JP4683032B2 - Wireless communication device - Google Patents

Description

  The present invention calculates an output deviation of an oscillation circuit used when generating a transmission / reception frequency in a wireless communication device based on a signal output from another oscillation circuit not used for transmission / reception, and according to the deviation. Thus, the transmission / reception frequency is corrected.

  The wireless communication device uses an LC oscillation circuit, a ceramic oscillator, a crystal oscillator, or the like according to the transmission / reception frequency to generate and use a frequency that is the basis of the transmission / reception frequency.

  However, these oscillation circuits exhibit temperature characteristics, and if the environment in which the wireless device is used is high or low, it cannot transmit within a frequency deviation that conforms to the wireless communication standard. Furthermore, when the frequency deviation becomes large, communication may not be established.

In such a case, conventionally, a crystal oscillator such as TCXO (Temperature Compensated Xtal Oscillator) and an element for correcting to cancel the temperature characteristic of the oscillator itself, or a component in which logic is combined into one package, are used. Information to solve or provide a temperature detection circuit and input the signal level to a VCOX (Voltage Controlled Xtal Oscillator) to control the frequency, or to compensate temperature characteristics of the oscillation circuit such as crystal oscillation beforehand Is recorded in the recording unit, and compensation is performed by calling the compensation amount from the recording unit according to the value detected by the temperature detection circuit (see, for example, Patent Document 1).
JP 2001-007714 A

  However, in the correction method using the temperature detecting element as described above, a relatively large error occurs due to the accuracy of the temperature detecting element. In addition, the temperature characteristics of the crystal unit are not only very wide, but also affect the influence of the peripheral circuit on which the crystal unit is mounted and individual differences. It is necessary to make corrections.

  Therefore, when an element such as TCXO is manufactured, adjustment is required for each product, or correction is required for each product in the entire communication device including the oscillation circuit. Furthermore, when performing adjustment, it is necessary to check the frequency by actually setting the wireless device in the transmission state or reception state, but in order to capture the frequency, a measuring instrument corresponding to a high frequency is required, A very expensive and highly accurate one is required.

  In addition, the applied voltage range of the oscillating element subjected to temperature correction may be limited, and the current consumption may be large, so that it may be difficult to mount the device with a battery or the like.

  Therefore, in the present invention, an oscillator having a relatively constant temperature characteristic is used separately from an oscillator that generates a transmission / reception frequency of wireless communication, and the deviation of the oscillator used for wireless communication is counted, and according to the count amount. This is to correct the transmission / reception frequency.

ADVANTAGE OF THE INVENTION According to this invention, the burden which performs correction | amendment with respect to temperature and adjustment for every radio | wireless communication apparatus can be reduced, and the radio | wireless communication apparatus robust with respect to temperature can be provided.

  According to a first aspect of the present invention, there is provided a first oscillating unit that generates source oscillation at a frequency during communication, a second oscillating unit that generates a frequency different from the first oscillating unit, and a frequency output from the second oscillating unit. A transmission frequency using a counting unit that calculates a deviation amount of the first oscillation unit with reference to a quantity, and a predetermined value and a deviation amount calculated by the counting unit when performing wireless communication. A calculation unit that performs register setting for generating a wireless communication unit that generates a signal to be transmitted using the transmission frequency output from the calculation unit and the frequency output from the first oscillation unit, A wireless communication device provided.

  As a result, the wireless communication device can transmit with a highly accurate frequency.

  According to a second aspect of the present invention, there is provided a first oscillating unit that generates a source oscillation of a frequency during communication, a second oscillating unit that generates a frequency different from the first oscillating unit, and a frequency output from the second oscillating unit. A reception unit that uses a predetermined value and a deviation amount calculated by the counting unit when performing wireless communication, and a counting unit that calculates the deviation amount of the first oscillation unit based on a quantity And a wireless communication unit that generates a signal to be received using the reception frequency output from the calculation unit and the frequency output from the first oscillation unit. Wireless communication equipment.

  As a result, the wireless communication device can receive with a highly accurate frequency.

  The third invention counts and outputs the signal period generated from the first oscillation part based on the signal period generated from the second oscillation part, particularly in the counting part of the first or second invention. Is.

  As a result, the absolute deviation amount of the oscillation amount of the first oscillation unit can be grasped, and transmission / reception can be performed at a high-accuracy frequency based on the amount.

