JP6680615B2 - Adjusting device, adjusting method, and oscillating device - Google Patents

Description

  The present invention relates to an adjusting device, an adjusting method, and an oscillator.

Conventionally, an oscillation circuit that oscillates a vibrator adjusts the oscillation frequency using a compensation circuit that compensates for the temperature characteristic of the oscillation frequency of the vibrator (see, for example, Patent Documents 1 and 2).
Patent Document 1 Japanese Unexamined Patent Publication No. 11-68461, Patent Document 2 Japanese Unexamined Patent Publication No. 2006-74288

  However, since the oscillator has a high-order frequency temperature characteristic component, and the frequency temperature characteristic component varies uniquely to the element, it is difficult to accurately compensate the temperature characteristic. In such an oscillator circuit, for example, it is difficult to compensate the temperature characteristic within ± 0.1 ppm to a frequency stability equivalent to that of a crystal oscillator with an oven (OCXO) (OCXO: Open Controlled Crystal Oscillator).

  In the first aspect of the present invention, there is provided an adjusting device for adjusting a control voltage of an oscillator, comprising: a first adjusting unit for adjusting an output of the temperature detecting unit; and an output of the temperature detecting unit adjusted by the first adjusting unit. Accordingly, a first temperature compensating unit that outputs a first temperature compensating signal that temperature-compensates the oscillator, a second adjusting unit that adjusts the output of the temperature detecting unit independently of the first adjusting unit, and a second adjusting unit are provided. In accordance with the adjusted output of the temperature detecting unit, a second temperature compensating unit that outputs a second temperature compensating signal that temperature-compensates the oscillator and a first temperature compensating signal and a second temperature compensating signal are added to output a control voltage. An adjusting device including:

  According to a second aspect of the present invention, there is provided an adjusting method of adjusting a control voltage of an oscillator, comprising: first adjusting an output of a temperature detecting unit; and adjusting the output of the temperature detecting unit according to the first adjustment. To output a first temperature compensation signal for temperature compensation, to adjust the output of the temperature detection unit to the second adjustment independently of the first adjustment, and to output the oscillator according to the output of the second adjusted temperature detection unit. There is provided an adjusting method comprising: outputting a second temperature compensation signal for temperature compensation; and adding a first temperature compensation signal and a second temperature compensation signal to output a control voltage.

  According to a third aspect of the present invention, an oscillator having an oscillator, a temperature detecting unit for detecting the temperature of the oscillator, an adjusting device according to the first aspect, and a frequency according to a control voltage output by the adjusting device. And an oscillation circuit that oscillates the oscillator.

  Note that the above summary of the invention does not enumerate all the necessary features of the invention. Further, a sub-combination of these feature groups can also be an invention.

A configuration example of the oscillator 1000 according to the present embodiment is shown. An example of temperature characteristics of the oscillation frequency of the vibrator 10 according to the present embodiment will be shown. An example of the temperature characteristic of the oscillation frequency of the vibrator 10 having the variation of the inflection point will be shown. An example of the control voltage V _C of the temperature sensor having variations in detection sensitivity is shown. A configuration example of the adjustment device 100 according to the present embodiment is shown together with the temperature detection unit 40 and the reference voltage generation unit 50. The modification of the adjusting device 100 which concerns on this embodiment is shown.

  Hereinafter, the present invention will be described through embodiments of the invention, but the following embodiments do not limit the invention according to the claims. In addition, not all of the combinations of features described in the embodiments are essential to the solving means of the invention.

  FIG. 1 shows a configuration example of an oscillator 1000 according to this embodiment. The oscillator 1000 compensates the temperature characteristic of the oscillation frequency of the oscillator to the same degree as that of a crystal oscillator with a constant temperature oven. The oscillation device 1000 includes the vibrator 10, the oscillation circuit 20, the temperature detection unit 40, and the adjustment device 100.

  The vibrator 10 is an element that oscillates by a piezoelectric effect that is deformed by application of an electric field. The oscillator 10 is, for example, a crystal oscillator in which a crystal is provided between two electrodes. The oscillator 10 may be capable of adjusting the oscillation frequency according to the capacity of the connected circuit. The vibrator 10 may be formed by being cut in an orientation called AT. The oscillation frequency of the vibrator 10 changes according to the temperature of the vibrator 10. Further, the oscillation frequency of the vibrator 10 varies from one vibrator 10 to another. The oscillator 1000 adjusts the oscillation frequency of the vibrator 10.

