JP2003143007A - Temperature-compensated high-frequency oscillator and communication apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an oscillator, using an SAW resonator, which improves the frequency stability and conducts temperature compensating in a practical temperature range. SOLUTION: The oscillator has a PLL which feeds a crystal-controlled oscillator circuit VCSO 4, using an SAW resonator with a control voltage corresponding to the phase difference, between the output signal of a temperature- compensated crystal oscillator circuit TCXO 1 and a signal provided by frequency-dividing an output signal of the VCSO 4, this controlling the output signal of the VCSO 4 to keep a constant frequency in a wide-temperature range. If the PLL is in pull out for some reason, a phase comparator 2 detects the pull out to change the signal to a control signal S8 of the VCSO 4, and will not result in great fluctuation of the output of the VCSO 4. With a recovery function being provided, the PLL can be turned into synchronized state.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a temperature-compensated high-frequency oscillator having high frequency stability by temperature-compensating a frequency temperature characteristic of a resonator such as a SAW resonator.

[0002]

2. Description of the Related Art An oscillator is mounted on a communication device such as a mobile phone, and communication data is modulated or demodulated based on an output signal of the oscillator. In recent communication equipment, due to the demand for higher communication speed,
It is desired to stably oscillate in a high frequency band (high frequency stability) and stably oscillate in a practical temperature range of communication equipment (temperature compensated). By the way, conventionally, there is a method of increasing the frequency stability of an oscillation circuit by using a PLL circuit using a stable reference oscillator such as TCXO. Here, as shown in an example of the oscillation circuit in FIG.
Signal synchronized with the output signal S1 of the voltage-controlled oscillation circuit 9
The phase comparison unit 92 supplies a control voltage to the voltage controlled oscillator circuit 93 so that the voltage is outputted from the signal generator 3.

[0003]

However, such a P
The oscillator using the LL circuit may be out of lock for some reason. If the lock is released, this oscillator will not operate normally and the oscillation frequency will change significantly. For this reason, if it is installed in a communication device as it is, a malfunction such as a communication error will occur.

The present invention has been made in consideration of the above points, and has a high frequency stability in a wide temperature range and a temperature compensation type high frequency oscillator having a recovery function, and a communication device using the temperature compensation type high frequency oscillator. The purpose is to provide.

[0005]

In order to solve the above-mentioned problems, a temperature-compensated high-frequency oscillator according to the present invention includes a voltage-controlled oscillation circuit in which the frequency of an output signal changes according to a control voltage supplied. A frequency dividing circuit for dividing the output signal of the voltage control type oscillation circuit, a temperature compensation type oscillation circuit for outputting a signal of a constant frequency independent of the ambient temperature, an output signal of the frequency division circuit, and the temperature compensation A phase comparator that compares the phases of the output signals of the oscillator circuits, generates a first control voltage corresponding to the phase difference, and outputs a phase difference signal that switches the voltage level when the phase difference is a predetermined amount or more; A voltage generation circuit for generating a second control voltage for bringing the frequency of the output signal of the voltage controlled oscillator circuit close to the target frequency; and the first control voltage according to the voltage level of the phase difference signal, The above One of 2 control voltage, characterized in that it comprises, selectively supplying selection circuit as the control voltage to the voltage controlled oscillator circuit.

According to this structure, the voltage control type oscillation circuit outputs a signal having a frequency corresponding to the supplied control voltage, and the temperature compensation type oscillation circuit outputs a signal having a constant frequency which does not depend on the ambient temperature. . Then, the phase comparison unit outputs a phase difference signal according to the phase difference of the signals output from these circuits, and the low band pass filter smooths the phase difference signal,
It is output to the voltage control type oscillation circuit as a control signal. As described above, by using the PLL circuit configuration as the temperature compensation type high frequency oscillator, the frequency of the signal output from the voltage control type oscillation circuit can be maintained constant even if the ambient temperature changes. Further, even if the PLL is unlocked for some reason, the voltage-controlled oscillation circuit is controlled by the second control voltage, so that the temperature-compensated high-frequency oscillator of the present invention does not greatly change the output clock signal. .