  In the fourth invention, in particular, in the counting section of the first or second invention, the frequency of the signal generated from the first oscillation section is counted and output based on the signal period generated from the second oscillation section. To do.

  As a result, the absolute deviation amount of the oscillation amount of the first oscillation unit can be grasped, and transmission / reception can be performed at a high-accuracy frequency based on the amount.

  In addition, in the fifth invention, particularly in the counting unit of the first or second invention, the difference between the signal cycle generated from the second oscillation unit and the signal cycle generated from the first oscillation unit is counted and output. To do.

  As a result, the absolute deviation amount of the oscillation amount of the first oscillation unit can be grasped, and transmission / reception can be performed at a high-accuracy frequency based on the amount.

  Embodiment 1 of the present invention will be described below with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
A radio communication system according to an embodiment of the present invention will be described. FIG. 1 is an example of a configuration diagram of a wireless communication device according to an embodiment of the present invention.

  The wireless communication device 100 determines in advance the oscillation unit 101 that is based on the transmission frequency and reception frequency in wireless communication, the transmission / reception frequency, transmission output, output data, frequency shift amount, transmission rate, modulation method, and the like during wireless communication. The calculation unit 102 that generates data according to the specified protocol, performs signal processing based on the data generated by the calculation unit 102, generates a signal for transmission, or transmits from the outside of the wireless communication device 100 The high-frequency unit 103 for receiving the transmitted signal, and the output of the signal generated by the high-frequency unit 103 are the communication unit 104 for receiving the signal transmitted from the outside, and the source of the transmission / reception frequency of wireless communication In addition to the oscillation unit 101, the reference oscillation unit 111 that generates the reference frequency, the frequency divider 110 that divides the reference frequency of the oscillation unit 101, and the reference oscillation The reference frequency divider 112 for dividing the frequency of 111, and the counter 113 for counting the output frequency of the oscillation unit 101 using the output signals of the frequency divider 110 and the reference frequency divider 112. ing.

  Here, the oscillation unit 101 is an oscillation circuit configured using a ceramic resonator, a crystal resonator, or a discrete component in accordance with a frequency used for wireless transmission / reception. In particular, when the oscillating unit 101 is composed of a crystal resonator, the temperature characteristics vary depending on the cut angle of the crystal piece used in the crystal resonator, the density, size, and elastic modulus of the crystal piece.

  On the other hand, the vibration mode is determined to some extent depending on the frequency to be obtained. In general, from a few hundred kilohertz to a few hundred megahertz, a crystal cutting method called AT cut is used to vibrate in a thickness-shear vibration mode. In this embodiment, an AT-cut crystal piece is used. The temperature characteristics of this AT-cut quartz crystal piece are generally cubic characteristics as shown in FIG. Further, the temperature characteristic of the transmission / reception frequency of the wireless communication device 100 using this crystal resonator also exhibits a characteristic as shown in FIG.

  The AT-cut temperature characteristic curve is relatively flat at a temperature around 25 ° C. However, as the cut angle of the AT cut is changed, the change width of the temperature characteristic also changes, and the direction of change also shifts to both the positive side and the negative side. In addition, the change width increases as the distance from the inflection point increases. Since the cut angle depends on the manufacturing apparatus, the cut angle varies to some extent, and the variation amount affects the temperature characteristics.

  On the other hand, the reference oscillating unit 111 is an oscillation circuit configured using a crystal resonator, like the oscillating unit 101. For the reference oscillating unit 111, for example, an NТ cut in which the vibration mode is a contour sliding mode, For CT cut, DT cut, SL cut, and flex mode, use a crystal resonator using a crystal piece processed with XY cut and NT cut, GT cut for comprehensive mode, and X cut for extension mode. I will do it. The temperature characteristics of the crystal piece cut by each method are different from the temperature characteristics of the AT-cut lens, and have a quadratic curve characteristic as shown in FIG. Since the quartz crystal manufactured by the NT cut or the X cut generally has a parabola with an apex around 25 ° C. and a convex shape, the frequency deviation when the temperature changes is shown. The amount of change varies greatly. However, the degree of freedom in deciding the temperature characteristic curve position is small, and the apex temperature is determined almost by the dimensions of the crystal piece designed, so the temperature characteristic can be easily predicted.

  Next, system processing during communication in the wireless communication device 100 of the present invention will be described.

