JP2006352569A - Pll circuit device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make a circuit device have a configuration which enables use of an interface connector when the control voltage of a voltage controlled oscillator is measured, and to simplify the structure. <P>SOLUTION: Between the control terminal 3B of a VCO 3 and a PLL-IC 14, a connecting wire 15 and a loop filter 16 are connected. The VCO 3 receives an input of a control voltage V to its control terminal 3B from the PLL-IC 14, while outputting an oscillation signal from its output terminal 3C. Moreover, a transmitting circuit 17 and a receiving circuit 18 communicates with an external circuit by an interface connector 20, while performing radio communication by using the oscillation signal of the VCO 3. In this case, until a radio communication device 1 is made into a product, the control voltage V is measured via the terminal 20D of the connector 20 and a wiring conductor 21 by a voltage measuring instrument 23. Consequently, the whole can be miniaturized, since the control voltage V can be measured even if a measuring terminal, a switch, etc. for exclusive use are not provided on a board 2. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a PLL (Phase Locked Loop) circuit device that is preferably used in a wireless communication device such as a wireless device or a mobile phone.

  Generally, a PLL circuit device is mounted on a wireless communication device in order to perform wireless communication at a predetermined oscillation frequency (see, for example, Patent Document 1).

Japanese Patent Laid-Open No. 10-32490

  This type of conventional PLL circuit device includes a voltage controlled oscillator (VCO) having a control terminal and a bias terminal, a PLL-IC (Phase Locked Loop-Integrated Circuit) connected to the output side of the VCO, and a PLL. A loop filter connected between the output side of the IC and the control terminal of the VCO;

  The PLL-IC detects a phase difference between the oscillation signal output from the VCO and a reference signal input from the outside, and outputs a control voltage corresponding to the phase difference. The loop filter takes out a DC component of the control voltage and inputs it to the control terminal of the VCO. As a result, the VCO outputs an oscillation signal at a predetermined frequency corresponding to the control voltage, and the oscillation frequency is feedback-controlled.

  In many cases, a substrate of a PLL circuit device is mounted with a communication circuit that performs wireless communication using, for example, an oscillation signal output from a VCO, and an interface connector that connects the communication circuit to an external circuit. In this case, the communication circuit is configured to perform various communications with an external circuit via the interface connector while transmitting and receiving a radio signal using an oscillation signal of the VCO.

  In the PLL circuit device configured in this way, the oscillation frequency value may deviate from the design standard value due to, for example, characteristic variations of circuit components constituting the VCO. Variations are likely to occur.

  For this reason, in the prior art, a measurement terminal for measuring the value of the control voltage between the VCO and the PLL-IC before the device is commercialized, and this measurement terminal is connected to and disconnected from the circuit on the VCO side. The switch is provided on the substrate.

  For example, when measuring the control voltage of the VCO in a production line of a PLL circuit device or the like, first, with the device activated, the switch is closed and the voltage at the measurement terminal is measured. The difference from the standard value is obtained as a correction bias voltage. Next, with the switch opened, this bias voltage is applied to the bias terminal of the VCO to confirm that the control voltage matches the design standard value.

  By the way, in the above-described conventional technology, a measurement voltage terminal and a switch are provided on the substrate of the PLL circuit device. However, at the time of designing the device, for example, there is a risk that the mounting space for other components will be limited by mounting these measurement terminals and switches on the board, and it will be difficult to reduce the size and thickness of the entire device. There is also a problem that the cost increases.

  The present invention has been made in view of the above-described problems of the prior art, and an object of the present invention is to easily control the VCO control voltage using existing components without mounting a dedicated measurement terminal, switch, or the like. It is an object of the present invention to provide a PLL circuit device that can be measured and can be reduced in size and thickness.