The temperature-compensated high frequency oscillator according to the present invention is
A voltage control type oscillation circuit in which the frequency of the output signal changes according to the supplied control voltage, a frequency division circuit for dividing the output signal of the voltage control type oscillation circuit, and a signal of a constant frequency that does not depend on the ambient temperature A phase comparator that compares the phases of the output signals of the temperature-compensated oscillator circuit and the frequency divider circuit that are output with the output signal of the temperature-compensated oscillator circuit, and generates a first control voltage corresponding to the phase difference; A lock detection circuit that outputs a lock signal whose voltage level is switched when the value of the first control voltage is within a predetermined range; and a first lock circuit for making the frequency of the output signal of the voltage-controlled oscillator circuit close to the target frequency. Two
A voltage generation circuit that generates a control voltage, and selectively supplies either the first control voltage or the second control voltage to the voltage-controlled oscillation circuit as the control voltage according to the voltage level of the lock signal. A selection circuit may be provided.

Here, the above-mentioned voltage generation circuit may be characterized in that it is a constant voltage generation circuit, and a temperature for suppressing a frequency temperature change of an output signal of the voltage controlled oscillation circuit according to an ambient temperature. The circuit may output a compensation voltage as the second control voltage.

Further, the above voltage controlled oscillator circuit is
It is preferably a voltage-controlled oscillation circuit that oscillates an AW resonator. Further, the temperature compensation type oscillation circuit described above is preferably a temperature compensation type crystal oscillation circuit using a crystal AT oscillator. Furthermore, the temperature-compensated high-frequency oscillator having the above-described configurations may be provided in communication equipment.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, preferred embodiments of the present invention will be described with reference to the drawings.

A: First Embodiment (1) Overall Configuration FIG. 1 is a block diagram showing the configuration of a temperature compensation type high frequency oscillator 100 which is an embodiment of the present invention. The temperature-compensated high-frequency oscillator 100 includes a temperature-compensated oscillator circuit (TCX).
O) 1, a phase comparison unit 2, a low band pass filter 3,
A voltage controlled oscillator (VCSO) 4, a frequency divider 5,
A selection circuit 7 and a control voltage generation circuit 8 are provided.

The temperature compensation type oscillation circuit (TCXO) 1 comprises a temperature compensation circuit 1-a and a voltage control type oscillation circuit 1-b. The voltage control type oscillation circuit 1-b includes a crystal oscillator and outputs a clock signal S1 having a frequency corresponding to the voltage level of the signal Stmp output from the temperature compensation circuit 1-a. The temperature compensation circuit 1-a includes a temperature compensation type high frequency oscillator 1
A voltage-level signal Stmp for temperature-compensating the frequency-temperature characteristic of the piezoelectric vibrator of the voltage-controlled oscillator circuit 1-b is output according to the ambient temperature of 00. Therefore TCXO1
Outputs a clock signal S1 having a constant frequency in a frequency range of several kHz to several tens of MHz in a wide temperature range including the practical temperature range of the oscillator 100.

The frequency dividing circuit 5 frequency-divides the clock signal S4 output from the VCSO4 and outputs a frequency-divided signal S5.
Here, the frequency division ratio 1 / M of the frequency dividing circuit 5 is such that at the reference temperature (for example, 25 degrees), the frequency of the frequency dividing signal S5 is TC.
The frequency division ratio is set to be equal to the frequency of the clock signal S1 output from XO1.

The phase comparator 2 compares the phases of the clock signal S1 output from the TCXO1 and the frequency-divided signal S5 output from the frequency dividing circuit 5, and the phase difference signal S corresponding to the phase difference.
2 is output. The low band pass filter 3 includes the phase comparison unit 2
The signal S3 obtained by smoothing the phase difference signal S2 output from is output to the selection circuit 7. Specifically, the signal S3 corresponding to the average signal level of the phase difference signal S2 is output to the selection circuit 7.

The operation contents of the phase comparator 2 and the low-pass low-pass filter 3 will be described in more detail below. The phase comparison unit 2 firstly outputs the pulse signal S having a pulse width corresponding to the period from the rising (or falling) of the clock signal S1 to the rising (or falling) of the divided signal S5.
P is generated and output as a signal S2 indicating the phase difference. Then, the low band pass filter 3 smoothes the pulse signal SP and outputs the signal S having the average voltage level of the pulse signal SP.
3 is output.

Here, when the frequencies of the signals S1 and S5 are equal and the high level periods TA-1, TA-2, TA-3, ... Of the pulse signal SP all have the same time width as shown in FIG. , The low-bandpass filter 3 includes signals S1 and S
The voltage level indicating that the phases of 5 are the same (reference voltage level V
ref) signal S3 will be output.