  When the wireless communication device 100 shown in FIG. 1 transmits, a transmission frequency is generated based on a predetermined protocol. For example, the frequency is calculated based on the following equation.

F (transmission / reception frequency) = ch (communication channel) × d (channel span) + f0 (reference communication frequency).

  In the predetermined protocol, the frequency band to be transmitted and received and the span of the channel are determined, and the communication channel ch is multiplied from the frequency of the reference communication frequency f0 in consideration of the channel span d according to the communication channel. Determine the communication channel. The generation of these frequencies is realized by dividing or multiplying the signal of the oscillation unit 101 in the wireless communication device 100. Therefore, if the signal generated by the oscillation unit 101 changes due to the influence of the ambient temperature or the like, the value of the transmission / reception frequency F also changes.

  Here, the communication channel and channel span are determined by a predetermined protocol and are relatively determined amounts, whereas the reference frequency f0 is a reference in calculating the communication channel and channel span. Therefore it becomes an absolute amount.

  Hereinafter, a method for calculating the deviation amount of the oscillation unit 101 from the reference frequency will be described.

  First, when transmitting, in order to calculate the deviation amount of the oscillation frequency of the oscillation unit 101, the signal output from the oscillation unit 101 is divided by the frequency divider 110 and input to the counter 113. The counter 113 uses the reference frequency generated by the reference oscillation unit 111 and divided by the reference frequency divider 112 as the reference frequency for counting. Here, the reference oscillation generated by the reference oscillation unit 111 uses an oscillation circuit having high stability or one having a known temperature characteristic. Further, in the counting unit, for example, when counting is performed directly, the signal output from the reference frequency divider 112 is used as a gate signal to count the wave number of the signal input from the frequency divider 110, or the frequency divider You may count using the reciprocal system etc. which measure 110 circumference | surroundings directly. Further, here, in order to detect the amount of deviation of the oscillation frequency of the oscillation unit 101, the object to be measured is the frequency division of the oscillation unit 101, and the reference frequency for counting is the frequency division of the reference oscillation unit 111. When counting, this can also be calculated in reverse.

  Subsequently, the calculated shift amount is added as an amount for fine adjustment with respect to the reference communication frequency f0 when the calculation unit 102 calculates the transmission / reception frequency F.

  Next, the processing flow of the wireless communication device 100 configured as described above according to the embodiment of the present invention will be described with reference to FIG. FIG. 3 shows an operation flow at the time of transmission of radio communication apparatus 100 according to the present embodiment.

  In the wireless communication device 100, in order to perform transmission at a predetermined time, first, the oscillation unit 101 and the reference oscillation unit 111 are set to a normal oscillation operation, and the respective outputs are respectively sent to the frequency divider 110 and the reference frequency divider 112. Input (S301). In step S301, the output of the oscillating unit 101 and the output of the reference oscillating unit 111 are respectively divided into appropriate frequencies to prepare a signal to be input to the counter 113.

  Next, the output of the frequency divider 110 and the output of the reference frequency divider 112 are input to the counter 113. Then, the frequency counting operation of the frequency divider 110 is performed using the reference frequency divider 112 as a reference (S302). In step S302, the frequency deviation amount of the oscillation unit 101 is calculated using the counter 113.

  Subsequently, in S302, the result of the counting operation is the output of the frequency deviation amount of the oscillating unit 101, which is input to the calculation unit 102 to calculate the correction amount for the frequency deviation amount. The correction amount is calculated by preparing a function that reverses the sign with respect to the deviation amount, for example (S303). That is, S303 is a step for performing a calculation for calculating a correction amount for correcting the frequency deviation of the oscillation unit 101.

  Next, the transmission frequency setting is determined. This is performed by the arithmetic unit 102, and the setting is determined according to the communication protocol after determining the transmission span, transmission channel, frequency deviation amount, transmission output, modulation type, data to be transmitted, etc. The correction amount calculated in S303 is added to the reference transmission frequency f0 to determine the setting of the transmission frequency F (S304). In S304, it corresponds to a step of generating information necessary for transmission from the wireless communication device 100 and setting a register.

  Further, based on the transmission frequency F set in S304, data determined in advance is modulated by the high frequency unit 103, and transmitted from the communication unit 104 using an antenna or the like (S305). In step S305, the communication unit 104 is operated based on the register set in step S304 to generate a signal and output the signal.