  In order to solve the above-described problems, the present invention provides a voltage-controlled oscillator having a control terminal to which a control voltage is input and outputting an oscillation signal having a frequency corresponding to the control voltage, and connected to the output side of the voltage-controlled oscillator The PLL-IC that compares the phase of the oscillation signal and the reference signal and outputs a control voltage corresponding to the phase difference is connected between the output side of the PLL-IC and the control terminal of the voltage-controlled oscillator. A loop filter for inputting a direct current component of the control voltage to the control terminal; an operating circuit connected to the output side of the voltage controlled oscillator and operating using the oscillation signal; and an interface for connecting the operating circuit to an external circuit The present invention is applied to a PLL circuit device including a connector.

  A feature of the configuration adopted by the invention of claim 1 is that the interface connector terminal is located between the control terminal of the voltage controlled oscillator and the output side of the PLL-IC and measures the control voltage. The configuration is such that possible parts are connected.

  According to a second aspect of the present invention, the terminal that connects the part where the control voltage can be measured is not when the PLL-IC and the voltage-controlled oscillator are activated among the plurality of terminals that constitute the interface connector. It consists of the remaining terminals that are in use.

  According to a third aspect of the present invention, a resistance element is provided between a terminal of the interface connector and a portion where the control voltage can be measured.

  According to a fourth aspect of the present invention, the wiring used for measuring the control voltage and disconnected after the measurement is provided between the terminal of the interface connector and the portion where the control voltage can be measured. Yes.

  According to the first aspect of the present invention, for example, wiring disposed between the control terminal of the voltage controlled oscillator and the PLL-IC can be connected to the terminal of the interface connector. Thus, for example, when inspecting the operating state of the voltage controlled oscillator, it is possible to easily measure the control voltage of the voltage controlled oscillator by using a terminal of the connector or the like by connecting a voltage measuring device to the interface connector. it can.

  For this reason, an interface connector for connecting an operation circuit and an external circuit can be used as a control voltage measurement terminal without mounting a dedicated measurement terminal, switch, or the like in the PLL circuit device as in the prior art. . Therefore, it is not necessary to mount unnecessary parts on the circuit board of the device after the inspection of the PLL circuit device. Therefore, the structure of the entire device can be simplified, the size and thickness of the device can be promoted, and the cost can be reduced. be able to. Further, since the apparatus can be inspected simply by connecting a general-purpose connector provided on a measurement jig such as a voltage measuring instrument to the interface connector, the measurement jig can be easily manufactured.

  According to the second aspect of the present invention, when measuring the control voltage of the voltage controlled oscillator, it is possible to use the remaining terminals that are not in use among the terminals of the interface connector. As a result, the remaining terminals of the connector can be used effectively. For example, even if the PLL circuit device is commercialized as it is after measuring the control voltage, it hardly affects the operating state of the device. Inspection, shipment, etc. can be performed efficiently.

  According to the invention of claim 3, for example, when the operating state of the voltage controlled oscillator is inspected, the control voltage of the voltage controlled oscillator can be measured by the interface connector via the resistance element. In this case, since the resistance element can increase the impedance between the circuit on the oscillator side and the connector, it is ensured that the circuit on the oscillator side and the connector interfere with each other even when they are connected. Can be prevented. Therefore, even if the terminal of the interface connector is used for measuring the control voltage, the PLL circuit device can be stably operated, and the reliability can be improved.

  Further, according to the invention of claim 4, after measuring the control voltage of the voltage controlled oscillator, it becomes possible to cut the unnecessary wiring between the circuit on the oscillator side and the interface connector. Thereby, for example, in a state where the PLL circuit device is commercialized, the circuit on the oscillator side and the connector can be reliably disconnected, and the device can be stably operated by preventing such interference and the like.

  Hereinafter, a PLL circuit device according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

  Here, FIG. 1 and FIG. 2 show a first embodiment, and in this embodiment, a wireless communication device will be described as an example of a PLL circuit device.

  In the figure, reference numeral 1 denotes a wireless communication device as a PLL circuit device provided in, for example, a wireless device, a portable terminal or the like. The wireless communication device 1 includes a substrate 2 and a voltage controlled oscillator 3 described later mounted on the substrate 2. The PLL-IC 14, the connection line 15, the loop filter 16, the transmission circuit 17, the reception circuit 18, the interface connector 20, and the voltage measurement wiring 21 are roughly configured.