On the other hand, as shown in FIG. 3, the divided signal S5
If the frequency of changes to a certain time TX, the pulse signal S
The high level periods TA-4 and TA-5 of P have the same value, but the measurement time TA-6 has a different value. In this case, the low band pass filter 3 receives the signals S1 and S5 after the time TX.
A signal S3 (a level different from the reference voltage level Vref) having a voltage level corresponding to the phase difference is output. By configuring the phase comparison unit 2 and the low band pass filter 3 in this way, the low pass low band pass filter 3 centers the reference potential level Vref in accordance with the phase difference between the clock signal S1 and the divided signal S5. As a result, a signal S3 whose voltage level changes is output.

In addition to the function described above, the phase comparison unit 2 also outputs a phase difference signal S2A whose voltage level changes according to the phase difference between the clock signal S1 and the divided signal S5.
The phase difference signal S2A is output at the L level when the phase difference between the clock signal S1 and the frequency-divided signal S5 is in the detectable range, and the phase difference signal S2A is within the range in which the phase difference between the clock signal S1 and the frequency-divided signal S5 can be detected. If it exceeds, it is output at H level. This predetermined amount PA is a value obtained by performing experiments in advance, and is the output signal S of the low band pass filter 3.
3 is supplied to VCSO4 as control signal S7,
This corresponds to a threshold that can control the oscillation frequency of O4 to a target frequency.

The voltage controlled oscillator circuit (VCSO) 4 has an S
The voltage-controlled oscillator circuit oscillates the AW resonator 4-a and outputs a clock signal S4 whose frequency changes in the range of, for example, several hundred Hz to several GHz in proportion to the voltage level of the control signal S7. The SAW resonator is a resonator that utilizes the property that energy is concentrated and propagates near the surface of an elastic body, and specifically, an electrode on a blind is arranged on a piezoelectric substrate and excited by the electrode. A surface wave is reflected to generate a standing wave, which functions as a resonator.

The selection circuit 7 selects either the output signal S3 of the low band pass filter 3 or the output signal S8 of the control voltage generation circuit 8 according to the signal level of the phase difference signal S2A output from the phase comparison section 2. VC as the control signal S7
Supply to SO4. Specifically, while the signal level of the phase difference signal S2A is L level, the signal S3 is supplied to the VCSO4 as the control signal S7. On the other hand, the phase difference signal S
While the signal level of 2A is H level, the signal S3 is supplied to the VCSO4 as the control signal S7.

The control voltage generating circuit 8 generates and outputs a signal S8 having a constant voltage level for making the frequency of the output signal S4 of the VCSO4 close to a target frequency (target frequency). Although various modes of the control voltage generation circuit 8 are possible, it is assumed in the following description that the control voltage generation circuit 8 is a constant voltage circuit that generates a predetermined constant voltage. FIG. 4 is an example of the configuration of a constant voltage circuit, in which a power supply voltage VCC that is generally included in an electronic device such as a communication device including the temperature-compensated high frequency oscillator 100 is divided by a voltage dividing circuit 21 to generate a predetermined constant voltage. It is a thing. The voltage level of the constant voltage is set to a predetermined level so that the frequency of the output signal S4 of the VCSO4 will be near the target frequency when supplied to the VCSO4.

(2) Operation In this temperature compensation type high frequency oscillator 100, first, T
The phase of the clock signal S1 of the CXO1 and the frequency-divided signal S5 of the frequency dividing circuit 5 obtained by frequency-dividing the frequency output S4 of the VCSO4 by M are compared by the phase comparison unit 2. A signal S2 corresponding to the result of the phase comparison is output from the phase comparison unit 2. The output signal S2 is smoothed by the low pass filter 3 and then output.
The signal S3 is output to the selection circuit 7. The voltage level of signal S3 corresponds to the average voltage level of signal S2.

When the two signals S1 and S5 have the same frequency and the same phase, the signal S3 having the reference voltage level Vref is output to the selection circuit 7. Further, since the clock signal S1 and the divided signal S5 have the same phase, the phase difference signal S2A output from the phase comparison unit 2
Is maintained at the L level. Therefore, the selection circuit 7
The signal S3 is output to the VCSO4 as the control signal S7.
The VCSO4 outputs a clock signal S4 having a frequency corresponding to the voltage level of the control signal S7 (here, the reference voltage level Vref). Thus, the two signals S1, S
If the phases of 5 are the same, the phase of the temperature-compensated clock signal S1 and the frequency-divided signal S5 obtained by dividing the frequency of the clock signal S4 are maintained (locked) so that the VCSO4 Means that the clock signal S4 having a constant frequency obtained by multiplying the frequency of the clock signal S1 by M is continuously output.