  The above operation flow at the time of transmission can be adapted to the operation at the time of reception. At the time of reception, at the predetermined time, the reception frequency is corrected as in steps S301 to S304 in the above flow, and the communication unit 104 uses the reception frequency F generated based on the calculated correction amount. This can be realized by demodulating the received signal by the high frequency unit 103.

  As described above, the wireless communication device 100 counts the amount of deviation of the oscillation unit 101 for generating the frequency at the time of transmission / reception based on another reference oscillation unit 111, and uses that amount to determine the transmission / reception frequency at the time of communication. By correcting the frequency, it is possible to generate the frequency with high accuracy with a simple configuration.

(Embodiment 2)
FIG. 4 shows an internal configuration diagram of a radio communication apparatus according to Embodiment 2 of the present invention. A description of a configuration having the same functions as those in Embodiment 1 is omitted, and only the recording unit 114, the temperature detection unit 115, and the calculation unit 102 in the wireless communication device 100 different from those in FIG.

  The recording unit 114 has a function of storing temperature characteristic data of the reference oscillation unit 111 and individual difference data of the oscillation unit 101. When the reference oscillation unit 111 has a temperature characteristic and the temperature characteristic is known in advance, the characteristic is held in the recording unit, the reference oscillation unit 111 is divided by the reference frequency divider 112, and the counter In 113, correction is performed with a gate time when the frequency of the oscillation unit 101 is counted or a temperature characteristic recorded in the recording unit 114 at the time of counting.

  The data recorded in the recording unit 114 may have one offset value of a certain value if, for example, the reference oscillation unit 111 has an individual difference due to the influence of a component circuit or a used component. It is good, and it is not a constant offset amount such as temperature characteristics, but is stored as a data or a function of a plurality of points as long as it is a variable amount.

  Here, an example of the temperature characteristic of the reference oscillation unit 111 is shown in FIG. Since the temperature characteristic of the reference oscillation unit 111 shown in FIG. 5 is given by quadratic curve data, it is given by curve coefficient data, and the individual difference is given by Δf at the temperature T0. By holding these data and correcting the temperature data detected by the temperature detection unit 115 described later by the calculation unit 102, it is possible to absorb the temperature characteristics and individual differences of the reference oscillation unit 111.

  In general, the oscillation unit used for the reference oscillation unit 111 can be configured to have a small individual difference in temperature characteristics. Therefore, when manufacturing the wireless communication device 100, the temperature characteristic of the reference oscillation unit 111 can be reduced. The recording unit 114 may be recorded by measuring the coefficient of the function and Δf at a predetermined temperature T0.

  Next, the temperature detection unit 115 will be described. The temperature detector is composed of what is generally called a thermistor element such as an NTC thermistor or PTC thermistor, a semiconductor element, a combination of metal and ceramic, or a passive element having temperature characteristics. It has a function to detect. In order to detect the temperature more accurately, an element having temperature characteristics may be arranged as close as possible to the reference oscillation unit 111 that is the object to be measured.

  Next, the calculation unit 102 will be described. In the first embodiment, the outputs of the oscillating unit 101 and the reference oscillating unit 111, or the respective outputs are once divided by the frequency divider 110 and the reference frequency divider 112 and then input to the counter 113. The frequency deviation amount was counted, a correction amount for the deviation amount of the oscillating unit 101 was calculated based on the value, and reflected in the frequency setting register used for the transmission / reception operation of the wireless communication device 100.

  Here, these functions are similarly provided, and in addition, there is an action of correcting individual differences and temperature characteristics of the reference oscillation unit 111. Here, correction of the latter reference oscillation unit 111 will be described.

  As described above, the temperature detection unit 115 is disposed in the vicinity of the reference oscillation unit 111, and the temperature data acquired by the temperature detection unit 115 is captured by the calculation unit 102. As a capturing method, discrete value conversion may be directly input to the calculation unit 102, or a circuit such as an external comparator is prepared, and a value detected by the temperature detection unit 115 is a predetermined value. It may be a method of detecting when the value exceeds. As described above, the acquired temperature data is collated with a function of the frequency deviation amount with respect to the temperature recorded in the recording unit 114 or table data, and the frequency deviation amount with respect to the temperature data is calculated.