  The oscillator circuit 20 is connected to the oscillator 10, oscillates the oscillator 10 at a frequency according to the control voltage, and outputs the oscillated frequency signal to the outside. The oscillator circuit 20 may use the vibrator 10 as a resonator. Further, the oscillator circuit 20 may include a variable capacitance element that is connected to the vibrator 10 and that changes its capacitance in accordance with the input control voltage, and may change its oscillation frequency in accordance with the change in capacitance. The vibrator 10 and the oscillation circuit 20 as described above function as an oscillator 30 that oscillates at a frequency according to the control voltage. The oscillator 30 is, for example, a VCXO (Voltage Controlled Xtal Oscillator).

  The temperature detector 40 detects the temperature of the vibrator 10. The temperature detector 40 may include one or a plurality of temperature sensors that detect the temperature around the vibrator 10. The temperature sensor may contact the vibrator 10 to detect the temperature of the vibrator 10, or may instead detect the temperature of the vibrator 10 in a non-contact manner.

  The adjustment device 100 adjusts the control voltage of the oscillator 30 according to the detection result of the temperature detection unit 40. The adjusting device 100 adjusts the control voltage so as to compensate the temperature characteristic of the vibrator 10. Next, the temperature characteristics of the vibrator 10 adjusted by the adjusting device 100 will be described.

FIG. 2 shows an example of temperature characteristics of the oscillation frequency of the vibrator 10. The horizontal axis of FIG. 2 represents temperature and the vertical axis represents oscillation frequency. A curve A in FIG. 2 shows an example of the temperature characteristic of the AT-cut vibrator 10, and has a characteristic that can be approximated to a temperature by a cubic function called a Bechmann curve. For example, in the vibrator 10 having the reference frequency f _{0 at} the reference temperature T ₀ , the oscillation frequency fluctuates in the range of f ₀ −f ₁ to f ₀ + f ₁ in the temperature range of T ₀ −ΔT to T ₀ + ΔT. That is, the reference temperature T ₀ is an inflection point of the temperature characteristic. As an example, the oscillator 10 has a fluctuation of about 15 ppm in the range of -40 ° C to 90 ° C.

By obtaining such temperature characteristics of the vibrator 10 in advance by measurement or the like, the adjustment device 100 can compensate for fluctuations in the oscillation frequency of the vibrator 10. The adjusting device 100 uses, for example, a curve B having an inverse characteristic of the curve A, and adds a frequency correction value corresponding to a point on the curve B with respect to the detected temperature. The adjusting device 100 adjusts the control voltage, for example, to obtain the difference between the frequency f _B (T) on the curve B and the frequency f _A (T) on the curve A with respect to the temperature T detected by the temperature detecting unit 40. Only change the oscillation frequency. As a result, the adjusting device 100 can stabilize the oscillation frequency of the vibrator 10 to a substantially constant frequency as indicated by the straight line C.

The frequency-temperature characteristic of the vibrator 10 can be expressed by the following equation, for example. The frequency of the vibrator 10 is f, the frequency fluctuation width is Δf (= f−f ₀ ), and A ₃ , A ₁ , and A ₀ are coefficients. Further, although the expression (1) is an example in which the frequency-temperature characteristic is represented by a cubic function of the temperature T, a higher-order component may be added to improve the approximation accuracy.

Here, consider a case where the control voltage of the oscillator 30 is V _C and the control voltage-oscillation frequency characteristic can be approximated by the formula (2). In this case, if the adjusting device 100 can adjust the control voltage V _{C according} to the equation (3), the temperature characteristic of the oscillation frequency can be canceled and compensated as described in FIG.

Note that B ₃ , B ₁ , and B ₀ are coefficients, and in this case, the adjusting device 100 causes A ₃ = −α · B ₃ , A ₁ = −α · B ₁ , and A ₀ = −α · B. _The control voltage V _C is adjusted so that it becomes _zero .

By adjusting the adjusting device 100 as described above, the temperature characteristic of the oscillation frequency can be improved. However, since the actual oscillation device 1000 has variations in the characteristics of the elements included in the device, even if the adjustment device 100 adjusts the control voltage V _{C according} to the formula (3), higher accuracy is achieved. It is difficult to realize stable operation.

  For example, the vibrator 10 may have inflection point variations, and the temperature sensor of the temperature detection unit 40 may have detection sensitivity variations. The variation inherent in these elements has been a factor that deteriorates the stability of the oscillation frequency.

