JP2883566B2 - Oscillator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oscillator having, for example, a temperature compensation function for output power and a frequency switching function.

[0002]

2. Description of the Related Art A conventional oscillating device having a frequency switching function and a temperature compensation function for output power will be described with reference to FIG. Reference numerals 61 and 62 denote oscillators that generate high-frequency signals having different frequencies. Oscillator 61,
An oscillator driving driver 63 for driving the oscillators 61 and 62 is connected to a power input terminal 62, and anodes of PIN diodes 64 and 65 are connected to a high frequency output terminal, respectively. ing. In addition, PIN diode 64,
The 65 cathodes are connected to each other.

A high resistance 66 is connected between the cathodes of the PIN diodes 64 and 65 and the ground to form a DC return circuit. A high frequency short-circuit capacitor 67 is connected to the cathodes of the PIN diodes 64 and 65.
The high-frequency short-circuit capacitor 67 is connected to the output terminal OU of the oscillator.
Connected to T. Note that PIN diodes 64 and 6
The anode 5 is connected to a PIN diode drive driver 70 via high resistances 68 and 69.

[0004] In the oscillation apparatus having the above configuration, the drive voltage shown in FIG. 2 (a) to the power input terminal of the oscillator 61 by the oscillator driver for driving -63 is also the power input terminal of the oscillator 62 Is supplied with a drive voltage as shown in FIG.
At this time, a voltage between terminals of the PIN diode 64 is set to a voltage as shown in FIG. 2C and a terminal between the terminals of the PIN diode 65 is set as shown in FIG.
The voltage is set as shown in FIG. The horizontal axis in FIG. 2 indicates time t.

Here, the operation of the oscillation device having the above configuration will be described. For example, when extracting a high-frequency component from the oscillating unit 61, the oscillating unit driving driver 63 is used as shown in FIG.
Driving voltage, such as a1 in (a) is supplied to the oscillating unit 61. At this time, to reduce noise and spurs,
As shown in FIG. 2B, no drive voltage is supplied to the oscillator 62 .

[0006] Incidentally, at the same time, PIN diodes - PIN diode from de driver for driving -70 - a positive voltage is supplied to the de 64, PIN diode - the de 6 5 does not supply a positive voltage.

When a positive voltage is supplied to the PIN diode 64, a positive voltage VF such as c1 in FIG. 2C is applied between the terminals of the PIN diode 64 through the high resistance 68 and the high resistance 66. Is added, and the PIN diode 64 is in the short-circuit mode. At this time, the impedance viewed from the point A in FIG.
~ 80Ω).

[0008] By the way, PIN diode - The de 6 5, P
No voltage is supplied from the IN diode drive driver 70. Therefore, the anode of the PIN diode 65 becomes 0V. However, the cathode of the PIN diode 64 has a positive voltage applied between the cathode and the ground due to the presence of the high resistance 66.
5 is in a reverse bias state. Therefore, the voltage between the terminals of the PIN diode 65 is equivalent to a negative voltage as shown by d1 in FIG. As a result,
The impedance when the oscillation section 62 is viewed from the point B in FIG. 6 is open, and only the high-frequency component of the oscillation section 61 is output to the output terminal O.
Output to UT.

The power supply voltage of the oscillator driver 63 is set so as to increase as the temperature rises in order to compensate the output power of the oscillator. Also, in order to reduce the noise and spurious of the oscillation device,
ON / OFF of the power supply voltage of the oscillator driving driver-63;
ON / OFF of the output voltage of the PIN diode drive driver 70 is synchronized.

[0010]

In the above-mentioned conventional oscillating device, an oscillating section driving driver 63 for supplying a driving voltage to the oscillating section 61 and the oscillating section 62, and a PIN diode are provided.
A driver 70 for driving a PIN diode for supplying a driving voltage to the gates 64 and 65 is separately provided, and requires two driving driver circuits.

In order to synchronize the on / off of the driving voltage output from the oscillation section driving driver-63 with the on / off of the driving voltage output from the PIN diode driving driver-70, a synchronization is performed. Control circuit is required.

Therefore, it has been difficult to reduce the size and cost of the conventional oscillation device. In addition, since the temperature compensation of the output power of the oscillation device is performed by changing the drive voltage for the oscillation unit, there is a disadvantage that the frequency stability is poor.

An object of the present invention is to solve the above-mentioned drawbacks and to provide an oscillation device which can be reduced in size and cost and has good frequency stability.

[0014]

According to the present invention, there are provided a plurality of oscillating units for generating high-frequency signals having different frequencies, and an anode connected to a high-frequency output terminal of each of the plurality of oscillating units. Multiple PIs connected to each other
An N diode switch, a DC return circuit connected between the cathode of the PIN diode and ground, an output terminal connected to the cathode of the PIN diode ,
A drive voltage that increases with temperature rise is applied to the plurality of oscillators.
In an oscillating device including a driver for driving an oscillating unit, a resistance element is connected between a power input terminal of each of the oscillating units and the high-frequency output terminal.

Further, the DC return circuit is constituted by a resistance element.

Further, the DC return circuit includes a resistance element,
It comprises a high-frequency short-circuit capacitor connected in parallel to this resistance element, and a quarter-wavelength line formed in series on the dielectric element and formed on a dielectric substrate.

Further, the DC return circuit includes a resistance element,
It comprises a high-frequency short-circuit capacitor connected in parallel to the resistance element and a high-frequency coil connected in series to the resistance element.

Further, the DC return circuit includes a resistance element,
A 1/4 wavelength open line connected in parallel to the resistance element and formed on a dielectric substrate, and a 1/4 wavelength line connected in series to the resistance element and formed on the dielectric substrate. doing.

In the above-described configuration, the power supply voltage is supplied from the oscillating section driver to the oscillating section from which the high frequency component is to be extracted. At this time, a positive voltage is applied between the terminals of the PIN diode through the high resistance connected between the power supply input terminal and the high-frequency output terminal of the oscillating unit and the high resistance between the ground and the ground. Becomes the short-circuit mode. As a result, the impedance when looking at the oscillating section from which the high-frequency component is to be extracted becomes substantially a desired value, and a high-frequency signal having a predetermined frequency can be extracted to the output terminal.

In this case, since the power supply voltage is not supplied to the other oscillating units from the oscillating unit driving driver, the power supply voltage becomes 0 V and the anode of the PIN diode is also 0 V.
Becomes However, since a positive voltage is applied to the cathode of the PIN diode connected to the oscillation unit from which the high-frequency component is to be extracted, the PIN diodes connected to the other oscillation units are in a reverse bias state. . For this reason, the voltage between the terminals of the PIN diode is equivalently applied with a negative voltage and the open mode.
And no high-frequency signal is output from the other oscillators.
As a result, only the high frequency component of the oscillating unit from which the high frequency component is to be extracted is output to the output terminal of the oscillator.

As described above, according to the present invention, the oscillating section and the PIN diode can be driven only by the oscillating section driving driver, and no pin diode driving driver or the like is required. Therefore, it is possible to realize an oscillation device with a frequency switching function that can reduce the size and cost of the circuit. The power supply voltage of the driver for driving the oscillating unit rises as the temperature rises to compensate for the temperature of the output power of the oscillating device. However, when the power supply voltage rises, the forward current of the PIN diode increases, thereby reducing the series resistance of the PIN diode and reducing the high frequency loss of the PIN diode. As a result, the change in the power supply voltage required for the temperature compensation of the output power can be small, and the deterioration of the frequency stability can be suppressed.

[0022]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIG. Reference numerals 11 and 12 are oscillators that generate different frequencies. An oscillator driving driver 13 for supplying a drive voltage to the oscillators 11 and 12 is connected to a power input terminal of the oscillators 11 and 12. Further, high resistances 14 and 15 are connected between the power input terminals and the high frequency output terminals of the oscillation units 11 and 12, respectively.

The anode of a PIN diode 16 is connected to the high-frequency output terminal of the oscillating unit 11, the PIN diode 17 is connected to the high-frequency output terminal of the oscillating unit 12,
The cathodes of the IN diodes 16 and 17 are connected to each other. A high resistance 1 constituting a DC return circuit is provided between the cathodes of the PIN diodes 16 and 17 and the ground.
8 are connected. In addition, PIN diodes 16, 1
The cathode 7 is connected to the high-frequency short-circuit capacitor 19, and the high-frequency short-circuit capacitor 19 is connected to the output terminal OUT of the oscillation device.

In the above configuration, a drive voltage as shown in FIG. 2A is supplied to the power input terminal of the oscillating unit 11, and a power input terminal of the oscillator 12 is supplied as shown in FIG. A drive voltage is supplied, and, for example, the oscillation units 11 and 12 are controlled to operate alternately. At this time, the voltages between the terminals of the PIN diodes 16 and 17 are respectively shown in FIG.
(D).

Here, the operation of the oscillating device having the above configuration will be described. For example, when extracting the high-frequency component of the oscillating unit 11, the driver 13 for driving the oscillating unit shown in FIG.
A drive voltage as indicated by a1 in (a) is supplied to the oscillating unit 11, and the oscillating unit 11 generates a high-frequency signal. At this time, in order to reduce noise and spurious, FIG.
As shown by b1, no drive voltage is supplied to the oscillation unit 12.

When the driving voltage a1 is supplied to the oscillating unit 11, the high resistance 14 between the power supply input terminal and the high frequency output terminal of the oscillating unit 11 and the high resistance 18 between the terminals of the PIN diode 16 , A positive voltage VF as shown by c1 in FIG. As a result, the PIN
The mode 16 is in the short-circuit mode, and the oscillation section 11 is shifted from the point A in FIG.
The impedance looking at the side is almost the desired impedance (usually about 30 to 80Ω).

On the other hand, the oscillator 12 is not supplied with a drive voltage from the oscillator driver 13 as indicated by b1 in FIG. 2B. For this reason, the driving voltage becomes 0 V, and PI
No drive voltage is supplied to the N diode 17 and
The anode of the IN diode 17 is also at 0V. However, since a positive voltage is applied to the cathode of the PIN diode 16 connected to the oscillation section 11 from which the high frequency component is to be extracted, the PIN diode 17 is in a reverse bias state. As a result, the terminal voltage of the PIN diode 17 is equivalently negatively applied as shown by d1 in FIG. As a result, the impedance when the oscillating unit 12 is viewed from the point B in FIG.
Is output to

The above description relates to a case where a high-frequency component is extracted from the oscillating unit 11. When extracting a high-frequency component from the oscillating unit 12, a driving voltage such as b2 in FIG. At this time, a high resistance 15 or a high resistance 18 is applied between the terminals of the PIN diode 17 to obtain d2 in FIG.
A positive voltage VF as shown in FIG. 4 is applied, and a high-frequency component on the oscillation unit 12 side is output to the output terminal OUT. In this case, no drive voltage is supplied to the oscillation unit 11 as indicated by a2 in FIG. 2A, and no high-frequency component is output. Also, the voltage between the terminals of the PIN diode 16 is equivalently a negative voltage as shown by c2 in FIG. 2C, and is in the open mode.

According to the above-described configuration, the oscillators 11 and 12 and the PIN diodes 16 and 17 can be driven by the oscillator driver 13. Therefore, PIN
There is no need for a PIN diode driving driver for driving the diode. For this reason, the circuit configuration can be downsized and the price can be reduced.

The drive voltage of the oscillator driver 13 increases as the temperature rises in order to compensate for the output power of the oscillator. At this time, the forward current of the PIN diodes 16 and 17 increases due to an increase in the drive voltage of the oscillation section driver 13 and the PIN diode 1 is increased.
The series resistance of 6, 17 is reduced. This allows PI
Since the high frequency loss of N diodes 16 and 17 is reduced,
The change in the drive voltage of the oscillation section driver 13 required for the temperature compensation of the output power can be small. For this reason, the deterioration of the frequency stability of the oscillation device can be suppressed.

Next, another embodiment of the present invention will be described with reference to FIG.
Will be described. In the embodiment of FIG. 3, the same reference numerals are given to portions corresponding to FIG. 1, and duplicate description will be omitted. In the case shown in FIG. 1, the high resistance 18 connected between the cathodes of the PIN diodes 16 and 17 and the ground connects to the D terminal.
A C return circuit is formed. In FIG. 3, a DC return circuit between the cathodes of the PIN diodes 16 and 17 and the ground is connected to a high resistance 18, a high-frequency short-circuit capacitor 31 connected in parallel with the high resistance 18, and a high resistance 18. The high frequency coil 32 is connected in series. In the case of this configuration, the loss at a high frequency can be reduced as compared with the configuration of FIG. The operation of the PIN diodes 16 and 17 is the same as that of the embodiment shown in FIG.

Next, another embodiment of the present invention will be described with reference to FIG. Also in the embodiment of FIG. 4, parts corresponding to those in FIG. 1 are denoted by the same reference numerals, and redundant description will be omitted. In the case of the embodiment of FIG. 4, a DC resistor between the cathode of the PIN diodes 16 and 17 and the ground is provided.
A high-impedance circuit, a high-frequency short-circuit capacitor 41 connected in parallel to the high-resistance circuit 18 and a high-impedance circuit 1/4 connected in series to the high-resistance circuit 18 and having a high characteristic impedance formed on the dielectric substrate. The wavelength line 42 is used. Also in the case of this configuration, loss at a high frequency can be reduced. Also PIN
The operation of the diodes 16 and 17 is the same as that of the embodiment shown in FIGS.

Next, another embodiment of the present invention will be described with reference to FIG. In FIG. 5, FIG.
Are denoted by the same reference numerals, and overlapping description will be omitted. In the case of the embodiment of FIG.
The DC return circuit between the cathodes of 6 and 17 and the ground is
A high resistance 18 connected to the high resistance 18 in parallel and having a high characteristic impedance of 1/4 formed on the dielectric substrate;
An open line 51 having a wavelength and a high resistance 18 connected in series;
1 with high characteristic impedance formed on dielectric substrate
/ 4 wavelength line 52 is used. In this configuration,
The loss at a high frequency can be reduced as compared with the embodiment of FIG. The operations of the PIN diodes 16 and 17 are the same as those in the above-described embodiments.

In the above-described embodiment, the number of the oscillating units is two, but the same applies to the case where the number of the oscillating units is three or more. Also in this case, for example, a resistance element is connected between the power input terminal and the high-frequency output terminal of each oscillation unit,
Further, the configuration is such that the anodes of the PIN diodes are connected to the respective oscillating units.

[0035]

According to the present invention, it is possible to provide an oscillation device which can be reduced in size and cost and suppresses the deterioration of the frequency stability.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing an embodiment of the present invention.

FIG. 2 is a voltage level diagram illustrating the operation of the present invention and a conventional example.

FIG. 3 is a circuit diagram showing another embodiment of the present invention.

FIG. 4 is a circuit diagram showing another embodiment of the present invention.

FIG. 5 is a circuit diagram showing another embodiment of the present invention.

FIG. 6 is a circuit diagram showing a conventional example.

[Explanation of symbols]

 11, 12: Oscillator 13: Oscillator driver 14-14, 15, 18: High resistance 16, 17: PIN diode 19: High frequency short-circuit capacitor.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) H03B 1/00 H03B 5/02-5/04 H01P 5/02

Claims (5)

(57) [Claims] 1. A plurality of oscillating units for generating high-frequency signals having different frequencies, a plurality of oscillating units each having an anode connected to a high-frequency output terminal of each of the plurality of oscillating units, and a plurality of cathodes connected to each other. A PIN diode switch, and a D diode connected between the cathode of the PIN diode and ground.
A C return circuit, an output terminal connected to a cathode of the PIN diode, and a drive power supply that increases as the temperature rises.
Oscillator driver for supplying pressure to the plurality of oscillators
In the oscillation apparatus and a over an oscillation apparatus characterized by connecting a resistive element between said high-frequency output terminal and power input terminal of each of the oscillating unit. 2. The oscillation device according to claim 1, wherein the DC return circuit comprises a resistance element. 3. A DC return circuit comprising a resistor, a high-frequency short-circuit capacitor connected in parallel with the resistor, and a 1/2 capacitor connected in series with the resistor and formed on a dielectric substrate. 2. The oscillation device according to claim 1, wherein the oscillation device comprises a four-wavelength line. 4. A DC return circuit comprising a resistance element, a high-frequency short-circuit capacitor connected in parallel to the resistance element, and a high-frequency coil connected in series to the resistance element. The oscillation device according to claim 1, wherein 5. A DC return circuit, comprising: a resistive element, a 1/4 wavelength open line formed on a dielectric substrate, connected in parallel to the resistive element, and a serial connection to the resistive element; 2. The oscillation device according to claim 1, wherein the oscillation device comprises a quarter-wave line formed on a dielectric substrate.