  On the other hand, the frequency data or clock data of the reference oscillation unit 111 is also taken into the recording unit 114 via the reference frequency divider 112, and a correction operation is performed based on the already calculated frequency deviation amount.

  The corrected frequency data or clock data is then input to the counter 113 to provide a more accurate reference frequency.

  With the configuration of the recording unit 114, the temperature detection unit 115, and the calculation unit 102 as described above, the frequency deviation amount of the reference oscillation unit 111 output or the frequency-divided output can be corrected, and the counting can be performed more accurately. The output of the oscillator 101 can be counted by the device 113.

  In the above configuration, the method of capturing the frequency data of the reference oscillating unit 111 into the arithmetic unit 102 has been described. However, the output of the reference oscillating unit 111 or the divided output thereof is first captured in the counter 113 and the oscillating unit. When the temporary frequency deviation of 101 is counted and the counting result is used as the calculation unit, the characteristic data stored in the recording unit 114 is referred to based on the temperature detected by the temperature detecting unit 115, and the counting result is corrected. Also good.

  With the configuration as described above, the temperature characteristics and variations of the reference oscillation unit 111 are recorded in the recording unit 114 in advance, and when the wireless communication device 100 transmits and receives, the temperature detection unit 115 uses the reference oscillation unit 111 in the wireless device 2. If the oscillation frequency of the reference oscillation unit 111 is corrected using the data in the recording unit 114 after measuring the temperature in the vicinity of or the ambient temperature, the counter 113 counts more when the output of the oscillation unit 101 is counted. It is possible to count with high accuracy.

  Next, a processing flow of the wireless communication device 100 configured as described above according to the embodiment of the present invention will be described with reference to FIG. FIG. 6 shows an operation flow at the time of transmission of radio communication apparatus 100 according to the present embodiment.

  In order to perform transmission at a predetermined interval in radio communication apparatus 100, first, processing for correcting temperature variation and individual variation of the frequency output from reference oscillation unit 111 is performed. For this purpose, the temperature detection unit 115 is activated to detect the temperature of the reference oscillation unit 111 or its surroundings (S601). In step S601, the temperature detecting unit 115 detects the surface temperature of the reference oscillating unit 111 and obtains data for grasping which temperature point of the temperature characteristics of the reference oscillating unit 111 is operating. become.

  Next, the calculation unit 102 calculates a correction amount at the detected temperature based on the detection value obtained by the temperature detection unit 115. As a calculation method, calculation is performed using a table in which a correction amount for temperature recorded in advance in the recording unit 114 or a function for calculating a correction amount for temperature is used.

  For example, when using a function for calculating a correction amount for temperature, the recording unit 114 records a coefficient of a function including variations such as individual differences of the reference oscillation unit 111 and temperature characteristics. For example, with respect to the correction amount Δf, the correction amount can be calculated by (t−p) ^ 2 + q.

  Here, t is a detected temperature, and p and q are coefficients representing individual differences and temperature characteristics of the reference oscillation unit 111. Further, since the correction amount Δf is output as a frequency or a frequency deviation, it is converted into a time dimension such as a period (S602). In step S602, the individual variation or temperature of the reference oscillation unit 111 stored in advance in the recording unit 114 based on the operating temperature point obtained by measuring the surface temperature of the reference oscillation unit 111 obtained in step S601. Using a function that expresses characteristics, a conversion table, etc., calculates the frequency deviation, and based on this, calculates the frequency deviation of the individual difference and the temperature characteristic of the reference oscillation unit 111, and outputs the correction amount Do.

  Next, the output of the frequency divider 110 and the output of the reference frequency divider 112 are input to the counter 113 (S603). The process of step S603 is an operation of optimizing the frequency according to the capacity of the counting process to be performed later. If the capacity of the counter 113 is high, it is not necessary to use a frequency divider and it may be input directly. If the capacity of the counter 113 is not high, processing is performed to divide the frequency output from each oscillation unit by an appropriate numerical value and lower the frequency.

  Subsequently, the output of the reference frequency divider 112 is once corrected in consideration of the correction amount calculated in step S602 (S604). In step S604, a process for correcting the frequency deviation amount of the output of the reference frequency divider 112 is performed. For example, the reference frequency divider 112 is taken into the calculation unit 102, converted into period information, added with the correction amount calculated in step S602, and then output again.