For example, since the sensitivity of the temperature sensor has a first-order temperature characteristic with respect to the temperature T, the output Vtsens (T) of the temperature sensor can be expressed by the equation (4). Note that a and b are coefficients unique to the temperature sensor. In this case, the control voltage V _{C in the} equation (3) is expressed as in the equation (5).

On the other hand, when variation occurs in the inflection point T ₀ of the vibrator 10, the temperature of the variation is ΔT ₀ , the equation (1) can be expressed as the equation (6). Further, the control voltage V _C corresponding to the frequency-temperature characteristic of the vibrator 10 of the formula (6) can be expressed as the formula (7).

FIG. 3 shows an example of the temperature characteristic of the oscillation frequency of the vibrator 10 having the variation of the inflection point as shown by the equation (6). In FIG. 3, the horizontal axis represents temperature and the vertical axis represents the fluctuation rate Δf / f of the oscillation frequency. The solid line in FIG. 3 shows an example of the temperature characteristic when the inflection point T ₀ is 28 ° C., and the dotted line shows an example of the temperature characteristic when the inflection point T ₀ is 33 ° C. Such variation in the inflection point T ₀ of the vibrator 10 corresponds to a shift in the horizontal axis direction when considered in the graph of temperature-oscillation frequency as shown in FIG.

As in the example of FIG. 3, it can be seen that the oscillation frequency fluctuates by several ppm with respect to the deviation of the inflection point T ₀ by 5 ° C. When such a deviation of the inflection point T ₀ occurs, it becomes difficult to perform temperature compensation of the fluctuation with high accuracy even if the adjusting device 100 outputs the control voltage V _C shown in the equation (3). Will end up. That is, it is desirable that the adjusting device 100 output the control voltage V _C shown in the formula (7) instead of the formula (3).

When the inflection point T ₀ of the vibrator 10 varies in this way, the output Vtsens (T) of the temperature sensor of the formula (4) can be expressed as the formula (8). Therefore, the control voltage V _{C of the} expression (7) is expressed as the expression (9).

Here, the equation (8) can be expanded and transformed as the following equation.

By comparing the equation (10) and the equation (4), it can be seen that the shift of the inflection point T ₀ causes a term of −a · ΔT _{0 in} the output Vtsens (T) of the temperature sensor. That is, the shift of the inflection point T ₀ of the vibrator 10 causes a DC offset voltage to be generated in the output Vtsens (T) of the temperature sensor. Therefore, the adjusting device 100 can reduce the influence of the shift of the inflection point T ₀ of the vibrator 10 by adjusting the DC offset voltage of the temperature sensor.

The temperature sensor may have a variation in the primary temperature characteristic gradient, that is, the temperature detection sensitivity. Since the sensitivity of the temperature sensor is the slope a of the formula (4), when the variation Δa occurs in the slope a, the formula (4) is expressed by the following formula.

The following formula is calculated by calculating Vtsens (T) -b from the formula (11) and substituting it into the formula (9). That is, it can be seen that when the variation Δa occurs in the detection sensitivity a of the temperature sensor, the control voltage V _C varies according to Δa.

FIG. 4 shows an example of the control voltage V _C of the temperature sensor having variations in detection sensitivity. In FIG. 3, the horizontal axis represents temperature and the vertical axis represents control voltage V _C. The solid line in FIG. 4 shows an example of the control voltage V _C when the detection sensitivity variation Δa is 0 ((a + Δa) / a: 100%). The dotted line shows an example of the control voltage V _C when the detection sensitivity variation Δa is 0.05a ((a + Δa) / a: 105%). It can be seen that when a variation Δa of about 5% occurs in the detection sensitivity a of the temperature sensor, the control voltage V _C may vary up to 30%.

Therefore, the adjusting device 100 according to the present embodiment adjusts the control voltage V _C so as to compensate for such element-specific variations and stabilize the frequency stability of the oscillator 30 with high accuracy. Such an adjusting device 100 will be described next.

FIG. 5 shows a configuration example of the adjustment device 100 according to the present embodiment, together with the temperature detection unit 40 and the reference voltage generation unit 50. FIG. 5 shows an example in which the temperature detection unit 40 has one first temperature sensor 42 that detects the temperature of the oscillator 30. In addition, an example is shown in which the reference voltage generation unit 50 that outputs a predetermined reference voltage is provided outside the adjustment device 100. The adjusting device 100 outputs the control voltage V _C that stabilizes the oscillator 30 with high accuracy based on the temperature detection result of the first temperature sensor 42 and the reference voltage of the reference voltage generating unit 50. The adjusting device 100 includes a first adjusting unit 110, a first temperature compensating unit 120, a second adjusting unit 130, a second temperature compensating unit 140, and an adding unit 150.