Here, the ambient temperature changes and the SAW resonator 4
When the frequency of the clock signal S4 of the VCSO4 changes due to the frequency-temperature characteristic of −a, the frequency of the divided signal S5 changes, so that the two signals S1 and S5 have different phases. In this case, the phase comparison unit 2 outputs the phase difference signal S2 according to the phase difference between the signals S1 and S5. The phase difference signal S2 is smoothed by the low pass filter 3, and then the signal S of a predetermined voltage level (a level different from the reference value Vref).
3 is output to the selection circuit 7. When the phase difference between the clock signal S1 and the divided signal S5 is equal to or less than the predetermined amount PA, the phase difference signal S2A output from the phase comparison unit 2 is maintained at L level. Therefore, the selection circuit 7 outputs the signal S3 to the VCSO4 as the control signal S7. V
The CSO4 outputs the clock signal S4 having a frequency corresponding to the voltage level of the control signal S3 so that the phase difference between the clock signal S1 and the divided signal S5 is eliminated.
The frequency of the clock signal S4 will be controlled. In this way, even if the ambient temperature changes and the two signals S1 and S5 have different phases, the signal S5 immediately operates so as to have the same phase as the signal S1. As a result, from the VCSO4, the clock signal S4 having a constant frequency obtained by multiplying the frequency of the clock signal S1 by M is generated.
Can be continuously output.

On the other hand, when the phase difference between the clock signal S1 and the divided signal S5 exceeds the predetermined amount PA, the phase comparison unit 2
The phase difference signal S2A output from the signal changes to H level. Therefore, the selection circuit 7 supplies the output signal S8 of the control voltage generation circuit 8 to the VCSO4 as the control signal S7. As a result, the VCSO 4 outputs the clock signal S4 having a frequency near the target frequency. here,
The phase difference between the divided signal S5 and the clock signal S1 is a predetermined amount PA
The above case means a state in which the output frequency of the VCSO4 cannot be controlled so as to absorb the phase difference between the divided signal S5 and the clock signal S1. In the present embodiment, the output of the control voltage generation circuit 8 By the signal S8, the frequency of the output signal S4 is forcibly controlled to be near the target frequency. By performing such control, it is possible to prevent the output signal S4 of the VCSO4 from being largely deviated from the target frequency. After that, when the phase difference between the frequency-divided signal S5 and the clock signal S1 becomes small and becomes equal to or smaller than the predetermined amount PA, the phase difference signal S2A switches to the L level. As a result, the selection circuit 7 changes the signal S3 to VCSO.
4 will be supplied again, and the output frequency of the VCSO 4 can be controlled to the target frequency.

As described above, the temperature-compensated high-frequency oscillator 100 according to this embodiment has the TCXO 1, the phase comparison unit 2,
Even if the ambient temperature changes, the clock signal S output from the VCSO4 to the outside can be obtained by forming the PLL circuit configuration by the low band pass filter 3, the VCSO4, and the frequency dividing circuit 5.
The frequency of 4 can be kept constant. At the same time, the frequency stability of the clock signal S4 can be increased. Furthermore, the temperature-compensated high-frequency oscillator 100 is used when the phase difference between the frequency-divided signal S5 and the clock signal S1 exceeds the predetermined amount PA and the PLL circuit does not operate normally (when the PLL circuit is unlocked). Also VC
The frequency of the clock signal S4 output from SO4 to the outside can be continuously controlled to the target frequency without being significantly changed. In addition, the PLL circuit can be recovered to a normal operating state (locked state).

In the above description, the control voltage generation circuit 8 has been described as a circuit for generating and outputting the signal S8 having a constant voltage level, but the mode of the control voltage generation circuit 8 may be as follows. .

FIG. 5 shows a control voltage generation circuit 8 according to this embodiment.
2 is an example of the circuit configuration of FIG. The temperature detection circuit 31 has a function of detecting ambient temperature. The voltage signal output circuit 32 outputs a signal S8 having a voltage level corresponding to the value of the ambient temperature. The control voltage generation circuit 8 according to this aspect generates a voltage for temperature-compensating the frequency-temperature characteristic of the SAW resonator of VCSO4 and outputs it as a signal S8. Therefore, the PLL circuit 1
Even if 0 is unlocked, VCSO4 SA
The frequency-temperature characteristic of the W resonator can be temperature-compensated.