  After that, the frequency-divided output of the reference frequency divider 112 corrected in step S603 and the output of the frequency divider 110 are input to the counter 113 to perform a counting operation (S605).

  In step S605, the frequency division output of the oscillation unit 101 is counted based on the reference oscillation frequency output corrected in step S604. However, counting can be performed even if this criterion is reversed.

As a result of the counting operation in step S605, the deviation amount of the oscillation unit 101 is output. This output is input to the calculation unit 102, and a correction amount for the deviation amount of the oscillation unit 101 is calculated. The correction amount is calculated by preparing a function that reverses the sign with respect to the deviation amount, for example. Next, the transmission frequency setting is determined. This is performed by the calculation unit 102, and the setting determines the transmission span, transmission channel, transmission output, etc. according to the communication protocol, and then adds the correction amount calculated in step S606 to the reference transmission frequency f0. Then, the setting of the transmission frequency F is determined (S606).

  As the correction amount calculated in step S606, a frequency deviation of the oscillation unit 101 is calculated from the counting result, and a correction amount for correcting the frequency deviation is calculated. This correction amount is not a correction amount for directly correcting the oscillation unit 101 but a value for correcting the setting amount of the channel setting register for setting the transmission / reception channel to be transmitted / received in the wireless communication device 100.

  Based on the transmission frequency F set in step S606, data determined in advance is modulated by the high frequency unit 103, and transmitted from the communication unit 104 using an antenna or the like (S607).

  The above operation flow at the time of transmission can be adapted to the operation at the time of reception. At the time of reception, the reception frequency is corrected as in steps S601 to S607 of the above flow at a predetermined time, and the signal received by the communication unit 104 based on the received reception frequency F is converted to the high frequency unit 103. This can be realized by performing demodulation.

  As described above, the wireless communication device 100 counts the amount of deviation of the oscillation unit 101 for generating the frequency at the time of transmission / reception based on another reference oscillation unit 111, and uses that amount to determine the transmission / reception frequency at the time of communication. By correcting, it is possible to generate with a simple configuration and high accuracy.

  In the present invention, it is possible to easily generate highly accurate oscillation by providing a configuration for correcting the transmission / reception frequency of the wireless communication device by itself.

1 is an internal configuration diagram of a wireless communication device according to a first embodiment of the present invention. Temperature characteristics of the oscillator Operation flow diagram at the time of transmission of the wireless communication device according to the first embodiment of the present invention The internal block diagram of the radio | wireless communication apparatus of Embodiment 2 of this invention Reference oscillator temperature characteristics diagram The internal block diagram of the radio | wireless communication apparatus of Embodiment 2 of this invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Wireless communication apparatus 101 Oscillation part 102 Operation part 103 High frequency part 104 Communication part 110 Frequency divider 111 Reference oscillation part 112 Reference frequency divider 113 Counter 114 Recording part 115 Temperature detection part

Claims (4)

An oscillation unit for generating a source oscillation of a frequency during communication;
A reference oscillation unit for generating a frequency different from that of the oscillation unit;
A storage unit for storing a coefficient of a temperature function indicating a temperature characteristic of a frequency shift amount generated by the reference oscillation unit;
A temperature detection unit for measuring the temperature of the reference oscillation unit;
A calculation unit for correcting the frequency of the reference oscillation unit and the frequency of the oscillation unit ;
A counting unit for calculating a shift amount of the oscillation portion,
A communication unit that transmits data at a transmission frequency determined using a predetermined protocol for the frequency of the oscillation unit corrected in the arithmetic unit ,
The calculation unit outputs and corrects the frequency deviation amount of the reference oscillation unit from the temperature characteristics recorded in the recording unit and the temperature measured by the temperature detection unit,
After the counting unit calculates the deviation amount of the oscillation unit based on the corrected frequency of the reference oscillation unit, the calculation unit uses the deviation amount to correct the frequency of the oscillation unit. Communication machine. The wireless communication device according to claim 1, wherein the counting unit counts and outputs a signal cycle generated from the oscillation unit based on a signal cycle generated from the reference oscillation unit. The wireless communication device according to claim 1, wherein the counting unit counts and outputs a frequency of a signal generated from the oscillation unit based on a signal cycle generated from the reference oscillation unit. The wireless communication device according to claim 1, wherein the counting unit counts and outputs a difference between a signal cycle generated from the reference oscillation unit and a signal cycle generated from the oscillation unit.