JP2006093819A - High frequency circuit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a downsized high frequency circuit at a low cost by limiting the number of stages of a local oscillation amplifier. <P>SOLUTION: The high frequency circuit with a configuration for feeding local oscillation signals to a plurality of feeding destinations includes: a first local oscillator 31 provided in common to the plurality of feeding destinations; a power distributor 33 for distributing the local oscillation signals from the local oscillator 31 to the plurality of feeding destinations; and a plurality of multipliers 34a, 34b provided corresponding to the plurality of feeding destinations and for respectively feeding the local signal resulting from multiplying a local signal from the local oscillator by the same degree via the distributor to each feeding destination. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a high-frequency circuit including a transmission system and a reception system, or a plurality of transmission systems, or a plurality of reception systems, and a local oscillation system including a multiplier.

  Conventionally, as this type of high-frequency circuit, a local oscillator common to the transmission system and the reception system, a multiplier that multiplies the high-frequency signal generated by the local oscillator to, for example, twice the frequency, and power that distributes the output of the multiplier Some include a distributor and a multi-stage amplifier that amplifies the distribution output and outputs the amplified output to a transmission mixer and a reception mixer, respectively (see, for example, Non-Patent Document 1).

  In this high-frequency circuit, the transmission IF signal input to the transmission IF signal terminal is frequency-converted into a high-frequency band signal in the transmission mixer, amplified by a transmission amplifier, and then radiated as a radio wave from a transmission / reception antenna via a circulator. . On the other hand, the received signal in the high frequency band received by the transmission / reception antenna is amplified by the low noise amplifier via the circulator, converted into a signal in the IF frequency band by the reception mixer, and output from the reception IF signal terminal.

  Here, the local oscillation signal of the transmission mixer is obtained by multiplying the high-frequency signal generated by the local oscillator to twice the frequency by the multiplier and amplifying by a multi-stage local oscillation amplifier through a power distributor. is there. Since it operates in a frequency band twice that of the local oscillator output, it is difficult to obtain a high gain, and the local amplifier often has a multistage configuration. The local oscillator signal of the receiving mixer is obtained by amplifying a signal generated by a local oscillator and a multiplier common to the local oscillator signal of the transmitting mixer by a multistage amplifier through a power distributor.

  In the conventional high-frequency circuit described above, each local oscillation signal of the transmission system and the reception system is an output signal obtained by multiplying the oscillation output generated by the common local oscillation source by the same order, so that a common local oscillator and multiplier are used. Therefore, it is possible to reduce the size as compared with the case where each transmission / reception has a separate local oscillation system.

  Here, a high-frequency circuit having one system each for transmission and reception has been described, but in a high-frequency circuit having two transmission systems or two reception systems, similarly, a local oscillator and a multiplier can be used in common. Miniaturization is possible.

2000 IEICE Electronics Society Conference Proceedings C-2-37, page 64

  As described above, in the conventional high-frequency circuit, when the local oscillator signal is supplied to a plurality of power supply destinations, since both the local oscillator and the multiplier are shared, the local oscillator signal is distributed to the respective power supply destinations. • It was necessary to feed power in a frequency band twice that of the local oscillator output signal. For this reason, in a relatively high frequency band where it is difficult to obtain a sufficient gain of the amplifier or a relatively large feed line loss, the loss of the power divider and the loss of the feed line connecting the power divider and the local oscillator amplifier are reduced. There is a problem in that the number of stages of the local amplifier to compensate increases.

  The present invention has been made to solve the above-described problems, and realizes a high-frequency circuit that is reduced in size and cost by suppressing an increase in the number of stages of local oscillators.

  The high-frequency circuit according to the present invention is a transmitter / receiver for transmitting and receiving in a transmitter / receiver that uses a local output signal of a transmission system and a reception system as an output signal obtained by multiplying an oscillation output generated by a common local source by the same order. It is characterized by having an independent local frequency multiplier.

  According to the present invention, the local oscillator is used in common, and the local oscillation signal is distributed to a plurality of power supply destinations in the same frequency band as the local oscillation signal from the local oscillator. By multiplying the frequency to the order frequency and supplying power, the local oscillator signal is distributed and supplied to multiple power supply destinations at half the conventional frequency, and the number of local amplifiers to compensate for these losses is reduced. The circuit can be miniaturized.