The first adjustment unit 110 adjusts the output of the temperature detection unit 40. The first adjustment unit 110 adjusts at least one of the detection sensitivity and the offset of the first temperature sensor 42. In the present embodiment, an example will be described in which the first adjustment unit 110 adjusts the offset voltage of the first temperature sensor 42. That is, the first adjustment unit 110 adjusts the variation ΔT ₀ of the inflection point of the vibrator 10 by adjusting the offset voltage −a · ΔT ₀ of the first temperature sensor 42 as expressed by the equation (10). To do.

  At least a part of the adjustment amount of the first adjustment unit 110 may be adjustable from the outside. It is desirable that the first adjustment unit 110 be able to externally adjust the adjustment amount of at least one of the detection sensitivity of the first temperature sensor 42 and the offset voltage. For example, the first adjustment unit 110 has an adjustment circuit that adjusts the adjustment amount of at least one of the detection sensitivity and the offset voltage according to a control signal from the outside. Instead of this, the first adjustment unit 110 has a storage unit that stores a plurality of adjustment amounts in advance, and a selection circuit that selects one adjustment amount according to a control signal from the outside and adopts it as the adjustment amount. May have.

The first temperature compensating unit 120 outputs a first temperature compensation signal for compensating the temperature of the oscillator 30 according to the output of the temperature detecting unit 40 adjusted by the first adjusting unit 110. The first temperature compensation unit 120 generates and outputs a first temperature compensation signal that compensates for the temperature characteristic of the vibrator 10 based on the output of the first adjustment unit 110 that has adjusted the variation ΔT ₀ of the inflection point. The first temperature compensation unit 120 outputs a first temperature compensation signal for temperature compensating the oscillator 30 in the temperature range from the first temperature to the second temperature. As an example, the first temperature is -40 ° C and the second temperature is + 90 ° C.

  The first temperature compensation unit 120 outputs a signal having an nth-order temperature-voltage characteristic with the reference temperature as an origin, as a first temperature compensation signal. For example, the first temperature compensation unit 120 includes a plurality of generation circuits that generate signals having temperature-voltage characteristics of different orders, and one generation circuit of the plurality of generation circuits has a third-order temperature-voltage characteristic. Output the signal having. The first temperature compensating unit 120 generates and outputs a signal having at least a third-order temperature-voltage characteristic, and cancels the temperature characteristic of the vibrator 10 as described with reference to FIG. Further, it is desirable that the first temperature compensation unit 120 generate and output a signal having temperature-voltage characteristics of a plurality of orders other than the third order.

  FIG. 5 is an example in which the first temperature compensating unit 120 includes a zeroth component generating circuit 121, a first component generating circuit 122, a third component generating circuit 123, a fourth component generating circuit 124, and a fifth component generating circuit 125. Indicates. The 0th component generation circuit 121 generates and outputs a signal component having a zero-order temperature-voltage characteristic. The first component generation circuit 122 generates and outputs a signal component having a primary temperature-voltage characteristic. Similarly, the third component generation circuit 123, the fourth component generation circuit 124, and the fifth component generation circuit 125 generate and output signal components having third-order, fourth-order, and fifth-order temperature-voltage characteristics, respectively. . The first temperature compensation unit 120 may include a circuit that generates and outputs a signal component having a sixth-order or higher temperature-voltage characteristic.

  The 0th component generation circuit 121 to the 5th component generation circuit 125 may generate signal components of respective orders based on the reference voltage from the reference voltage generation unit 50. Further, the 0th component generation circuit 121 to the 5th component generation circuit 125 respectively output signal components according to the corresponding orders in the temperature range from the first temperature to the second temperature.

  Note that the first temperature compensation unit 120 shown in FIG. 5 does not include a generation circuit that generates and outputs a signal component having a secondary temperature-voltage characteristic. Since the secondary component is a component that is reduced by the adjustment of the first adjusting unit 110, when the adjustment by the first adjusting unit 110 is sufficient, the generation circuit that generates the signal component of the secondary temperature-voltage characteristic is You can omit it. The first temperature compensation unit 120 may output a plurality of signal components respectively output from the zeroth component generation circuit 121 to the fifth component generation circuit 125 as a first temperature compensation signal.

