JP2003188645A - Resonator circuit, voltage controlled oscillator circuit and resonator circuit adjusting method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a resonator circuit, a voltage controlled oscillator circuit and a resonator circuit adjusting method which is intended to broaden the frequency band, improves the efficiency in the manufacturing process, cuts down the number of manufacturing process steps and reduces the cost. <P>SOLUTION: A resonator circuit 13 resonant at a resonance frequency determined, depending on an inductance, has an adjusting means L2 for adjusting the inductance by changing the length of a signal line. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resonance circuit, a voltage controlled oscillator circuit, and a resonance circuit adjusting method, and more particularly to a PL circuit.
The present invention relates to a resonance circuit, a voltage-controlled oscillation circuit, and a resonance circuit adjusting method for outputting at a predetermined frequency according to a voltage supplied into an L (Phase Locked Loop) circuit.

[0002]

2. Description of the Related Art FIG. 3 is an example of a block diagram of a conventional PLL circuit. In FIG. 3, a PLL circuit 1 includes a reference signal oscillator 2, a PC (Phase comparator) 3, and an LP.
F (Low-pass filter) 4, voltage controlled oscillator (VC
O: Voltage controlled oscillator) 5, N frequency divider 6, and output terminal 8.

The reference signal oscillator 2 supplies a reference signal having a reference frequency fr to the PC 3. In the PC 3, the signal of the frequency fr from the reference signal oscillator 2 and the frequency f from the N divider 6
1 / N signal is supplied, and the frequencies fr and f1 / N are 2
A signal according to the phase (frequency) difference between the two signals is supplied to the voltage controlled oscillator circuit 5 via the LPF 4. The voltage controlled oscillator circuit 5 outputs to the output terminal 8 the signal of the frequency f1 whose phase is adjusted by the control signal from the LPF 4. Further, the signal of frequency f1 from the voltage controlled oscillator circuit 5 is supplied to the N frequency divider 6. The N frequency divider 6 divides the frequency f1 of the signal supplied from the voltage controlled oscillator circuit 5 by N to obtain a frequency f1 /
The signal which becomes N is supplied to the PC 3.

In the PLL circuit 1 having the above configuration, the reference frequency f of the reference signal output from the reference voltage oscillator 2 is used.
r and the frequency f1 of the signal output from the voltage controlled oscillator circuit 5 are controlled to have the same frequency, and the controlled signal is output from the output terminal 8. The voltage-controlled oscillation circuit 5 that is controlled so as to output the signal of the desired frequency f1 from the input signal will be described in detail below.

FIG. 4 is an example of a circuit configuration diagram of a conventional voltage controlled oscillator circuit. In FIG. 4, the voltage controlled oscillator circuit 5
Is an input terminal 9, resistance terminals R1 to R4, a capacitor C
1, C3, C4, trimmer capacitor C2, NPN transistor Tr, variable capacitance diode D, inductor L1,
It is composed of the output terminal 10 and the like. The resistor R1, the variable capacitance diode D, the capacitors C1 and C3, the trimmer capacitor C2, and the inductor L1 constitute a resonance circuit 15,
The resistors R2 to R4, the transistor Tr, and the capacitor C4 form an amplifier circuit 16.

One end of the resistor R1 is connected to the input terminal 9, and the other end of the resistor R1 is connected to one end of the capacitor C1. The other end of the resistor R1 is connected to the cathode side of the variable capacitance diode D. The anode side of the variable capacitance diode D is grounded.

The other end of the capacitor C1 is connected to one end of the trimmer capacitor C2, one end of the capacitor C3, and one end of the inductor L1. Trimmer capacitor C2
The other end of is grounded. The other end of the capacitor C3 is connected to the base of the transistor Tr and one end of the resistor R2. The collector of the transistor Tr is connected to one end of the resistor R3 and the output terminal 10. The emitter of the transistor Tr is connected to one end of the capacitor C4 and one end of the resistor R4. The other end of the capacitor C4 and the other end of the resistor R4 are grounded. The other ends of the resistors R2 and R3 are connected to the power supply + Vcc.