  Reference numeral 3 denotes a voltage controlled oscillator (VCO), which is formed as an oscillation circuit having a power supply terminal 3A, a control terminal 3B, and an output terminal 3C. When the control voltage V is input from the PLL-IC 14 to the control terminal 3B, the VCO 3 outputs an oscillation signal having a frequency corresponding to the control voltage V from the output terminal 3C.

  As shown in FIG. 2, the VCO 3 includes, for example, a varicap 4 connected to the control terminal 3B, a capacitor 5 connected between the varicap 4 and the ground, and a varicap 4 with respect to the control terminal 3B. For example, two capacitors 6 and 7 connected in series with each other, for example, an NPN transistor 8 whose base side is connected to the control terminal 3B via the capacitors 6 and 7, and one end side is a capacitor 6 and 7, and the other end is connected to the ground, the other inductance 10, and the capacitors 11, 12, and 13.

  In this case, the inductance 10 is connected between the collector of the transistor 8 and the power supply terminal 3A, and the capacitor 11 is connected between the collector of the transistor 8 and the output terminal 3C. The capacitor 12 is connected between the base and the emitter of the transistor 8, and the capacitor 13 is connected between the emitter of the transistor 8 and the ground.

  Reference numeral 14 denotes a PLL-IC connected to the output terminal 3C of the VCO 3. The PLL-IC 14 is formed as an integrated circuit including a phase comparator, for example, and is connected to a reference signal output circuit or the like (not shown). The PLL-IC 14 compares the phase of the oscillation signal input from the VCO 3 with the reference signal input from the reference signal output circuit, and outputs a control voltage V corresponding to the phase difference between these signals to the output terminal. 14A is output toward the loop filter 16.

  Reference numeral 15 denotes a connection line that connects the control terminal 3B of the VCO 3 and the output terminal 14A of the PLL-IC 14, and this connection line 15 inputs the control voltage V output from the PLL-IC 14 to the VCO 3. V constitutes a measurable part. In this case, the connection line 15 is formed by, for example, printing and applying a conductive material or the like on the substrate 2 or performing a process such as etching on a metal film provided on the substrate 2.

  Reference numeral 16 denotes a loop filter provided in the middle of the connection line 15. The loop filter 16 is constituted by, for example, a low-pass filter or the like, and is provided between the control terminal 3B of the VCO 3 and the output terminal 14A of the PLL-IC 14. . The loop filter 16 takes out a DC component of the control voltage V output from the PLL-IC 14 and inputs this DC component to the control terminal 3B of the VCO 3.

  As a result, the VCO 3 outputs an oscillation signal at a predetermined frequency corresponding to the control voltage V output from the PLL-IC 14, and the oscillation frequency is feedback-controlled.

  Reference numeral 17 denotes a transmission circuit as an operation circuit mounted on the substrate 2, and 18 denotes a reception circuit as another operation circuit mounted on the substrate 2. The transmitting circuit 17 and the receiving circuit 18 are connected to an external circuit (not shown) such as a baseband processing unit using an interface connector 20 described later.

  Here, the baseband processing unit modulates an intermediate frequency signal using, for example, a communication digital signal (baseband signal), and outputs the intermediate frequency signal to the transmission circuit 17 or input from the reception circuit 18. The digital signal is demodulated using the intermediate frequency signal.

  Then, when an intermediate frequency signal is input from the baseband processing unit via the interface connector 20, the transmission circuit 17 mixes this intermediate frequency signal with an oscillation signal input from the VCO 3 and up-converts it to a radio signal. For example, the signal is transmitted from the antenna 19 mounted on the substrate 2 to the outside.

  Further, when receiving the radio signal by the antenna 19, the receiving circuit 18 down-converts the radio signal into an intermediate frequency signal using the oscillation signal of the VCO 3, and the intermediate frequency signal is converted into a baseband processing unit by the interface connector 20. Output.