  The second adjusting unit 130 adjusts the output of the temperature detecting unit 40 independently of the first adjusting unit 110. The second adjustment unit 130 adjusts the output of the first temperature sensor 42. The second adjustment unit 130 may perform substantially the same adjustment as that of the first adjustment unit 110, or, instead of this, may perform an adjustment different from that of the first adjustment unit 110. The second adjustment unit 130 adjusts at least one of the detection sensitivity and the offset of the first temperature sensor 42.

In the present embodiment, the second adjustment unit 130 shows an example of adjusting the detection sensitivity and the offset voltage of the first temperature sensor 42. That is, the second adjustment unit 130 adjusts the offset voltage −a · ΔT ₀ of the first temperature sensor 42 as shown by the equation (10) to adjust the variation ΔT ₀ of the inflection point of the vibrator 10. . Further, the second adjustment unit 130 further adjusts the detection sensitivity Δa of the first temperature sensor 42 as shown in the equation (11).

  The second adjustment unit 130 may be able to adjust at least a part of the adjustment amount from the outside. It is desirable that the second adjustment unit 130 can adjust the adjustment amount of at least one of the detection sensitivity of the first temperature sensor 42 and the offset voltage from the outside. The second adjustment unit 130, for example, similarly to the first adjustment unit 110, an adjustment circuit that adjusts the adjustment amount according to a control signal from the outside, or a storage unit that stores a plurality of adjustment amounts in advance, and an external adjustment unit. And a selection circuit that selects one adjustment amount in accordance with the control signal.

The second temperature compensator 140 outputs a second temperature compensation signal for compensating the temperature of the oscillator 30 according to the output of the temperature detector 40 adjusted by the second adjuster 130. The second temperature compensation unit 140 receives the temperature detection result of the vibrator 10 in which the variation ΔT ₀ of the inflection point and the variation Δa of the detection sensitivity of the first temperature sensor 42 are adjusted. The second temperature compensator 140 generates and outputs a second temperature compensation signal that compensates for components that cannot be completely compensated by the first adjuster 110 and the first temperature compensator 120. That is, the second temperature compensation unit 140 generates and outputs a second temperature compensation signal different from the first temperature compensation signal.

  The second temperature compensating unit 140 generates and outputs the second temperature compensating signal by using the temperature-voltage characteristic of the order different from that of the first temperature compensating unit 120. For example, the second temperature compensating unit 140 outputs, as the second temperature compensating signal, a signal having a temperature-voltage characteristic of an order higher than the order used by the first temperature compensating unit 120. For example, when the first temperature compensating unit 120 generates the first temperature compensating signal by using the signal having the temperature-voltage characteristic of the order up to the fifth, the second temperature compensating unit 140 sets the temperature-voltage characteristic of the sixth order or higher. The second temperature compensation signal is generated using the signal that it has and is output.

  In addition, the second temperature compensation unit 140 outputs a second temperature compensation signal for temperature compensating the oscillator 30 in at least a part of the temperature range between the first temperature and the second temperature. For example, the second temperature compensating unit 140 has a plurality of compensating circuits that output a signal for compensating the temperature of the oscillator 30 in each of different temperature ranges between the first temperature and the second temperature.

  In FIG. 5, the second temperature compensating unit 140 includes a first range compensating circuit 141, a second range compensating circuit 142, a third range compensating circuit 143, a fourth range compensating circuit 144, a fifth range compensating circuit 145, and a sixth range. An example including a compensation circuit 146 and a seventh range compensation circuit 147 is shown. The first range compensating circuit 141 to the seventh range compensating circuit 147 use a signal having a temperature-voltage characteristic of a sixth order or higher in a part of different temperature ranges from the first temperature to the second temperature. Generate and output signals respectively. Each of the first range compensation circuit 141 to the seventh range compensation circuit 147 may generate a compensation signal including a plurality of orders of temperature-voltage characteristic signals.

  As an example, the first range compensation circuit 141 is in the range of -40 ° C or higher and lower than -30 ° C, the second range compensation circuit 142 is in the range of -30 ° C or higher and lower than -10 ° C, and the third range compensation circuit 143 is -10 ° C or higher. A range of less than + 10 ° C., a range of the fourth range compensating circuit 144 is + 10 ° C. or more and less than + 30 ° C., a range of the fifth range compensating circuit 145 is + 30 ° C. or more and less than + 50 ° C., and a sixth range compensating circuit 146 is + 50 ° C. or more + 70 ° C. In the lower range, the seventh range compensation circuit 147 outputs a compensation signal for temperature compensating the oscillator 30 in the range of + 70 ° C. or higher and + 90 ° C. or lower. The second temperature compensation unit 140 outputs the signals output by the plurality of compensation circuits, respectively, as the second temperature compensation signal. Although the above is an example in which the second temperature compensating unit 140 includes seven compensating circuits, the second temperature compensating unit 140 may include eight or more compensating circuits.

The addition unit 150 adds the first temperature compensation signal and the second temperature compensation signal to generate a control voltage V _C, and outputs the control voltage V _C to the oscillator 30. The addition section 150 may supply the addition result of the first temperature compensation signal and the second temperature compensation signal to the oscillation circuit 20 as the control voltage V _C.

In the adjusting device 100 according to the present embodiment described above, the first adjusting unit 110 adjusts the DC offset voltage of the first temperature sensor 42 to adjust the variation ΔT ₀ of the inflection point of the vibrator 10. Then, the first temperature compensating unit 120 uses the signal having the temperature-voltage characteristic of the fifth order or less according to the output of the first temperature sensor 42 whose DC offset voltage is adjusted, and then uses the signal having the temperature-voltage characteristic of the fifth order or less. And outputs a first temperature compensation signal that compensates for As described above, the adjustment apparatus 100 combines the adjustment of the variation ΔT ₀ of the inflection point and the compensation using the temperature-voltage characteristic of the third order and the low order close to the third order to obtain the first temperature compensation signal. Can be output.

In addition, in the adjustment device 100, the second adjustment unit 130 adjusts the DC offset voltage and the detection sensitivity of the first temperature sensor 42. Then, the second temperature compensating unit 140 uses the signal having the temperature-voltage characteristic of the sixth order or higher in accordance with the output of the first temperature sensor 42 whose DC offset voltage and detection sensitivity are adjusted, and uses the signal. The second temperature compensation signal for compensating the temperature characteristic of is generated and output. As described above, the adjustment device 100 combines the inflection point variation ΔT ₀ and the adjustment of the detection sensitivity of the first temperature sensor 42 with the compensation using the temperature-voltage characteristic of a higher order than the sixth order. Thus, the second temperature compensation signal that stabilizes the oscillator 30 within about ± 0.1 ppm can be output.

As described above, since the adjustment device 100 generates the first temperature compensation signal for roughly adjusting the temperature characteristic of the oscillator 30 and the second temperature compensation signal for fine adjustment in independent blocks, the degree of freedom in design is increased. It is possible to increase the temperature and realize highly accurate temperature compensation. For example, the adjustment device 100 generates the first temperature compensation signal by using a plurality of generation circuits that compensate the first temperature to the second temperature by a function, and the main third-order characteristic of the temperature characteristic of the vibrator 10 and Compensates for low-order characteristics. Then, the adjustment device 100 causes the higher-order fluctuation of the vibrator 10 that cannot be completely compensated by the first temperature compensation signal, the detection sensitivity of the temperature sensor, the nonlinear fluctuation with respect to the control voltage V _C unique to the oscillator 30, and the plurality of generations. The second temperature compensation signal is used to compensate the approximation error of compensation using the function of the circuit.

  Since the adjustment device 100 generates the second temperature compensation signal by using the higher-order function for each of the plurality of temperature ranges, it is possible to efficiently compensate for the higher-order and / or nonlinear minute fluctuations for each temperature range. . Further, since the adjustment device 100 generates the second temperature compensation signal by a compensation method different from that of the first temperature compensation signal, independently of the generation of the first temperature compensation signal, highly accurate compensation can be realized. it can. In addition, since the adjustment device 100 can adjust the adjustment amounts of the first temperature compensation signal and the second temperature compensation signal separately without affecting each other, the first temperature compensation signal and the second temperature compensation signal can be easily adjusted. It can be adjusted and generated. Therefore, the adjusting device 100 according to the present embodiment can easily compensate the temperature characteristics of the oscillator 30 to the frequency stability equivalent to that of the crystal oscillator with a constant temperature oven.

  FIG. 6 shows a modification of the adjusting device 100 according to the present embodiment. In the adjusting device 100 of the present modified example, substantially the same operations as those of the adjusting device 100 according to the present embodiment shown in FIG. 5 are designated by the same reference numerals, and the description thereof will be omitted. The adjusting device 100 of the present modification corresponds to the temperature detecting unit 40 having a plurality of temperature sensors, and the first adjusting unit 110 and the second adjusting unit 130 adjust the output signals of different temperature sensors. FIG. 6 shows an example in which the temperature detection unit 40 has a first temperature sensor 42 and a second temperature sensor 44 that detect the temperature of the oscillator 30, respectively.