Next, the operation of the voltage controlled oscillator circuit 5 will be described. When the control voltage VT is applied from the input terminal 9, the capacitance of the variable capacitance diode D in the resonance circuit 15 changes according to the control voltage VT. When the capacitance of the variable capacitance diode D changes, the resonance frequency of the signal output from the resonance circuit 15 changes. Due to the change in the resonance frequency of the resonance circuit 15, the oscillation frequency of the oscillation signal output from the amplification circuit 16 changes. Therefore, the resonance frequency output from the resonance circuit 15 can be adjusted by adjusting the variable capacitance diode D in the resonance circuit 15.

However, it is not possible to finely adjust the deviation generated in the frequency due to the components of each component and the temperature characteristics only by adjusting the variable capacitance diode D of the conventional voltage controlled oscillator circuit 5. Furthermore, there is a problem that it becomes difficult to synchronize the phase of the signal output from the PLL circuit 1. In order to solve this problem, the control voltage VT applied to the voltage controlled oscillator circuit 5 is set to a predetermined control voltage VT.
It has been necessary to adjust the control voltage VT to a predetermined voltage by adjusting the capacitance of the trimmer capacitor C2 when the voltage controlled oscillator circuit 5 is manufactured.

[0010]

However, the trimmer capacitor C2 used to widen the frequency band of the signal output from the voltage controlled oscillator circuit 5 as described above.
In the process of manufacturing the voltage controlled oscillator circuit, the trimmer capacitor C2 is arranged on the circuit board, the trimmer capacitor C2 is adjusted, and then the frequency shift due to the displacement of the part for varying the capacitance of the trimmer capacitor C2 is performed. In order to prevent it, it is necessary to use a fixing agent or the like and further to fix it by drying it. Therefore, an extra manufacturing process male and equipment are required, which causes a problem of cost increase.

Further, when the pattern of the inductor L1 formed on the substrate of the voltage controlled oscillator circuit is shaved in order to obtain an output signal of a desired frequency from the voltage controlled oscillator circuit, if the pattern is shaved too much, the pattern on the substrate will be There was a problem that could not be fixed.

Therefore, the present invention solves the above problems, widens the frequency band, improves the efficiency of the manufacturing process, reduces the number of manufacturing processes, and reduces the cost. Another object of the present invention is to provide a voltage controlled oscillation circuit and a resonance circuit adjustment method.

[0013]

In the resonance circuit (13) which resonates at the resonance frequency set by the inductance, the inductance can be adjusted by changing the signal line length. It is characterized by having an adjusting means (L2).

According to a second aspect of the present invention, in the first aspect, the adjusting means (L2) is a jumper chip (R).
5) is moved on the pattern.

According to the present invention, the adjusting means (L) for adjusting the inductance by changing the signal line length of the resonance circuit (13).
By having 2), it is possible to output a signal at a desired resonance frequency and to broaden the frequency band. Further, by moving the jumper chip (R5) on the pattern to adjust the inductance, the efficiency of the manufacturing process is improved, the number of manufacturing processes is reduced, and
The cost can be reduced.

According to a third aspect of the present invention, in the voltage controlled oscillator circuit (20), the resonant circuit (13) including an inductance oscillates at a predetermined frequency by a resonant frequency output according to a control voltage. It is characterized in that it has an adjusting means (L2) capable of adjusting the inductance by changing the signal line length so that the control voltage becomes a desired voltage.

According to a fourth aspect of the present invention, in the third aspect, the adjusting means (L2) is a jumper chip (R).
5) is moved on the pattern.

According to the present invention, the voltage controlled oscillator circuit (2
0) has the adjusting means (L2) for adjusting the inductance by changing the signal line length so that the control voltage applied to the desired voltage becomes a desired voltage, so that a signal can be output at a desired resonance frequency. It is possible to widen the band. Also, by moving the jumper chip (R5) on the pattern to adjust the inductance,
The efficiency of the manufacturing process can be improved, the number of manufacturing processes can be reduced, and the cost can be reduced.

According to a fifth aspect of the present invention, in the resonance circuit adjusting method for adjusting the inductance of the resonance circuit (13) including the inductance and outputting at the resonance frequency according to the control voltage, the control voltage is a desired voltage. It is characterized by having an adjustment procedure for adjusting the inductance by changing the signal line length so that

According to a sixth aspect of the present invention, in the fifth aspect, the adjusting procedure adjusts the inductance by moving a jumper chip (R5) on a pattern.