Embodiments of the present invention will be described below with reference to the drawings.
Embodiment 1 FIG.
1 is a block diagram showing a configuration of a high-frequency circuit according to Embodiment 1 of the present invention. The high-frequency circuit shown in FIG. 1 includes a single local oscillator 31 provided in common to a transmission system and a reception system that are a plurality of power supply destinations of a local oscillation signal, a local oscillation signal from the local oscillator 31 and a transmission system. A power distributor 33 serving as a distribution unit that distributes corresponding to the receiving system, and a local amplifier 35a having the same frequency band as the output of the local oscillator 31 that amplifies the local oscillator signal from the local oscillator 31 via the power distributor 33. , 35b, multipliers 34a and 34b for multiplying the local oscillation signal through the local oscillation amplifiers 35a and 35b by the same order as the output of the local oscillator 31, and outputting the local oscillation signal through the multipliers 34a and 34b. And local amplifiers 36a and 36b that amplify the frequency band to be twice the output of the local oscillator 31, and supply local signals from the local amplifiers 36a and 36b to the transmission system and the reception system, respectively. Yes.

  The transmission system includes a transmission mixer 11 that converts the frequency of the transmission IF signal input to the transmission IF signal terminal 1 into a high frequency band signal, and a transmission amplifier 12 that amplifies the output of the transmission mixer 11. The amplified signal is radiated as a radio wave from the transmitting / receiving antenna 26 via the circulator 21.

  As a receiving system, a high-frequency band received signal received by the transmitting / receiving antenna 26 is received via the circulator 21, and the low-noise amplifier 15 that amplifies and the output of the low-noise amplifier 15 is frequency-converted into an IF frequency-band signal. A reception mixer 16, and the output of the reception mixer 16 is output from the reception IF signal terminal 2.

  Next, the operation will be described. The transmission IF signal input to the transmission IF signal terminal 1 is frequency-converted into a high-frequency band signal by the transmission mixer 11, amplified by the transmission amplifier 12, and then radiated from the transmission / reception antenna 26 via the circulator 21. . A high frequency band reception signal received by the transmission / reception antenna 26 is amplified by the low noise amplifier 15 via the circulator 21, frequency-converted to an IF frequency band signal by the reception mixer 16, and output from the reception IF signal terminal 2. Is done.

  Here, the local oscillation signal of the transmission mixer 11 is distributed by the power divider 33 after the high frequency signal generated by the local oscillator 31 is amplified by the local oscillation amplifier 35a, and then multiplied to a double frequency by the multiplier 34a. And amplified by the local amplifier 36a. The local oscillator signal of the reception mixer 16 is amplified by the local oscillator amplifier 35b after the signal generated by the local oscillator 31 common to the local oscillator signal of the transmission mixer 11 is distributed by the power divider 33, and the multiplier 34b. Is multiplied by twice the frequency and amplified by the local amplifier 36b.

  Therefore, according to the first embodiment, the local oscillation signals of the transmission system and the reception system are output signals obtained by multiplying the oscillation output generated by the common local oscillation source by the same order. A common local oscillator 31 can be used, and distribution and power feeding to the transmission system and the reception system are performed at the same frequency as the output of the local oscillator 31, so that these losses can be suppressed. Also, since the operating frequency of the local amplifier that compensates for these losses may be half the conventional frequency band, the gain is high and the number of amplifier stages can be reduced. Further, since the multipliers 34a and 34b can be arranged in the vicinity of the transmission mixer and the reception mixer, the feeding distance of the signal in the frequency band twice the local oscillator output can be shortened, and the mixer output can be reduced. Can be reduced. For this reason, by providing the multipliers independently in the transmission system and the reception system, it is possible to reduce the number of stages of the local oscillation amplifier and to reduce the size of the high-frequency circuit.

  Here, the power distributor 33 is used as a distributor when power is supplied to the transmission system and the reception system. However, when transmission and reception are performed in a time-sharing manner, a high-frequency switch may be used. The same effect is produced. Similarly, the circulator 21 connected to the transmission / reception antenna 26 may be replaced with a transmission / reception changeover switch. Alternatively, the same effect can be obtained by using separate antennas for transmission and reception. Further, when transmission / reception is performed by frequency division, a duplexer may be used instead of the circulator.

  In addition, here, the multiplication order has been described as secondary, but other orders may be used. FIG. 2 is a block diagram showing the configuration of a high-frequency circuit as an example when the multiplication order is sixth. In the high frequency circuit shown in FIG. 2, the sixth order is realized by the triple multiplier 37 and the double multipliers 34a and 34b. Further, a changeover switch 70 is provided instead of the distributor 33 shown in FIG. In the case of 6-fold multiplication, only the local oscillator 31 may be shared by the transmission / reception system, and a 6-fold multiplication circuit may be provided for each of the transmission system and the reception system. However, as shown in FIG. It is possible to reduce the size by dividing the multiplier 37 and the doublers 34a and 34b up to a tripler output having a relatively low frequency. The same effect can be obtained by using a power distributor instead of the changeover switch 70. Further, the circulator 21 connected to the transmission / reception antenna 26 may be replaced with a transmission / reception selector switch. Alternatively, the same effect can be obtained by using separate antennas for transmission and reception. Further, when performing transmission / reception by frequency division, a duplexer may be used instead of the circulator 21.

Embodiment 2. FIG.
In the first embodiment described above, an example of a high-frequency circuit that constitutes a transmission / reception system that includes a transmission system and a reception system as power supply destinations of local oscillation signals and that includes a multiplier independent of each of the transmission system and the reception system is shown. However, in the second embodiment, a high-frequency circuit that constitutes a transmission system that includes different modulators or frequency converters as power supply destinations of local oscillation signals and that includes independent multipliers in different modulators or frequency converters. An example is shown.

  FIG. 3 is a block diagram showing the configuration of the high-frequency circuit according to Embodiment 2 of the present invention. In the second embodiment shown in FIG. 3, the same parts as those in the first embodiment shown in FIG. The high-frequency circuit according to the second embodiment shown in FIG. 3 includes a QPSK (Quadrature Phase Shift Keying) modulator (QPSK-MOD) 51 and an ASK (Amplitude Shift Keying) modulator (ASK- MOD) 52, QPSK modulator 51 and ASK modulator 52 are provided with independent multipliers 34 a and 34 b, respectively, and are provided with changeover switch 71 instead of circulator 21, and signals via changeover switch 71 are provided. A transmission system is configured which is amplified by the transmission amplifier 12 and radiated as a radio wave from the transmission antenna 27. Reference numerals 60 and 61 denote transmission I channel baseband signal terminals and transmission Q channel baseband signal terminals, and reference numeral 62 denotes a transmission ASK baseband signal terminal.

  Next, the operation will be described. QPSK baseband modulation signals I and Q are input to I channel and Q channel baseband signal terminals 60 and 61, respectively, and are quadrature-modulated by a QPSK modulator 51 into a high frequency band signal, and transmitted via a changeover switch 71. Amplified by the amplifier 12 and a radio wave is radiated from the transmitting antenna 27. On the other hand, the ASK baseband modulation signal is input to the baseband signal terminal 62, modulated into a high frequency band signal by the ASK modulator 52, amplified by the transmission amplifier 12 via the changeover switch 71, and transmitted from the transmission antenna 27 to the radio wave. Is emitted. That is, the selector switch 71 selects one of the QPSK modulation signal via the QPSK modulator 51 and the ASK modulation signal via the ASK modulator 52, and performs transmission.

  Here, the local oscillation signal of the QPSK modulator 51 is obtained by distributing the high frequency signal generated by the local oscillator 31 by the power divider 33, amplifying it by the local amplifier 35a, and then double the frequency by the multiplier 34a. This is multiplied and amplified by the local amplifier 36a. On the other hand, the local oscillator signal of the ASK modulator 52 is a signal generated by the local oscillator 31 shared with the local oscillator signal of the QPSK modulator 51, distributed by the power divider 33, amplified by the local amplifier 35b, and then multiplied by the multiplier. The frequency is doubled by 34b and amplified by the local amplifier 36b.

  Therefore, according to the second embodiment, since the local oscillation signals of the QPSK modulation system and the ASK modulation system are output signals obtained by multiplying the oscillation output generated by the common local oscillation source by the same order, The oscillator 31 can be used, and these losses can be suppressed by performing distribution and feeding to the QPSK modulation system and the ASK modulation system at the same frequency as the output of the local oscillator 31. Also, since the operating frequency of the local amplifier that compensates for these losses may be half the conventional frequency band, the gain is high and the number of amplifier stages can be reduced. Further, since the multipliers 34a and 34b can be arranged in the vicinity of the QPSK modulator 51 and the ASK modulator 52, the feeding distance of the signal in the frequency band twice that of the local oscillator output can be shortened. The power supply loss from the output of each modulator to each modulator can be reduced. For this reason, by providing a multiplier in each individual transmission system, the number of stages of the local oscillation amplifier can be reduced, and the high-frequency circuit can be miniaturized.

  Here, the power distributor 33 is used to supply the local signal to the QPSK modulation system and the ASK modulation system, but the same effect can be obtained by using a high-frequency switch instead. Further, although the case where QPSK modulation and ASK modulation are used as two different modulation systems has been described, the same effect can be obtained even if a plurality of other modulation schemes are used. The modulation system may be three systems instead of two systems, and the same effect can be obtained if there are a plurality of systems. Furthermore, although the case where the direct modulator is used has been described here, the frequency converter (transmission mixer) is configured such that one is a direct modulator and the other is not a baseband signal input but an IF signal input. The frequency converter (transmission mixer) provided with different IF signal inputs may be used. Further, even if the multiplication order is not only the second order but also a higher order such as the third order or the sixth order, the same effect is obtained. Furthermore, regarding the arrangement of the higher-order multipliers, the same arrangement as that shown in FIG. 2 is possible.

Embodiment 3 FIG.
In the second embodiment described above, an example of a high-frequency circuit that constitutes a transmission system that includes different modulators or frequency converters as power supply destinations of local oscillation signals and that includes independent multipliers in different modulators or frequency converters. In the third embodiment, a receiving system including different demodulator or frequency converter as a power supply destination of a local oscillation signal and a multiplier independent of each other demodulator or frequency converter is configured. An example of a high-frequency circuit is shown.

  FIG. 4 is a block diagram showing the configuration of the high-frequency circuit according to Embodiment 3 of the present invention. In the third embodiment shown in FIG. 4, the same parts as those in the first or second embodiment shown in FIG. 1 to FIG. The high-frequency circuit according to the third embodiment shown in FIG. 4 includes an ASK demodulator (ASK-DEMOD) 53 and a QPSK demodulator (QPSK-DEMOD) 54 as power supply destinations for local signals, and an ASK demodulator. 53 and QPSK demodulator 54 are respectively provided with independent multipliers 34a and 34b, and are provided with a changeover switch 71 instead of a circulator, and a low-frequency amplifier 15 amplifies the received signal in the high frequency band received by the receiving antenna 28, A receiving system is configured to input to either the ASK demodulator 53 or the QPSK demodulator 54 via the changeover switch 71. Reference numeral 63 denotes a reception ASK baseband signal terminal, and reference numerals 64 and 65 denote a reception I channel baseband signal terminal and a reception Q channel baseband signal terminal.

  Next, the operation will be described. The received signal in the high frequency band received by the receiving antenna 28 is amplified by the low noise amplifier 15 and input to either the ASK demodulator 53 or the QPSK demodulator 54 via the changeover switch 71. When the ASK demodulator 53 is selected, the reception signal in the high frequency band is demodulated by the ASK demodulator 53 and output to the reception ASK baseband signal terminal 63. When the QPSK demodulator 54 is selected, the received signal in the high frequency band is demodulated by the QPSK demodulator and output to the reception I channel baseband signal terminal 64 and the reception Q channel baseband signal terminal 65.

  Here, the local oscillator signal of the ASK demodulator 53 is a high frequency signal generated by the local oscillator 31, distributed by the power distributor 33, amplified by the local amplifier 35a, and then doubled by the multiplier 34a. This is multiplied and amplified by the local amplifier 36a. On the other hand, the local oscillator signal of the QPSK demodulator 54 is a signal generated by the local oscillator 31 common to the local oscillator signal of the ASK demodulator 53, distributed by the power divider 33, amplified by the local amplifier 35b, and then multiplied. The frequency is doubled by 34b and amplified by the local amplifier 36b.

  Therefore, according to the third embodiment, since the local oscillation signals of the ASK demodulation system and the QPSK demodulation system are output signals obtained by multiplying the oscillation output generated by the common local source by the same order, The oscillator 31 can be used, and these losses can be suppressed by performing distribution and feeding to the ASK demodulation system and the QPSK demodulation system at the same frequency as the output of the local oscillator 31. Also, since the operating frequency of the local amplifier that compensates for these losses may be half the conventional frequency band, the gain is high and the number of amplifier stages can be reduced. Since the multipliers 34a and 34b can be arranged in the vicinity of the ASK demodulator 53 and the QPSK demodulator 54, the feeding distance of the signal in the frequency band twice that of the local oscillator output can be shortened. To the power supply loss from each demodulator. For this reason, by providing each of the multipliers in each individual reception system, the number of stages of the local oscillation amplifier can be reduced, and the high-frequency circuit can be miniaturized.

  Here, the power distributor 33 is used to supply the local oscillation signal to the ASK demodulator 53 and the QPSK demodulator 54. However, the same effect can be obtained by using a high frequency switch. In addition, although the ASK demodulation system and the QPSK demodulation system have been described as two different demodulation systems, the same effects can be obtained with demodulation systems of a plurality of other modulation schemes. The demodulating system may be three systems instead of two systems, and the same effect can be achieved if there are a plurality of systems. Furthermore, although the case where the direct demodulator is used has been described here, the frequency converter (reception mixer) is configured such that one is a direct demodulator and the other is not a baseband signal output but an IF signal output. The frequency converter (reception mixer) provided with different IF signal outputs may be used. Further, even if the multiplication order is not only the second order but also a higher order such as the third order or the sixth order, the same effect can be obtained. As for the arrangement of the higher-order multipliers, the same arrangement as in FIG. 2 is possible.

Embodiment 4 FIG.
In the first embodiment described above, an example of a high-frequency circuit that constitutes a transmission / reception system that includes a transmission system and a reception system as power supply destinations of local oscillation signals and that includes a multiplier independent of each of the transmission system and the reception system is shown. However, in the fourth embodiment, different modulators or frequency converters are provided as local power supply destinations in the transmission system of the first embodiment, and different modulators or frequency converters are provided with independent multipliers. The example of the high frequency circuit which comprises a transmission / reception system is shown.

  FIG. 5 is a block diagram showing the configuration of the high-frequency circuit according to Embodiment 4 of the present invention. In the fourth embodiment shown in FIG. 5, the same parts as those in the first to third embodiments shown in FIG. 1 to FIG. The high-frequency circuit according to Embodiment 4 shown in FIG. 5 includes two different modulation systems, a QPSK modulation system having a QPSK modulator 51 and an ASK modulation system having an ASK modulator 52, as a transmission system. As shown, a receiving mixer (frequency converter) 16 is provided. A plurality of modulators 51 and 52 and a multiplier 34a, 34b, and 34c, which are independent of the receiving mixer 16, are provided. For this reason, it is necessary to feed three local signals of the QPSK modulator 51, the ASK modulator 52, and the reception mixer 16, and only the local oscillator 31 is common to the plurality of modulators 51 and 52 and the reception mixer 16, and is switched. After selecting either one by the switch 73, amplification, multiplication and amplification are performed, and power is supplied as a local oscillation signal to a desired circuit. 35a to 35c are local oscillator amplifiers in the frequency band of the local oscillator output, 36a to 36c are local oscillator amplifiers in the frequency band twice the local oscillator output, and 71 to 73 are changeover switches.

  Therefore, according to the fourth embodiment, the local oscillation signals of the QPSK modulator 51, the ASK modulator 52, and the reception mixer 16 are output signals obtained by multiplying the oscillation output generated from the common local oscillation source by the same order. Therefore, a common local oscillator 31 can be used, and these losses are suppressed by performing distribution and feeding to the QPSK modulation system, ASK modulation system, and reception system at the same frequency as the local oscillator output. be able to. Also, since the operating frequency of the local amplifier that compensates for these losses may be half the conventional frequency band, the gain is high and the number of amplifier stages can be reduced. Since the multipliers 34a to 34c can be arranged in the vicinity of the QPSK modulator 51, the ASK modulator 52, and the reception mixer 16, it is possible to shorten the feeding distance of the signal in the frequency band twice the local oscillator output. The power supply loss from the multiplier output to each modulator can be reduced. For this reason, by providing a multiplier in each individual transmission system, the number of stages of the local oscillation amplifier can be reduced, and the high-frequency circuit can be miniaturized.

  Here, the description has been made using the changeover switch when the local oscillation signal is supplied to the QPSK modulation system, the ASK modulation system, and the reception system, but the same effect can be obtained by using the power distributor. Further, although the case where QPSK modulation and ASK modulation are used as two different modulation systems has been described, the same effect can be obtained even if a plurality of other modulation schemes are used. The modulation system may be three systems instead of two systems, and the same effect can be obtained if there are a plurality of systems. Furthermore, although the case where the direct modulator is used has been described here, the frequency converter (transmission mixer) is configured such that one is a direct modulator and the other is not a baseband signal input but an IF signal input. The frequency converter (transmission mixer) provided with different IF signal inputs may be used. Further, even if the multiplication order is not only the second order but also a higher order such as the third order or the sixth order, the same effect can be obtained. As for the arrangement of the higher-order multipliers, the same arrangement as in FIG. 2 is possible.

  In the fourth embodiment, the transmission system includes a plurality of different modulators or frequency converters, the reception system includes one frequency converter (reception mixer), and different modulators or frequency converters and frequency converters. Although an example of a transmission / reception system provided with independent multipliers in (reception mixer) is shown, as another example of the transmission / reception system, the reception system includes a plurality of different demodulators or frequency converters, and different demodulators or frequencies A plurality of systems of reception systems each having an independent multiplier in the converter may be used. When the reception system constitutes a plurality of systems of reception systems as described above, the transmission system has one frequency converter (transmission system). A mixer may be provided, and the same effect is achieved.

Embodiment 5 FIG.
FIG. 6 is a block diagram showing a configuration of a high-frequency circuit according to Embodiment 5 of the present invention. In the fifth embodiment shown in FIG. 6, the same parts as those in the first to fourth embodiments shown in FIG. 1 to FIG. In the fifth embodiment, at least the ASK modulator 52 and the multiplier 34 a, the reception mixer (frequency converter) 16 and the multiplier 34 b are integrated on the IC chip 76. Furthermore, on this IC chip 76, power divider 74, transmission lines 77a and 77b, local oscillator amplifiers 35a and 35b in the frequency band of the local oscillator output, and local oscillation in the frequency band twice the local oscillator output. Amplifiers 36a and 36b, transmission amplifier 12, low noise amplifier 15, and changeover switch 71 are integrated.

  The circuit configuration and operation shown in FIG. 6 are substantially the same as those in FIG. 1 except that the local oscillation system, transmission system, and reception system other than the local oscillator 31 are integrated on one IC chip 76. When a transmission / reception system is configured on an IC, the transmission system and the reception system are often arranged at both ends of the IC chip 76 as shown in the figure for reasons such as securing transmission / reception isolation and securing a GND terminal. In such a case, since the distance between the transmission system and the reception system is long, the length of the transmission line for feeding the local signal becomes long. In the case where the transmission / reception circuit is integrated on one chip, SiIC may be used. In this case, since the Si substrate is a resistor, the transmission line loss on the IC chip is large, and the power supply loss of the local signal is also large. There is a problem of becoming.

  In such an IC configuration, the multipliers are individually arranged in the vicinity of the transmission system modulator or frequency converter (transmission mixer), the reception system demodulator or frequency converter (reception mixer). Thus, it is possible to shorten the feeding distance of the signal in the frequency band twice the local oscillator output, and to reduce the feeding loss from the multiplier output to each modulator. For this reason, by providing the multiplier in each of the transmission system and the reception system, the number of stages of the local oscillation amplifier can be reduced, and the high-frequency circuit can be miniaturized.

  Here, the power distributor 74 is used to feed the local signal to the transmission system and the reception system. However, when transmission / reception is performed in a time division manner, the same effect can be obtained by using a high frequency switch. Play. In addition, here, the configuration in which the local oscillation signal is supplied to the two systems of the transmission system and the reception system has been described, but the same effect can be obtained even in the configuration in which the local transmission signal is supplied to a plurality of transmission systems or a plurality of reception systems. Play. Furthermore, although the case where a direct modulator is used in the transmission system has been described here, a configuration in which a frequency converter (transmission mixer) is used may be used, and the reception system is not a reception mixer but a demodulator. It is good. Even if the multiplication order is not only the second order but also a higher order such as the third or sixth order, the same effect can be obtained. As for the arrangement of the higher-order multipliers, the same arrangement as in FIG. 2 is possible. Further, the same effect can be obtained even if the receiving system is a plurality of systems.

It is a block diagram which shows the structure of the high frequency circuit which concerns on Embodiment 1 of this invention. FIG. 3 is a block diagram illustrating a configuration of a high-frequency circuit according to Embodiment 1 of the present invention, which is an example when the multiplication order is six. It is a block diagram which shows the structure of the high frequency circuit which concerns on Embodiment 2 of this invention. It is a block diagram which shows the structure of the high frequency circuit which concerns on Embodiment 3 of this invention. It is a block diagram which shows the structure of the high frequency circuit which concerns on Embodiment 4 of this invention. It is a block diagram which shows the structure of the high frequency circuit which concerns on Embodiment 5 of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Transmission IF signal terminal, 2 Reception IF signal terminal, 11 Transmission mixer (frequency converter), 12 Transmission amplifier, 15 Low noise amplifier, 16 Reception mixer (frequency converter), 21 Circulator, 26 Transmission / reception antenna, 27 Transmission antenna, 28 receiving antennas, 31 local oscillators, 32 multipliers, 33 power dividers, 34a to 34c multipliers, 35a to 35c local oscillator amplifiers in frequency bands of local oscillator outputs, 36a to 36f double frequency bands of local oscillator outputs Local amplifier, 37 triple multiplier, 51 QPSK modulator, 52 ASK modulator, 53 ASK demodulator, 54 QPSK demodulator, 60 transmission I channel baseband signal terminal, 61 transmission Q channel baseband signal terminal, 62 transmission ASK Baseband signal terminal, 63 receiving ASK baseband signal terminal, 4 received I-channel baseband signal terminals 65 receive Q channel baseband signal terminals, 70 changeover switch 71 changeover switch 72 changeover switch 73 changeover switch, 76 IC chip, 77a, 77b transmission line.

Claims (5)

  In a transmitter / receiver that makes each local signal of the transmission system and reception system an output signal obtained by multiplying the oscillation output generated by a common local power source by the same order, independent multiplier for local transmission and reception A high-frequency circuit comprising:   In a transmitter having a plurality of different modulators or frequency converters and having each local oscillation signal as a multiplication output signal of the same order of a common oscillation source, an independent multiplier is used for each modulator or frequency converter. A high-frequency circuit characterized by comprising.   A receiver having a plurality of different demodulators or frequency converters and having the local oscillation signal as a multiple output signal of the same order of a common oscillation source, with independent multipliers for each demodulator or frequency converter A high frequency circuit characterized by that.   4. The high-frequency circuit according to claim 1, wherein the transmission system or the reception system is configured as described in claim 2 or claim 3.   5. A high frequency circuit comprising at least a multiplier and a frequency converter, modulator, or demodulator integrated on a one-chip IC.

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