  In this case, the first adjustment unit 110 adjusts the output of the first temperature sensor 42. The first adjustment unit 110 adjusts at least one of the detection sensitivity and the offset of the first temperature sensor 42. It is desirable that the first adjusting unit 110 adjust at least the offset of the first temperature sensor 42. Further, it is more preferable that the first adjustment unit 110 adjusts the detection sensitivity and the offset of the first temperature sensor 42. In addition, the 1st temperature compensation part 120 outputs a 1st temperature compensation signal according to the signal which the 1st adjustment part 110 adjusted and outputs, as demonstrated in FIG.

  In addition, the second adjustment unit 130 adjusts the output of the second temperature sensor 44. The second adjustment unit 130 adjusts at least one of the detection sensitivity and the offset of the second temperature sensor 44. The second adjustment unit 130 preferably adjusts the detection sensitivity and the offset of the second temperature sensor 44. The second temperature compensating unit 140 outputs the second temperature compensating signal according to the signal adjusted and output by the second adjusting unit 130, as described in FIG.

  As described above, the adjusting device 100 of the present modified example generates and outputs the first temperature compensation signal and the second temperature compensation signal based on the outputs of the different temperature sensors. As a result, the adjustment apparatus 100 can independently generate the first temperature compensation signal and the second temperature compensation signal, and can increase the degree of freedom in design. Further, since the adjusting device 100 prevents the load of the temperature sensor from increasing, it is possible to prevent the S / N of the temperature detection signal from decreasing and compensate the temperature characteristic of the oscillator 30 with high accuracy. .

  Although the adjustment device 100 according to the present embodiment has described the example in which the first temperature compensation unit 120 has five generation circuits, the present invention is not limited to this, and may have one or a plurality of generation circuits. Similarly, in the adjusting device 100, the example in which the second temperature compensating unit 140 has seven compensating circuits has been described, but the present invention is not limited to this, and may have one or more compensating circuits. Further, although the adjusting device 100 according to the present embodiment described above receives the reference voltage from the external reference voltage generating unit 50, the reference voltage generating unit 50 may be provided inside instead of this. .

  Although the present invention has been described using the embodiments, the technical scope of the present invention is not limited to the scope described in the above embodiments. It is apparent to those skilled in the art that various modifications and improvements can be added to the above-described embodiment. It is apparent from the scope of the claims that the embodiments added with such modifications or improvements can be included in the technical scope of the present invention.

  The execution order of each process such as operation, procedure, step, and step in the device, system, program, and method shown in the claims, the specification, and the drawings is, in particular, “before” or “prior to”. It should be noted that the output of the previous process can be realized in any order unless the output of the previous process is used in the subsequent process. The operation flow in the claims, the specification, and the drawings is described using “first,” “next,” and the like for convenience, but it is essential that the operations are performed in this order. Not a thing.

10 oscillator, 20 oscillator circuit, 30 oscillator, 40 temperature detecting unit, 42 first temperature sensor, 44 second temperature sensor, 50 reference voltage generating unit, 100 adjusting device, 110 first adjusting unit, 120 first temperature compensating unit , 121 0th component generation circuit, 122 1st component generation circuit, 123 3rd component generation circuit, 124 4th component generation circuit, 125 5th component generation circuit, 130 2nd adjustment part, 140 2nd temperature compensation part, 141 First range compensation circuit, 142 second range compensation circuit, 143 third range compensation circuit, 144 fourth range compensation circuit, 145 fifth range compensation circuit, 146 sixth range compensation circuit, 147 seventh range compensation circuit, 150 addition Section, 1000 oscillators

Claims (14)