According to the present invention, by adjusting the inductance by changing the signal line length so that the control voltage applied to the resonance circuit (13) becomes a desired voltage, it is possible to output at the desired resonance frequency. Therefore, the frequency band can be widened. Further, by moving the jumper chip (R5) on the pattern to adjust the inductance, the efficiency of the manufacturing process can be improved, the number of manufacturing processes can be reduced, and the cost can be reduced.

The reference numerals in the parentheses are given for easy understanding and are merely examples, and the present invention is not limited to the illustrated modes.

[0023]

1 is a circuit configuration diagram of a power supply control oscillation circuit in an embodiment of the present invention. The power supply control oscillation circuit 20 shown in FIG. 1 is provided in the PLL circuit, and each configuration of the PLL circuit is the same as the configuration shown in FIG. Further, in FIG. 1, the same components as those of the power supply control oscillation circuit shown in FIG. 4 are designated by the same reference numerals, and the description thereof will be omitted. Power supply control oscillation circuit 2 of the present invention
0 is a trimmer capacitor C of the conventional power supply control oscillation circuit 5.
2 is different from the inductor L1 in that a fixed capacitor C5 and a chip resistor R5 are used for the inductor L2. The power control oscillation circuit 20 will be described in detail below.

The voltage controlled oscillator circuit 20 includes an input terminal 11,
Resistance terminals R1 to R4, capacitors C1, C3 to C5, N
It is composed of a PN transistor Tr, a variable capacitance diode D, an inductor L2, an output terminal 12, and the like. Resistance R
1 and variable capacitance diode D and capacitors C1, C3, C
5 and the inductor L2 constitute the resonance circuit 13, and the resistor R
2 to R4, the transistor Tr, and the capacitor C4 form an amplifier circuit 14. One end of the transistor C5 in the resonance circuit 13 is connected to the capacitors C1 and C3 and the inductor L2, and the other ends of the transistor C5 and the inductor L2 are grounded.

Next, the operation of the voltage controlled oscillator circuit 20 will be described. When the control voltage VT is applied from the input terminal 11,
The variable capacitance diode D in the resonance circuit 13 has a control voltage VT.
The capacity changes according to. When the capacitance of the variable capacitance diode D changes, the resonance frequency output from the resonance circuit 13 changes. The oscillation frequency of the oscillation signal output from the amplifier circuit 14 changes due to the change of the resonance frequency of the resonance circuit 13. Therefore, the resonance frequency output from the resonance circuit 13 can be adjusted by adjusting the variable capacitance diode D in the resonance circuit 13.

FIG. 2 is a pattern configuration diagram of the power supply voltage oscillation circuit in one embodiment of the present invention. FIG. 2 shows a pattern formed on the substrate corresponding to the power supply voltage oscillation circuit 20 shown in FIG. The chips in the voltage controlled oscillator circuit 20 can be made conductive by the pattern of the portion surrounded by the dotted line. At one end of the resistor R1 chip,
The control voltage VT is supplied, and the other end of the resistor R1 is connected to the capacitor C1 and one end of the variable capacitance diode D in a pattern. The other end of the capacitor C1 is connected to one end of the chips of the capacitors C3 and C5 and the inductor L2. The other ends of the capacitors C5 and the variable capacitance diode D are grounded.

The other end of the capacitor C3 has a transistor T
The base (B) of the r chip and one end of the chip of the resistor R2 are connected in a pattern. The emitter (E) of the chip of the transistor Tr is connected to one end of the chip of the resistor R4 and the capacitor C4 in a pattern. Transistor T
The collector (C) of the r chip is connected to one end of the chip of the resistor R3. The other ends of the resistors R2 and R3 are connected to a power source (+ Vcc). Also, the resistance R
4 and the other end of the chip of the capacitor C4 and the inductor L2 are grounded.

In the inductor L2, an inductor 17,
A chip (jumper chip) having a resistance R5 of 0Ω is provided. One end of the resistor R5 has capacitors C1, C3,
It is connected to one end of C5 and the other end of resistor R5 is inductor 1
7 is connected to one end. The other end of the inductor 17 is grounded. When the resistor R5 is fixed with solder or the like, within the range of the pattern length Lo which is the signal line length, the arrow A
And the inductance of the inductor L2 is changed. At this time, the resistor R5 is fixed at a predetermined position where the control voltage VT becomes the center voltage of the output signal of the resonance circuit 13.
When the resistor R5 is moved downward in the arrow A, the inductor L
The inductance of the inductor L2 becomes small, and when the resistor R5 is moved in the upward direction of the arrow A, the inductance of the inductor L2 becomes large.

In this way, the resistor R5 is moved within the range of the pattern length Lo which is the signal line length to move the inductor L5.
A desired resonance frequency can be output by adjusting the inductance of 2. In addition, the control voltage VT
By fixing the resistor R5 at a position where is the center voltage of the output signal of the resonance circuit 13, it is possible to widen the band of the signal output from the voltage controlled oscillator circuit 20.

Further, since the voltage can be output from the voltage controlled oscillator circuit 20 at a desired resonance frequency by adjusting the inductance by the resistor R5, the voltage control can be performed without scraping the inductor pattern or using an expensive trimmer capacitor. An oscillator circuit can be configured. Therefore, the manufacturing efficiency of the voltage controlled oscillator circuit can be improved, the number of manufacturing steps can be reduced, and the cost can be reduced.

The present invention is not limited to the above embodiments, and various modifications can be made without departing from the scope of the present invention.

[0032]

According to the resonance circuit, the voltage controlled oscillation circuit and the resonance circuit adjusting method of the present invention, a signal can be output at a desired resonance frequency by changing the signal line length and adjusting the inductance. A wide frequency band can be achieved. Further, by moving the jumper chip on the pattern to adjust the inductance, the efficiency of the manufacturing process can be improved, the number of manufacturing processes can be reduced, and the cost can be reduced.

[Brief description of drawings]

FIG. 1 is a circuit configuration diagram of a voltage controlled oscillator that is an embodiment of the present invention.

FIG. 2 is a pattern configuration diagram of a voltage controlled oscillator circuit according to an embodiment of the present invention.

FIG. 3 is an example of a block configuration diagram of a conventional PLL circuit.

FIG. 4 is an example of a circuit configuration diagram of a conventional voltage controlled oscillator circuit.

[Explanation of symbols]

1 PLL circuit 2 Reference signal oscillator 3 PC (Phase comparator) 4 LPF (Low-pass filter) 5, 20 Voltage controlled oscillator 6 N divider 8, 10, 12 output terminals 9, 11 Input terminals 13,15 Resonant circuit 14, 16 amplifier circuit L1, L2, 17 inductor C1, C3, C4, C5 capacitors C2 trimmer capacitor D variable capacitance diode R1 to R4 resistance Tr transistor

   ─────────────────────────────────────────────────── ─── Continued front page    F term (reference) 5J024 AA10 CA19 CA20 DA03 DA29                       DA32 GA03                 5J081 AA11 CC22 CC46 DD03 DD24                       EE09 EE18 GG01 KK02 KK09                       KK11 KK22 KK27 MM01 MM07                 5J106 AA04 CC01 CC21 CC41 CC52                       JJ01 KK32 KK36 LL01

Claims (6)

[Claims] 1. A resonance circuit which resonates at a resonance frequency set by an inductance, comprising: an adjusting means capable of adjusting the inductance by changing a signal line length. 2. The resonance circuit according to claim 1, wherein the adjusting means moves the jumper chip on the pattern. 3. A voltage controlled oscillator circuit in which oscillation is performed at a predetermined frequency by a resonant frequency output from a resonant circuit including an inductance according to a control voltage, and a signal line length is set so that the control voltage becomes a desired voltage. A voltage-controlled oscillation circuit having an adjusting means capable of adjusting the inductance by changing the voltage. 4. The voltage controlled oscillator circuit according to claim 3, wherein the adjusting means moves the jumper chip in a pattern. 5. A resonance circuit adjusting method for adjusting the inductance of a resonance circuit which includes an inductance and outputs a resonance frequency according to a control voltage, wherein a signal line length is changed so that the control voltage becomes a desired voltage. The method for adjusting a resonance circuit according to claim 1, further comprising an adjustment procedure for adjusting the inductance. 6. The resonance circuit adjusting method according to claim 5, wherein in the adjusting procedure, the inductance is adjusted by moving a jumper chip on a pattern.