  Reference numeral 20 denotes an interface connector (hereinafter simply referred to as a connector 20) provided on the substrate 2. The connector 20 is configured using, for example, general-purpose parts having a plurality of terminals, and includes, for example, a baseband processing unit. Various external circuits and the wireless communication apparatus 1 are detachably connected. FIG. 1 illustrates, for example, four terminals 20A, 20B, 20C, and 20D among a plurality of terminals constituting the connector 20.

  The terminals 20A and 20B of the connector 20 are connected to, for example, the transmission circuit 17 and the reception circuit 18, and are used for communication between the circuits 17 and 18 and the baseband processing unit. The terminal 20C is connected to the power supply terminal 3A of the VCO 3, for example, and is used to supply power to the VCO 3 from an external power supply (not shown).

  On the other hand, the terminal 20D is a remaining terminal that is not used when the wireless communication device 1 operates. For this reason, in the present embodiment, when the surplus terminals 20D are connected to the connection line 15 by the voltage measurement wiring 21 described later and the control voltage V of the VCO 3 is measured, these terminals 20D and the voltage measurement wiring 21 are connected. Is used. Note that when the wireless communication device 1 is used, the terminal 20D is opened on the other connector side connected to the interface connector 20, for example.

  Reference numeral 21 denotes a voltage measurement wiring provided on the substrate 2. The voltage measurement wiring 21 is made of a conductive material such as a metal film, for example, and is connected to these in the same process as the connection line 15 and other wirings 22 and the like. Are formed together. One end side of the voltage measurement wiring 21 is connected to the remaining terminal 20 </ b> D of the connector 20.

  Further, the other end side of the voltage measurement wiring 21 is connected to a portion where the control voltage V can be measured between the control terminal 3B of the VCO 3 and the output terminal 14A of the PLL-IC 14. For this reason, when a voltage measuring instrument 23 described later is connected to the connector 20, the control voltage V of the VCO 3 can be measured via the terminal 20 </ b> D of the connector 20 and the voltage measuring wiring 21.

  Reference numeral 22 denotes a plurality of wirings provided in each part of the substrate 2. These wirings 22 are, for example, between the terminals 20A, 20B, and 20C of the connector 20 and the transmission circuit 17, the reception circuit 18, and the power supply terminal 3A of the VCO 3. The output terminal 3C of the VCO 3 and the circuits 17 and 18 are connected.

  On the other hand, in FIG. 1, reference numeral 23 denotes a voltage measuring device used when measuring the control voltage V. The voltage measuring device 23 is, for example, a mating connector detachably connected to the interface connector 20 and a terminal 20D by this connector. And a measurement circuit for measuring the control voltage V via the voltage measurement wiring 21 and a switch (not shown) for connecting and disconnecting the measurement circuit and the connector 20 side.

  The wireless communication apparatus 1 according to the present embodiment has the above-described configuration. Next, the measurement work of the control voltage V performed before commercializing this apparatus will be described.

  This measurement work is performed according to almost the same principle as that of the prior art described in, for example, Japanese Patent Laid-Open No. 10-32490. At the start of the work, the voltage is first applied to the interface connector 20 of the wireless communication apparatus 1 to be measured. The connector of the measuring instrument 23 is connected. The VCO 3 is locked at a certain oscillation frequency by operating the VCO 3, PLL-IC 14, etc. with the switch of the voltage measuring device 23 opened.

  Next, the switch is closed, and the control voltage V is measured by the voltage measuring instrument 23 via the terminal 20D of the connector 20 and the voltage measuring wiring 21. Then, the measured value of the control voltage V and a desired voltage value (for example, a design standard value or the like) can be compared and used for selection. Moreover, when it deviates from a desired voltage value, it can be used to correct the control voltage by an arbitrary adjustment method.

  Next, the operation of the wireless communication apparatus 1 will be described. First, when the interface connector 20 is connected to an external circuit or the like including a baseband processing unit and the power is turned on, the VCO 3 is energized from the power source through the terminal 20C of the interface connector 20. And VCO 3 is activated.