An adjusting device for adjusting a control voltage of an oscillator,
A first temperature sensor for detecting the temperature of the oscillator;
A second temperature sensor for detecting the temperature of the oscillator;
A first adjusting unit for adjusting at least one of a detection sensitivity and an offset of the output of the first temperature sensor ;
Depending on the output of the first adjusting portion, a first temperature compensation unit for outputting a reference temperature signal with the n-order temperature-voltage characteristics and the origin as a first temperature compensation signal,
A second adjustment unit that adjusts at least one of the detection sensitivity and the offset of the output of the second temperature sensor independently of the first adjustment unit;
Depending on the output of the second adjusting unit, a second temperature compensating unit for outputting a signal having the number of temperature-voltage characteristics higher than the order used in the first temperature compensating section as a second temperature compensation signal,
An adding unit that adds the first temperature compensation signal and the second temperature compensation signal and outputs the control voltage;
Adjusting device. An adjusting device for adjusting a control voltage of an oscillator,
  A first adjusting unit for adjusting an output offset of the temperature detecting unit;
  A first temperature compensating unit that outputs a signal having an nth-order temperature-voltage characteristic with a reference temperature as an origin, as a first temperature compensating signal, according to the output of the temperature detecting unit adjusted by the first adjusting unit;
  A second adjusting unit for adjusting the offset of the output of the temperature detecting unit independently of the first adjusting unit;
  A second temperature that outputs a signal having a temperature-voltage characteristic of an order higher than the order used by the first temperature compensating unit as a second temperature compensating signal according to the output of the temperature detecting unit adjusted by the second adjusting unit. Compensation section,
  An adding unit that adds the first temperature compensation signal and the second temperature compensation signal and outputs the control voltage;
  Adjusting device. The temperature detection unit has a first temperature sensor for detecting the temperature of the oscillator,
The adjustment device according to claim 2 , wherein the first adjustment unit and the second adjustment unit each adjust the output of the first temperature sensor. The temperature detector includes a first temperature sensor and a second temperature sensor that detect the temperature of the oscillator,
The first adjusting unit adjusts the output of the first temperature sensor,
The adjustment device according to claim 2 , wherein the second adjustment unit adjusts an output of the second temperature sensor. The said 1st adjustment part is an adjustment device as described in any one of Claim 1 to 4 which can adjust at least one part of the adjustment amount from the outside. The second adjustment unit, at least a portion of the adjustment amount adjustment device according to any one of the 5 adjustable Claim 1 from the outside. The first temperature compensating unit, in a temperature range from the first temperature to a second temperature, and outputs a first temperature compensation signal for temperature compensating the oscillator, to any one of claims 1 to 6 The described adjusting device. The first temperature compensating unit, the adjusting device according to claim 1 or 2 having a generation circuit for generating a signal having a third order temperature-voltage characteristics. The first temperature compensation unit includes a plurality of generation circuits that generate signals having temperature-voltage characteristics of different orders,
One generation circuit of the plurality of generator outputs a signal having a third order temperature voltage characteristic adjustment device according to claim 1 or 2. The second temperature compensating unit, at least part of the temperature range between the first temperature of the second temperature, and outputs a second temperature compensation signal for temperature compensating the oscillator, to claim 7 The described adjusting device. The second temperature compensation unit,
A plurality of compensating circuits for outputting a signal for compensating the temperature of the oscillator for each temperature range different from each other between the first temperature and the second temperature,
The adjusting device according to claim 10 , wherein signals output by the plurality of compensation circuits are output as the second temperature compensation signals. A method of adjusting the control voltage of an oscillator, comprising:
First adjusting at least one of the detection sensitivity and the offset of the output of the first temperature sensor ;
And outputting according to the output of the first adjusted the first temperature sensor, the reference temperature signal with the n-order temperature-voltage characteristics and the origin as a first temperature compensation signal,
Second adjusting at least one of the detection sensitivity and the offset of the output of the second temperature sensor independently of the first adjustment;
And outputting a signal having the second adjusted according to the output of the second temperature sensor, the temperature-voltage characteristic of the higher order than the order used in the first temperature compensation signal as a second temperature compensation signal,
Outputting the control voltage by adding the first temperature compensation signal and the second temperature compensation signal;
Adjustment method comprising. A method of adjusting the control voltage of an oscillator, comprising:
  First adjusting the offset of the output of the temperature detector,
  Outputting a signal having an nth-order temperature-voltage characteristic with a reference temperature as an origin, as a first temperature compensation signal, in accordance with the output of the first adjusted temperature detection unit;
  Secondly adjusting the offset of the output of the temperature detector independently of the first adjustment;
  Outputting a signal having a temperature-voltage characteristic of an order higher than the order used in the first temperature compensation signal as a second temperature compensation signal according to the output of the second adjusted temperature detection unit;
  Outputting the control voltage by adding the first temperature compensation signal and the second temperature compensation signal;
  Adjustment method comprising. An oscillator having a vibrator,
A temperature detector for detecting the temperature of the vibrator,
An adjusting device according to any one of claims 1 to 11 ,
An oscillation circuit that oscillates the oscillator at a frequency according to the control voltage output by the adjustment device,
An oscillating device.

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