As described above, according to the temperature-compensated high frequency oscillator 100 according to the present embodiment, it is possible to satisfy both the high frequency and the high frequency stability required for performing large-capacity data communication. it can.

B: Second Embodiment FIG. 6 shows a temperature-compensated high frequency oscillator 2 according to the second embodiment.
FIG. The difference from the configuration of the temperature-compensated high frequency oscillator 100 according to the first embodiment is that instead of the low pass filter 3, a DSP (Digital Signal Processo) is used.
r) having 301. DSP is the phase difference signal S2
The signal S3 corresponding to is generated by calculation and output to the selection circuit 7.

In the first embodiment, the low-pass filter 3 is usually composed of an analog filter, but since it is difficult to make an analog filter into an IC, it is difficult to downsize the circuit board. In addition, the analog filter has a high impedance and is susceptible to external noise. Particularly, in a communication device in which the present invention is used, it is a serious problem that it is susceptible to external noise because various high-frequency noises are present in the surroundings. further,
Since similar PLLs often exist around communication devices, there is a problem that they are easily affected by mutual interference between the PLLs. In the present embodiment, by adopting the DSP 301 instead of the low pass filter 3, the low pass filter 3 in the first embodiment described above becomes unnecessary. For this reason, it is possible to reduce the size of the device by making it into an IC, and further improve the noise resistance such that it is less susceptible to external noise.

Further, as shown in FIG. 7A, the phase comparison section 2 in the first embodiment is composed of a phase comparison circuit 201 and a charge pump 202. Therefore, in the second embodiment, the charge pump 202 and the low band pass filter 3 shown in FIG. 7A are replaced with a DSP (see FIG. 7B), and the phase comparison circuits 201 and D are provided.
It may be configured by SP301.

C: Modified Example The embodiment of the present invention has been described above. However, this embodiment is merely an example and can be modified within the scope of the present invention. For example, the following may be considered as modifications.

(1) First Modification As shown in FIG. 8, whether or not the PLL circuit is operating normally (whether or not the PLL circuit is in the locked state) is judged from the phase difference signal S2 output from the phase comparator 2. ) May be provided with the lock detection circuit 9. Then, the operation of the selection circuit 7 may be controlled using the signal S2B corresponding to the detection result output from the lock detection circuit 9. That is, in the above-described first embodiment, the phase comparison unit 2 detects whether the phase difference between the divided signal S5 and the clock signal S1 is less than or equal to a predetermined amount PA, and the operation of the selection circuit 7 is performed using the detection result. Although the control is performed, in the present modification, the operation control of the selection circuit 7 is performed using the detection result signal S2B from the lock detection circuit 9.

(2) Second Modification In each of the above-described embodiments, the temperature compensation type high frequency oscillators 100 and 200 are described as independent oscillators.
The present invention may be applied to a communication device having a. FIG. 9 is a schematic configuration diagram of an optical interface module 500 using an oscillator according to the present invention. The optical interface module 500 performs signal conversion between an optical signal and an electric signal in order to exchange data via an optical network. For example, signal conversion between an optical signal of 10.3125 Gbit and an electric signal of 3.125 Gbit (4 systems) is performed. The electric / optical conversion circuit 516 converts the electric signal output from the S / P conversion circuit into an optical signal and outputs the optical signal to the optical network side. The optical / electrical conversion circuit 517 converts an optical signal output from the optical network side into an electric signal and converts it into an S signal.
Output to the / P conversion circuit 515.

The oscillators 531 and 532 are the temperature-compensated high-frequency oscillator 100 (or the temperature-compensated high-frequency oscillator 200) according to the present invention and output a clock signal having a constant frequency regardless of the ambient temperature. Then, using this clock signal as a reference signal, the S / P conversion circuit 511 of 3.215 Gbit and the P / S conversion circuit 512, and the P / S of 10.3125 Gbit connected via the bit code conversion circuit 13
It is used for each circuit of the S conversion circuit 514 and the S / P conversion circuit 515. Thus, the temperature-compensated high-frequency oscillator 100 (or the temperature-compensated high-frequency oscillator 20 according to the present invention
By using 0), it is possible to provide the optical interface module 500 which is capable of stably transmitting and receiving data via the optical network without being influenced by the ambient temperature.

[0037]

As described above, according to the present invention,
In the oscillator using the SAW resonator, the temperature compensation can be performed in the practical temperature range by using the PLL circuit configuration in order to improve the frequency stability. Further, by providing the recovery function, even if the lock of the PLL circuit is released, the frequency of the output signal can be returned to the locked state again without being largely changed.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a temperature-compensated high frequency oscillator 100 according to a first embodiment of the present invention.