  The VCO 3 outputs an oscillation signal at a frequency corresponding to the control voltage V, and the oscillation frequency is feedback-controlled by the PLL-IC 14. Thus, the transmission circuit 17 and the reception circuit 18 can perform a radio signal transmission operation and a reception operation while communicating with the baseband processing unit by the terminals 20A and 20B of the interface connector 20.

  Thus, according to the present embodiment, since the terminal 20D of the interface connector 20 is connected between the control terminal 3B of the VCO 3 and the PLL-IC 14 by the voltage measurement wiring 21, for example, the operating state of the VCO 3 is changed. When inspecting, by connecting the voltage measuring device 23 to the connector 20, the control voltage V of the VCO 3 can be easily measured using the terminal 20D or the like.

  For this reason, the interface connector 20 for connecting the circuits 17 and 18 on the board 2 to the external circuit is connected to the control voltage V without mounting a dedicated measurement terminal, switch or the like on the board 2 as in the prior art. It can be used as a measurement terminal.

  Accordingly, unnecessary parts after the inspection of the wireless communication apparatus 1 do not have to be mounted on the apparatus, so that the structure of the entire apparatus can be simplified, the size and thickness thereof can be promoted, and the cost can be reduced. it can.

  In particular, in the present embodiment, the remaining terminal 20 </ b> D that is not used when the wireless communication apparatus 1 is operated among the terminals of the connector 20 is used for the measurement of the control voltage V. Thereby, the surplus terminal 20D of the connector 20 can be used effectively. For example, even if the wireless communication device 1 is commercialized as it is after the measurement of the control voltage V, the operation state of the device is hardly affected. Therefore, it is possible to efficiently inspect and ship the apparatus.

  Further, for example, the wireless communication device 1 can be inspected simply by connecting a general-purpose connector provided on a measurement jig such as the voltage measuring instrument 23 to the interface connector 20, and thus the measurement jig is easily manufactured. be able to.

  Next, FIG. 3 shows a second embodiment according to the present invention. The feature of this embodiment is that a resistance element is provided between a terminal of the interface connector and a portion where the control voltage can be measured. There is. In the present embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  Reference numeral 31 denotes a wireless communication device. The wireless communication device 31 includes the substrate 2, the VCO 3, the PLL-IC 14, the connection line 15, the loop filter 16, the transmission circuit 17, the reception circuit 18, almost the same as in the first embodiment. The interface connector 20 and the voltage measurement wiring 32 are included. However, for example, a resistance element 33 having high impedance is provided in the middle of the voltage measurement wiring 32.

  The resistance element 33 is interposed between the circuit on the VCO 3 side and the circuit on the connector 20 side with a high impedance at the position of the voltage measurement wiring 32, and interference or the like occurs between these circuits through the voltage measurement wiring 32. Is preventing.

  Thus, in the present embodiment configured as described above, it is possible to obtain substantially the same operational effects as those of the first embodiment. In particular, in the present embodiment, a resistance element 33 having a high impedance is provided in the middle of the voltage measurement wiring 32.

  Thus, for example, when the wireless communication device 31 is used, the impedance between the circuit on the VCO 3 side and the circuit on the connector 20 side can be increased by the resistance element 33 at the position of the voltage measurement wiring 32.

  Therefore, even when the voltage measurement wiring 32 is connected between these circuits, interference such as electromagnetic noise from the circuit around the voltage measurement wiring 32 or the circuit around the connector 20 to the VCO 3 side can be prevented. For this reason, even if the terminal 20D of the interface connector 20 is used for the measurement of the control voltage V, the wireless communication device 31 can be stably operated, and the reliability can be improved.

  Next, FIG. 4 shows a third embodiment according to the present invention. The feature of this embodiment is that the wiring for measuring the control voltage is cut after the measurement. In the present embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  41 is a wireless communication device, and the wireless communication device 41 has a voltage measurement wiring 42 for measuring the control voltage V of the VCO 3 in substantially the same manner as in the first embodiment. For example, when the wireless communication device 41 is manufactured, that is, before measuring the control voltage V, the connection line 15 and the terminal 20D of the connector 20 are connected as shown by a virtual line in FIG. Yes.

  However, after measuring the control voltage V, the voltage measurement wiring 42 is cut by a cutting tool such as a router or a means such as a laser. Therefore, in a state where the wireless communication device 41 is commercialized, a cutting portion 42A is formed in the middle of the voltage measurement wiring 42, and the circuit on the VCO 3 side and the circuit on the interface connector 20 side pass through the voltage measurement wiring 42. Connection is interrupted.

  Thus, in the present embodiment configured as described above, it is possible to obtain substantially the same operational effects as those of the first embodiment. Particularly in this embodiment, after the control voltage V of the VCO 3 is measured, the voltage measurement wiring 42 that is no longer necessary between the circuit on the VCO 3 side and the circuit on the connector 20 side can be disconnected.

  Thereby, for example, in a state where the wireless communication device 41 is commercialized, the circuit on the VCO 3 side and the circuit on the connector 20 side can be surely cut off, and interference between these circuits can be prevented and the device can be stably operated. Can be operated.

  Next, FIG. 5 shows a fourth embodiment according to the present invention. The feature of this embodiment is that a part of the substrate of the device is separated together with the voltage measurement wiring after measuring the control voltage. It is to have done. In the present embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  Reference numeral 51 denotes a wireless communication device, and the wireless communication device 51 includes a substrate 52, a VCO 3, a PLL-IC 14, a connection line 15, a loop filter 16, a transmission circuit 17, a reception circuit 18, almost the same as in the first embodiment. The interface connector 20 and the voltage measurement wiring 53 are included.

  Here, the substrate 52 is formed integrally with the ear portion 52A indicated by the phantom line in FIG. 5 at a time point before the control voltage V of the VCO 3 is measured. In this state, the voltage measurement wiring 53 is formed so that, for example, the middle portion in the length direction is substantially U-shaped and extends from the substrate 52 to the ear 52A side, and the connection line 15 and the terminal 20D of the connector 20 are formed. And connected.

  However, after measuring the control voltage V, the ear portion 52A is separated from the substrate 52 together with the cutting portion 53A of the voltage measurement wiring 53. For this reason, in a state where the wireless communication device 51 is commercialized, the voltage measurement wiring 53 is cut off halfway, and the connection via the voltage measurement wiring 53 is cut off between the circuit on the VCO 3 side and the circuit on the interface connector 20 side. Has been.

  Thus, in the present embodiment configured as described above, it is possible to obtain substantially the same operational effects as those of the first and third embodiments. In particular, in the present embodiment, after the control voltage V of the VCO 3 is measured, the cutting portion 53A of the voltage measurement wiring 53 is cut together with the ear portion 52A of the substrate 52.

  This eliminates the need for a step of selectively cutting only the voltage measurement wiring 53 when the wireless communication device 51 is manufactured. For example, the step of separating the substrate 52 is used to efficiently cut the voltage measurement wiring 53. This can increase productivity.

  Next, FIG. 6 shows a fifth embodiment according to the present invention. The feature of the present embodiment is that the interface connector has a configuration in which a circuit connection terminal is also used as a voltage measurement terminal. In the present embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  61 is a wireless communication device, and the wireless communication device 61 is similar to the fifth embodiment in that the substrate 62, the VCO 3, the PLL-IC 14, the connection line 15, the loop filter 16, the transmission circuit 17, the reception circuit 18, The interface connector 20 and a voltage measurement wiring 67 described later are included. However, an auxiliary circuit 63 described later is mounted on the substrate 62.

  Reference numeral 63 denotes an auxiliary circuit mounted on the substrate 62. The auxiliary circuit 63 is composed of, for example, one or a plurality of elements. In this case, the auxiliary circuit 63 may be a part of the transmission circuit 17 or the reception circuit 18, for example. In addition, the auxiliary circuit 63 is connected to the terminal 20D ′ of the connector 20 by a wiring 64 provided on the substrate 62, a connection pad 65, and solder 66 described later in a state where the wireless communication device 61 is commercialized. The auxiliary circuit 63 performs various operations, signal processing, and the like while communicating with an external circuit via the connector 20 or being energized when the wireless communication device 61 operates.

  Reference numeral 65 denotes, for example, two connection pads provided in the middle of the wiring 64. These connection pads 65 are connected to each other by solder 66 when the wireless communication device 61 is commercialized, thereby bringing the wiring 64 into a conductive state. keeping.

  Reference numeral 67 denotes a voltage measurement wiring 67 provided on the substrate 62. The voltage measurement wiring 67 is substantially the same as in the fifth embodiment. Disconnected.

  Here, for example, when the wireless communication device 61 is manufactured, the connection line 15 and the terminal 20 </ b> D ′ of the connector 20 are connected by the voltage measurement wiring 67. At this time, each connection pad 65 is not connected by the solder 66, and the auxiliary circuit 63 is insulated from the terminal 20D '. Therefore, the control voltage V of the VCO 3 can be measured using the terminal 20D ′ and the voltage measurement wiring 67.

  On the other hand, when the wireless communication device 61 is commercialized after measuring the control voltage V, the ear portion 62A of the substrate 62 is cut and the connection pads 65 are connected to each other by the solder 66. As a result, the terminal 20D ′ of the connector 20 is disconnected from the circuit on the VCO 3 side and connected to the auxiliary circuit 63. As described above, the terminal 20D ′ of the connector 20 serves as both a terminal for measuring the control voltage V of the VCO 3 and a terminal used for connection of the auxiliary circuit 63 after the voltage measurement.

  Thus, in the present embodiment configured as described above, it is possible to obtain substantially the same operational effects as those of the first, third and fourth embodiments. In particular, in the present embodiment, since the terminal for measuring the control voltage V of the VCO 3 and the terminal used for connection of the auxiliary circuit 63 after the voltage measurement are combined, for example, the connector 20 has a surplus. Even when there is no terminal, the control voltage V can be measured by temporarily using the terminal 20D ′ to be used, and a terminal for voltage measurement can be easily secured.

  In addition, since two connection pads 65 soldered to each other are provided between the terminal 20D 'of the connector 20 and the auxiliary circuit 63, the auxiliary circuit 63 and the terminal 20D' Can be shut off.

  As a result, it is possible to prevent the measurement accuracy of the control voltage V from being lowered due to the influence of the auxiliary circuit 63, and to prevent the auxiliary circuit 63 from being adversely affected by the voltage measurement operation, and the apparatus can be inspected smoothly. At the end of the measurement, the wireless communication device 61 can be easily commercialized by soldering the connection pads 65, cutting the substrate 62, and the like.

  In each of the above embodiments, the baseband processing unit is arranged outside the wireless communication device 1, and the baseband processing unit is connected to the wireless communication device 1 through the interface connector 20. However, the present invention is not limited to this. For example, a baseband processing unit is also mounted on the substrate 2 together with the transmission circuit 17 and the reception circuit 18, and the interface connector 20 connects other external circuits to these circuits. It is good also as a structure.

  In the embodiment, the terminals 20D and 20D ′ of the interface connector 20 are connected between the control terminal 3B of the VCO 3 and the output side of the loop filter 16. However, the present invention is not limited to this, and these terminals may be connected between the output terminal 14 </ b> A of the PLL-IC 14 and the input side of the loop filter 16.

  In the embodiment, the transmission circuit 17 and the reception circuit 18 are described as examples of the operation circuit. However, the present invention is not limited to these circuits 17 and 18 and may be applied to other operation circuits that operate by the oscillation signal of the VCO 3.

  On the other hand, in the embodiment, a configuration using the resistance element 33, a configuration in which the voltage measurement wiring 42 is cut, a configuration in which the ear portion 52A of the substrate 52 is separated, and the terminal 20D 'of the connector 20 is connected to the voltage measurement terminal and auxiliary circuit. The configuration that also serves as the terminal for 63 has been described as an example. However, the present invention is not limited to this, and a PLL circuit device may be configured by combining any two of the first to fifth embodiments or combining three or more embodiments. Good.

  In the second embodiment, the voltage measurement wiring 42 is cut at the position of the cutting portion 42A. However, the present invention is not limited to this, and in the middle of the voltage measurement wiring, in the same way as in the fifth embodiment, two connection pads connected to each other by soldering are provided, and the voltage measurement wiring is not cut. Alternatively, the solder between the connection pads may be removed.

  In the fifth embodiment, the connection pad 65 is provided between the terminal 20D ′ of the connector 20 and the auxiliary circuit 63. However, in the present invention, the connection pad 65 is not necessarily required. For example, the terminal 20D ′ of the connector 20 and the auxiliary circuit 63 are always connected by wiring or the like, and the control voltage V is set by the voltage measurement wiring 67 in this state. It is good also as a structure which measures.

  Furthermore, in the embodiment, the wireless communication devices 1, 31, 41, 51, and 61 have been described as examples of the PLL circuit device. However, the present invention is not limited to this, and can be applied to various communication devices including, for example, a wireless device, a mobile phone, and other mobile terminals.

1 is a circuit configuration diagram showing a wireless communication apparatus according to a first embodiment of the present invention. It is a circuit block diagram which shows the voltage controlled oscillator in FIG. It is a circuit block diagram which shows the radio | wireless communication apparatus by the 2nd Embodiment of this invention. It is a circuit block diagram which shows the radio | wireless communication apparatus by the 3rd Embodiment of this invention. It is a circuit block diagram which shows the radio | wireless communication apparatus by the 4th Embodiment of this invention. It is a circuit block diagram which shows the radio | wireless communication apparatus by the 5th Embodiment of this invention.

Explanation of symbols

1, 31, 41, 51, 61 Wireless communication device (PLL circuit device)
2, 52, 62 Substrate 3 Voltage controlled oscillator 3A Power supply terminal 3B Control terminal 3C Output terminal 14 PLL-IC
14A Output terminal 15 Connection line 16 Loop filter 17 Transmission circuit (operation circuit)
18 Receiver circuit (actuation circuit)
20 Interface connector 20A, 20B, 20C, 20D, 20D 'Terminal 21, 32, 42, 53, 67 Voltage measurement wiring 33 Resistance element 42A, 53A, 67A Cutting part 52A, 62A Ear part 63 Auxiliary circuit 65 Connection pad 66 Solder V control voltage

Claims (4)

A voltage controlled oscillator having a control terminal to which a control voltage is input and outputting an oscillation signal having a frequency corresponding to the control voltage, and a phase of the oscillation signal and a reference signal connected to the output side of the voltage controlled oscillator are compared. A PLL-IC that outputs a control voltage corresponding to the phase difference, and a DC component of the control voltage that is connected between the output side of the PLL-IC and the control terminal of the voltage-controlled oscillator is input to the control terminal. A PLL circuit device comprising: a loop filter that operates; an operating circuit that is connected to an output side of the voltage-controlled oscillator and operates using the oscillation signal; and an interface connector that connects the operating circuit to an external circuit.
The interface connector terminal is configured to connect a portion which can be measured between the control terminal of the voltage controlled oscillator and the output side of the PLL-IC and can measure the control voltage. Circuit device.   The terminal that connects the part capable of measuring the control voltage is a remaining terminal that is not used when the PLL-IC and the voltage-controlled oscillator are operated among a plurality of terminals constituting the interface connector. Item 2. The PLL circuit device according to Item 1.   The PLL circuit device according to claim 1, wherein a resistance element is provided between a terminal of the interface connector and a portion where the control voltage can be measured.   4. The wiring according to claim 1, wherein a wiring that is used when measuring the control voltage and is cut after the measurement is provided between the terminal of the interface connector and a portion where the control voltage can be measured. PLL circuit device.

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