit 35 has an intermittent operation unit 34.
- the intermittent operation unit 34 includes an input terminal 19, a reference filter 14, an EX ⁇ R circuit 31, a measurement circuit 32, and a decoder 33.
- the intermittent operation unit 34 outputs a reference filter 14 for phase-shifting the reference clock signal 15 input to the input terminal 19, and a signal obtained by exclusive ORing the phase-shifted signal and the reference clock signal.
- An EXOR circuit 31 is provided.
- the EXOR circuit 31 is connected to the reference filter 14.
- the first input terminal 31a is connected to the input terminal 19, and the second input terminal 31b is directly connected to the input terminal 19.
- the decoder 33 that converts the measurement result into a control signal for controlling the filter 12, and the decoder 33
- a timing signal for controlling the intermittent operation unit 34 and the register 23 is generated from the register 23 for holding the control signal as digital data, a plurality of digital data held in the register 23 and an external guard interval signal 26 indicating the reception period.
- the timing signal generator 25 is composed of: In general, the duty ratio is the ratio of the Hi level output signal period to the Lo level output signal period in the digital signal.
- the frequency adjustment circuit 35 includes a register 23 and a timing signal generator 25.
- the timing signal generator 25 receives the guard interval signal 26 described in the first and second embodiments.
- FIG. 8 is an operation timing chart of receiving apparatus 700 shown in FIG.
- the intermittent operation unit control signal 340 is output from the timing signal generator 26.
- the operation of the intermittent operation unit 34 is controlled following the on / off of the intermittent operation unit control signal 340.
- the intermittent operation unit 34 is turned on during the ON period 130H (Hi level) of the intermittent operation unit control signal 130 and is turned off during the OFF period 130L (Lo level).
- the filter control signal 230 is a signal for selecting a desired resistor from a plurality of resistors having different resistance values, for example, in a circuit in which the filter 12 switches the resistance value to change the frequency characteristic. . If the resistance value that can be set is 64 gradations, values 232 and 234 of the filter control signal 230 in FIG.
- the amount of change A D1, A D2 of the filter control signal 230 is calculated from the filter control signal that has been manpowered by the FINOLETA 12 and the previous filter control signal. If the amount of change A D1 is large, the OFF period 340L1 is shortened. If the change amount A Dl is small, the off period 340L1 is set long.
- the change amount D2 of the filter control signal 230 can be considered in the same manner. If the change amount AD2 is large, the off period 340L2 is shortened, and if the change amount AD2 is small, the off period 340L2 is set long.
- An example of a method for deriving the off periods 340L1 and 340L2 from the amount of change in the filter control signal For example, it can be implemented by preparing a setting table that represents the correlation of the off period to the amount of change in the filter control signal.
- the configuration for switching the resistance is given as an example, but the same can be considered when switching the capacitance value of the capacitor or the inductance value of the coil.
- the operation of the frequency adjustment circuit 35 will be described with reference to the timing chart of FIG.
- the operation state of the intermittent operation unit 34 can be switched by the intermittent operation unit control signal 340.
- the intermittent operation unit 34 is in the ON state, the duty ratio of the output signal obtained by performing exclusive OR of the signal phase-shifted by the reference filter 14 and the reference clock signal 15 from the input terminal 19 is measured.
- the duty ratio of the output signal of the EXOR circuit 31 is determined by the product of the resistor and the capacitor built in the reference filter 14 and the reference clock signal 15. For this reason, if the reference clock signal 15 is constant, it can be understood by monitoring the duty ratio and grasping the variation amount of the product of the resistor and the capacitor. If the correction value of the resistor or capacitor for the duty ratio is prepared in advance as a table, the frequency characteristic of the filter 12 can be adjusted by reflecting the correction value corresponding to the size of the duty ratio in the filter 12. Power S can be.
- the decoder 33 generates the control signal for the filter 12 from the duty ratio of the output signal.
- the timing for controlling the filter 12 uses the guard interval period G26 employed in terrestrial digital broadcasting.
- the guard interval period G26 is defined as “arbitrary time interval” as used in this specification.
- the “arbitrary time interval” may be constant or variable.
- the filter control signal 230 is a signal for selecting a desired resistor from a plurality of resistors having different resistance values, for example, in a circuit in which the filter 12 switches the resistance value to change the frequency characteristic. . If the resistance value that can be set is 64 gradations, the values 232 and 234 of the filter control signal 230 in FIG. A change amount A D1 of the filter control signal 230 from the filter control signal input to the filter 12 and the previous filter control signal. ⁇ Calculate D2, and if the amount of change A Dl is large, shorten the off period 340L1, and if the amount of change A Dl is small, set the off period 340L1 longer. The change amount D2 of the filter control signal 230 can be considered in the same manner.
- the off period 340L2 is shortened, and if the change amount AD2 is small, the off period 340L2 is set long.
- a method for deriving the off periods 340L1 and 340L2 from the amount of change in the filter control signal for example, a setting table showing the correlation of the off period to the amount of change in the filter control signal is prepared. Can be implemented. Also, the configuration for switching the resistance is given as an example, but the same can be considered when switching the capacitance value of the capacitor or the inductance value of the coil.
- the guard interval signal 26 shown in FIG. 8 is the same as that employed in the first embodiment (FIG. 2) and the second embodiment (FIG. 4). That is, the guard interval signal 26 is input to the timing signal generator 25.
- the guard interval signal 26 has a valid symbol period S26 and a guard interval period G26.
- the symbol period can be defined as (S26 + G26), which is the sum of the effective symbol period S26 and the guard interval period G26.
- the symbol period is a period of 1-bit or multi-bit data that can be transmitted by one modulation.
- the timing signal generator 25 receives the output signal from the filter 12 and turns on the power supply of the intermittent operation unit 13 before a predetermined period from the guard interval period of the output signal.
- the intermittent operation unit 13 may be turned off after controlling the filter 12. As a result, the power consumption of the intermittent operation unit 13 can be reduced.
- the guard interval period G26 of the guard interval signal 26 input from the outside is detected, and the digital data is held in the register 23 in synchronization with the guard interval period G26, and the control voltage is filtered by the DAC 24. Even if it is input to 12, it is good. Thus, the control signal can be supplied to the filter 12 even when the intermittent operation unit 13 is off.
- the receiving device incorporating the filter frequency adjusting circuit according to the present invention has the special effect of being able to suppress the deterioration of the signal waveform of the symbol, and can provide digital terrestrial broadcasting. This is useful for electronic devices such as mobile terminals and in-car TVs that receive the signal, and thus has high industrial applicability.
Landscapes
- Circuits Of Receivers In General (AREA)
- Networks Using Active Elements (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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JP2006520435A JPWO2006078009A1 (ja) | 2005-01-24 | 2006-01-23 | 受信装置及びこれを用いた電子機器 |
EP06712153A EP1713180A4 (en) | 2005-01-24 | 2006-01-23 | RECEIVER DEVICE AND ELECTRONIC DEVICE THEREFOR |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2005015083 | 2005-01-24 | ||
JP2005-015083 | 2005-01-24 |
Publications (1)
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WO2006078009A1 true WO2006078009A1 (ja) | 2006-07-27 |
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PCT/JP2006/300937 WO2006078009A1 (ja) | 2005-01-24 | 2006-01-23 | 受信装置及びこれを用いた電子機器 |
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Country | Link |
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US (1) | US7616939B2 (ja) |
EP (1) | EP1713180A4 (ja) |
JP (1) | JPWO2006078009A1 (ja) |
CN (1) | CN1943112A (ja) |
WO (1) | WO2006078009A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2012195759A (ja) * | 2011-03-16 | 2012-10-11 | Seiko Epson Corp | トランスコンダクタンス調整回路、回路装置及び電子機器 |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2011114622A (ja) * | 2009-11-27 | 2011-06-09 | Panasonic Corp | フィルタ自動調整回路及び方法並びに無線通信装置 |
US8729930B2 (en) * | 2011-11-02 | 2014-05-20 | System General Corp. | Successive approximation multiplier-divider for signal process and method for signal process |
EP3115854B1 (en) * | 2015-07-08 | 2020-08-26 | Siemens Schweiz AG | Universal input / output circuit |
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- 2006-01-23 EP EP06712153A patent/EP1713180A4/en not_active Withdrawn
- 2006-01-23 CN CNA2006800001084A patent/CN1943112A/zh active Pending
- 2006-01-23 JP JP2006520435A patent/JPWO2006078009A1/ja active Pending
- 2006-01-23 WO PCT/JP2006/300937 patent/WO2006078009A1/ja active Application Filing
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Also Published As
Publication number | Publication date |
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JPWO2006078009A1 (ja) | 2008-08-14 |
EP1713180A1 (en) | 2006-10-18 |
US20070167143A1 (en) | 2007-07-19 |
EP1713180A4 (en) | 2010-03-17 |
CN1943112A (zh) | 2007-04-04 |
US7616939B2 (en) | 2009-11-10 |
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