FIG. 2 is a diagram for explaining an operation content of a phase comparison unit 2 of the same temperature-compensated high frequency oscillator 100.

FIG. 3 is a diagram for explaining the operation content of the phase comparison unit 2 of the same temperature-compensated high frequency oscillator 100.

4 is a configuration diagram of a control voltage generation circuit 8 of the temperature-compensated high frequency oscillator 100. FIG.

5 is a configuration diagram of a control voltage generation circuit 8 of the temperature-compensated high frequency oscillator 100. FIG.

FIG. 6 is a configuration diagram of a temperature compensation type high frequency oscillator 200 according to a second embodiment of the present invention.

FIG. 7 is a DSP3 of the same temperature-compensated high frequency oscillator 200.
It is a block diagram around 01.

FIG. 8 is a diagram for explaining a modified example of the present invention.

FIG. 9 is a diagram for explaining a modified example of the present invention.

FIG. 10 is a diagram for explaining a conventional technique.

[Explanation of symbols]

1 ... Temperature compensation oscillator (TCXO) 1-a ... Temperature compensation circuit, 1-b ... Voltage controlled oscillator 2 ... Phase comparator, 3 ... Low-pass filter, 4 ... Voltage control type oscillation circuit (VCSO), 4-a ... SAW (Surface Acoustic Wave) resonator, 5: Dividing circuit, 7 ... Selection circuit, 8 ... Control voltage generation circuit, 100, 200 ... Temperature compensated high frequency oscillator.

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Claims (7)

[Claims] 1. A voltage-controlled oscillation circuit in which the frequency of an output signal changes according to a control voltage supplied, a frequency-dividing circuit that divides the output signal of the voltage-controlled oscillation circuit, and does not depend on ambient temperature. A phase of a temperature compensation type oscillation circuit that outputs a signal of a constant frequency, an output signal of the frequency dividing circuit, and an output signal of the temperature compensation type oscillation circuit are compared, and a first control voltage corresponding to the phase difference is generated. At the same time, a phase comparison unit that outputs a phase difference signal that switches the voltage level when the phase difference is equal to or more than a predetermined amount, and a second for making the frequency of the output signal of the voltage controlled oscillation circuit close to the target frequency A voltage generation circuit that generates a control voltage, and selectively supplies either the first control voltage or the second control voltage to the voltage-controlled oscillation circuit as the control voltage according to the voltage level of the phase difference signal. You Temperature-compensated radio-frequency oscillator, characterized in that it comprises a selection circuit. 2. A voltage control type oscillation circuit in which the frequency of an output signal changes according to a control voltage supplied, a frequency dividing circuit for dividing an output signal of the voltage control type oscillation circuit, and an ambient temperature independent A phase for comparing the phases of the output signals of the temperature-compensated oscillator circuit and the frequency divider circuit, which output a signal of a constant frequency, with the output signal of the temperature-compensated oscillator circuit, and for generating a first control voltage corresponding to the phase difference. A comparison unit; a lock detection circuit that outputs a lock signal whose voltage level switches when the value of the first control voltage is within a predetermined range; and a frequency near the target frequency of the output signal of the voltage-controlled oscillator circuit. And a voltage generation circuit for generating a second control voltage for controlling the voltage control type oscillation circuit according to the voltage level of the lock signal. Temperature-compensated radio-frequency oscillator, characterized in that it comprises, selectively supplying selection circuit by. 3. The temperature compensated high frequency oscillator according to claim 1, wherein the voltage generation circuit is a constant voltage generation circuit. 4. The voltage generation circuit is a circuit which outputs a temperature compensation voltage for suppressing a frequency temperature change of an output signal of the voltage controlled oscillator circuit as the second control voltage according to an ambient temperature. The temperature-compensated high frequency oscillator according to claim 1 or 2. 5. The temperature-compensated high-frequency oscillator according to claim 1, wherein the voltage-controlled oscillator circuit is a voltage-controlled oscillator circuit that oscillates a SAW resonator. 6. The temperature-compensated crystal oscillation circuit according to claim 1, wherein the temperature-compensated crystal oscillation circuit is a temperature-compensated crystal oscillation circuit using a crystal AT oscillator. High frequency oscillator. 7. A communication device comprising the temperature-compensated high-frequency oscillator according to claim 1. Description: