JPH09191264A - Transmitter-receiver, receiver, communication system and reception section evaluation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To decrease number of filters, to prevent a spectrum from being deteriorated and to eliminate the need for shield by using a reception orthogonal mixer to mix a received radio wave with a carrier and applying frequency conversion to a received wave into a base band signal directly. SOLUTION: A PLL 115a synchronously with a reference oscillator 14a gives a carrier to a reception orthogonal mixer 12a and a local oscillation wave to a mixer 5d. Furthermore, an output of a PLL 215b synchronously with a reference oscillator 14b gives an output of the PLL 215b to the mixer 5d, a BPF 4f filters the mixed frequencies and gives the result to a transmission orthogonal mixer 12b as a carrier. In the case of transmission, the carrier is sent via a BPF 4a and an HPA 13. In the case of reception, a received radio wave is mixed with the carrier by the reception orthogonal mixer 12a via a LNA 3 and a BPF 4a to apply frequency conversion to the reception wave directly into a base band signal and a digital arithmetic circuit 9 is used to decode the result into original information. Thus, number of filters is reduced and no spectrum is deteriorated even when a transmission radio wave is leaked and shield is avoided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission / reception device, a reception device, a communication system, an evaluation device for a reception unit, etc. used in a wireless communication system.

[0002]

2. Description of the Related Art FIG. 25 shows an example of the configuration of a conventional digital portable telephone shown in FIG. A-2 on page 78 of Nikkei Electronics September 12, 1994 issue. In the figure, 1 is an antenna, 2 is a duplexer, 3 is a low noise amplifier (LNA), 4 is a band pass filter (BPF), 5 is a mixer (MIX), 6 is an amplifier (AMP), and 7 is AD conversion. , 8 is a digital filter, 9 is a digital operation circuit, 10 is a DA conversion circuit, 11 is a low-pass filter (L
PF), 12 is a quadrature mixer, 13 is a high power amplifier (HP
A). Further, 14 is a PLL circuit, and 15 is a reference oscillator. Further, 16 is LNA3, BPF4a, MI
X5a, BPF4b, AMP6a, MIX5b, BPF
4c, the AMP 6b, the AD converter 7, the digital filter 8a, and the digital arithmetic circuit 9
Digital arithmetic circuit 9, digital filter 8b, DA
Converter 10, LPF 11, quadrature mixer 12, BPF 4
d, the mixer 5c, the BPF 4e, and the HPA 13 are transmission units.

First, the operation of the receiving section will be described. The received wave received by the antenna 1 is transmitted / received by the duplexer 2
And then amplified by LNA3. The reception wave amplified by the LNA 3 is input to the mixer 5a via the BPF 4a that suppresses unnecessary waves outside the reception band. Here, the PLL circuit 15a
It is mixed with the local oscillation wave output from and is converted into an intermediate frequency signal. The intermediate frequency signal output from the mixer 5a is band-limited by the BPF 4b and amplified by the AMP 6a. Further, the mixer 5b converts the signal to a lower intermediate frequency signal, and the BPF 4c limits the band to the desired reception channel. The signal of the desired reception channel selected by the BPF 4c is amplified by the AMP 6b, converted into a digital signal by the AD converter 7, and then input to the digital filter 8a. Here, the waveform is shaped and demodulated by the next digital arithmetic circuit 9.

The operation of the BPF forming the receiving section will be described. FIG. 26 shows the relationship between the reception channel and the band passing through each BPF. BW21 and BW
22 is a frequency band that is converted to the same intermediate frequency by the mixer 5a and passes through the BPF 4b. Therefore, if a signal exists in the BW 21, it may be converted into the same intermediate frequency as the desired signal in the BW 22.
Therefore, by providing the BPF 4a and limiting the received wave input to the mixer 5a within the band of BW1, the output frequency band is limited to BW22. Also, BPF4c
Passes only the desired channel in the reception band of the BW 22 converted to the intermediate frequency.

Next, the operation of the transmitter will be described. The baseband signal represented by the rectangular coordinates of I and Q generated by the digital arithmetic circuit 9 shown in FIG. 25 is waveform-shaped by the digital filter 8b and converted into an analog signal by the DA converter 10. The clock component included in the output of the DA converter 10 is suppressed by the LPF 11, and the quadrature mixer 12
And performs vector modulation on the carrier of the intermediate frequency generated by the PLL circuit 15b. The BPF 4d suppresses harmonics of the modulation signal generated by the quadrature mixer. Mixer 5c
The modulated wave input to is mixed with the local oscillation wave output from the PLL circuit 15a and becomes a high frequency signal. Next BPF
In 4e, the image signal generated in the mixer 5c is removed, amplified by the HPA 13, and then passed through the demultiplexer 2 to
Radiated from the antenna 1.

Further, in the case of a mobile phone, as shown in FIG. 26, the radio waves of a plurality of channels are arranged at equal intervals within a certain band. This interval should be as narrow as possible in order to effectively use the radio waves, but if the frequency of the emitted radio waves fluctuates, it will interfere with the signals of adjacent channels. Especially, since the mobile terminal has a large vibration, the stability of the oscillation circuit that determines the frequency of the emitted radio wave is important.
Furthermore, it is necessary to output multiple frequencies in order to transmit and receive the frequencies of all channels in the band. It is also required to be small. For these reasons, as the oscillation circuit, a PLL circuit that is small and lightweight and can stably output a plurality of frequencies even in the microwave band is used. FIG. 27 shows a configuration example of the PLL circuit. In the figure, 101 is a reference signal input terminal, 102 is a phase comparator, 103 is a frequency divider, and 104 is a voltage controlled oscillator (VC).
O) and 105 are output signal terminals. The phase comparator outputs a voltage according to the frequency difference between the two input signals. Further, the frequency divider outputs a signal having a frequency that is a fraction of an integer of the input signal, and the VCO is an oscillator that can change the frequency of the output signal according to the input voltage. A part of the high frequency signal output from the VCO and directed to the output signal terminal 105 is input to the frequency divider, is frequency-divided here, and is input to the phase comparator. The phase comparator compares the reference signal input from the reference signal input terminal with the output of the frequency divider, and generates a voltage according to the difference between the frequencies of the reference signal and the frequency divider. The VCO changes the oscillation frequency according to the voltage output from the phase comparator. If the frequency of the output signal of the frequency divider and the frequency of the reference signal match, the voltage output from the phase comparator also becomes constant, and the frequency of the signal output from the VCO also becomes constant.

[0007]

A large number of BPFs are used in a transmitting / receiving device represented by a conventional digital mobile phone. A dielectric material, a ceramic, a crystal, a SAW element, or the like is used for the BPF that filters a high-frequency signal. Since the frequency characteristics of these filters are all determined by their physical shape, miniaturization is difficult. For example, FIG. 2 of Nikkei Electronics September 12, 1994 page 85 shows the size of a ceramic filter on a printed circuit board of a mobile phone. The size of the SAW filter on the printed circuit board is shown in FIG. 4 on page 87. Each of them has the same size as an IC that constitutes a semiconductor circuit. Since it is difficult to miniaturize filters as compared with semiconductor circuits that are becoming more integrated, the volume ratio of these filters is increasing more and more, and there is a problem in that the size of a mobile phone cannot be reduced to a certain size or less.

In order to reduce the number of such filters, a direct modulation system for modulating a high frequency carrier wave as shown in FIG. 28 has been proposed. Since the modulated wave output from the quadrature mixer 12 is radiated from the antenna without frequency conversion, it is not necessary to provide a mixer for frequency conversion and a BPF for suppressing an image signal generated in the mixer. However, in the case of the direct modulation method, since the carrier wave generated in the PLL circuit 15a and the modulated wave output from the quadrature mixer 12 have the same frequency, the modulated wave leaks to the PLL circuit 15a and the carrier wave output from the PLL circuit 15a. May deteriorate the spectrum of. FIG. 29 shows the input spectrum of the phase comparator when the modulated wave is input to the input terminal of the frequency divider. In the phase comparator, the value of the output voltage changes according to the frequency difference between the reference signal and the output of the frequency divider, so the output voltage does not become constant when an input signal with a certain bandwidth is input. It changes constantly. Therefore, even in a VCO in which the oscillation frequency is controlled by the output voltage of the phase comparator, the frequency of the output signal is not constant,
The spectrum is degraded. If such a signal is used as a carrier wave for modulation by the quadrature mixer, the output spectrum naturally deteriorates. In the transmitter of the mobile phone shown in FIG. 28, the power of the modulated wave output from the HPA 13 is 30d.
Since it is as large as Bm or more, such a phenomenon easily occurs,
The spectrum of the modulated wave is significantly deteriorated. In order to prevent this, the PLL circuit 15a needs to be shielded severely, which causes a problem of increasing the product cost.

Further, as shown in FIG. 30, the PLL circuit 1
In order to suppress the interference of the output of the HPA 13 with respect to 5a, two P's are used as the carrier source of the quadrature mixer 12 of the transmitter.
A configuration has been proposed in which the output signals of the LL circuits 15a and 15c are mixed by the mixer 5d and the output is used. Since the frequency of the carrier wave generated in the PLL circuits 15a and 15b and the frequency of the transmitted wave are different, a part of the output of the HPA leaks to the PLL circuit and deteriorates the spectrum of the modulated wave even if input to the quadrature mixer for transmission. There is nothing to do. However, the PLL
Since the number of circuits increases, the increase in product cost due to the increase in the number of parts becomes a problem. Further, the number of filters in the receiving unit is still large, and there is a problem that there is a limit to downsizing and cost reduction of the transmitting / receiving device.

[0010]

According to a first aspect of the present invention, there is provided a transmission / reception apparatus which outputs one or two reference oscillators and signals of different frequencies synchronized with the outputs of the reference oscillators. No. 2 PLL oscillating circuit, a mixer for frequency mixing the output of the first PLL oscillating circuit and the output of the second PLL oscillating circuit, and either the sum or difference frequency wave output by the mixer is selected. A frequency converter having a band-pass filter, a transmitter having a quadrature mixer including two unit mixers for vector-modulating the output wave of the frequency converter as a carrier wave by a baseband signal, and a receiving unit; Wave and an output wave of the first PLL oscillation circuit as a carrier wave, and a receiver having a quadrature mixer including two unit mixers for outputting a baseband signal. Those were.

According to a second aspect of the present invention, there is provided a transmitting / receiving apparatus, a reference oscillator, a PLL oscillation circuit which outputs a signal of a frequency different from the output of the reference oscillator in synchronization with the output of the reference oscillator, and the output of the reference oscillator. And a frequency converter having a mixer for frequency-mixing the output of the PLL oscillation circuit and a bandpass filter for selecting either the sum or difference frequency wave output by the mixer, and the frequency conversion by the baseband signal. Transmitter having a quadrature mixer including two unit mixers for vector-modulating the output wave of the device as a carrier wave to generate a transmitted wave, and a received wave and an output wave of either the reference oscillator or the PLL oscillation circuit as a carrier wave. And a receiver having a quadrature mixer including two unit mixers for inputting and outputting a baseband signal.

The transmitting / receiving apparatus according to the invention of claim 3 is 1
Or two reference oscillators, and a first for outputting signals of different frequencies synchronized with the output of the reference oscillator,
A second PLL oscillation circuit, a mixer for frequency mixing the output of the first PLL oscillation circuit and the output of the second PLL oscillation circuit, and a wave of sum and difference frequencies connected to the mixer and output by the mixer. A frequency converter having a demultiplexing circuit that outputs respectively from different first and second terminals,
A transmitter having a quadrature mixer including two unit mixers that vector-modulates one output wave of the demultiplexer circuit as a carrier wave by a baseband signal, and a received wave and the other of the demultiplexer circuits. Input the output wave as a carrier wave,
And a receiver having a quadrature mixer including two unit mixers for outputting a baseband signal.

According to a fourth aspect of the present invention, there is provided a transmitting / receiving apparatus, a reference oscillator, a PLL oscillation circuit which outputs a signal of a frequency different from the output of the reference oscillator in synchronization with the output of the reference oscillator, and the output of the reference oscillator. And a frequency that has a mixer for frequency-mixing the output of the PLL oscillation circuit and a demultiplexer circuit that is connected to the mixer and that outputs waves of sum and difference frequencies output by the mixer from different first and second terminals, respectively. A converter, a transmitter having a quadrature mixer including two unit mixers for vector-modulating one output wave of the demultiplexing circuit as a carrier wave by a baseband signal, a received wave and the demultiplexed wave. And a receiver having a quadrature mixer including two unit mixers for inputting the other output wave of the circuit as a carrier and outputting a baseband signal.

The transmitting / receiving device according to the invention of claim 5 is
Or two reference oscillators, and a first for outputting signals of different frequencies synchronized with the output of the reference oscillator,
A second PLL oscillation circuit, a mixer for frequency mixing the output of the first PLL oscillation circuit and the output of the second PLL oscillation circuit, and either the sum or difference frequency wave output by the mixer. A frequency converter having a bandpass filter to be selected, switching means connected to the frequency converter and changing a supply destination of the output of the frequency converter,
A transmission section having a quadrature mixer including two unit mixers for vector-modulating the output wave of the frequency converter supplied from the switching means by the base band signal as a carrier wave to generate a transmission wave, the reception wave and the switching means. Input the output wave of the frequency converter supplied from
And a receiver having a quadrature mixer including two unit mixers for outputting a baseband signal.

According to a sixth aspect of the present invention, there is provided a transmitting / receiving device, a reference oscillator, a PLL oscillation circuit which outputs a signal of a frequency different from the output of the reference oscillator in synchronization with the output of the reference oscillator, and the output of the reference oscillator. And a frequency converter having a mixer for frequency mixing the output of the PLL oscillation circuit and a band-pass filter connected to the mixer for selecting either a sum or difference frequency wave output by the mixer. Switching means for changing the supply destination of the output of the frequency converter, and vector-modulating the output wave of the frequency converter supplied from the switching means by the base band signal as a carrier wave to generate a transmission wave. A transmitter having an orthogonal mixer including two unit mixers, a received wave, and an output wave of the frequency converter supplied from the switching means. Type as transmitting, base - a receiving portion having a quadrature mixer comprising two unit mixers for outputting a baseband signal, those having a.

The transmitting / receiving device according to the invention of claim 7 is
Or two reference oscillators, and a first for outputting signals of different frequencies synchronized with the output of the reference oscillator,
A second PLL oscillation circuit, a mixer for frequency mixing the output of the first PLL oscillation circuit and the output of the second PLL oscillation circuit, and either the sum or difference frequency wave output by the mixer is selected. A frequency converter having a band pass filter, a quadrature mixer including two unit mixers connected to the frequency converter, into which the output wave of the frequency converter is input as a carrier, and a high frequency signal input of the quadrature mixer. A band-pass filter, one end of which is connected to the output terminal and which passes a reception wave input to the quadrature mixer and a transmission wave generated from the quadrature mixer, and a first switch connected to the other end of the band-pass filter. Means and a second switching means connected to the base band signal input / output terminal of the quadrature mixer, the first switching means and the second switching means. By means of the means, the connection destination of the quadrature mixer and the bandpass filter is switched to the transmission section or the reception section, and the quadrature mixer vector-modulates the carrier wave by the baseband signal input from the transmission section to generate a transmission wave. Alternatively, a baseband signal is generated by the received wave input and the carrier wave and is output to the receiving unit.

The transmitting / receiving apparatus according to the invention of claim 8 is 1
Or two reference oscillators, and a first for outputting signals of different frequencies synchronized with the output of the reference oscillator,
A second PLL oscillation circuit, a mixer for frequency mixing the output of the first PLL oscillation circuit and the output of the second PLL oscillation circuit, and either the sum or difference frequency wave output by the mixer is selected. A frequency converter having a band pass filter, switching means connected to the frequency converter for changing a supply destination of the output of the frequency converter, and a frequency converter supplied from the switching means by a base band signal. Vector-modulates the output wave of
A transmitter having a first quadrature mixer including two unit mixers for generating a transmission wave, a reception wave and an output wave of the frequency converter supplied from the switching means are input as carriers and a baseband signal is output. Receiver having a second quadrature mixer including two unit mixers, first switching means connected to the baseband signal input terminal of the first quadrature mixer of the transmitter, and first receiver of the receiver. Second switching means connected to the baseband signal output terminal of the two quadrature mixers, and a waveform for shaping the waveform of the baseband signal connected between the first switching means and the second switching means. A shaping filter, which is connected and arranged so that the connection destination of the waveform shaping filter is switched to the transmitting unit or the receiving unit by the first switching unit and the second switching unit. .

The transmitting / receiving apparatus according to the invention of claim 9 is
Or two reference oscillators, and a first for outputting signals of different frequencies synchronized with the output of the reference oscillator,
A second PLL oscillation circuit, a mixer for frequency mixing the output of the first PLL oscillation circuit and the output of the second PLL oscillation circuit, and either the sum or difference frequency wave output by the mixer is selected. A frequency converter having a band pass filter, a quadrature mixer including two unit mixers connected to the frequency converter, into which the output wave of the frequency converter is input as a carrier, and a high frequency signal input of the quadrature mixer. First switching means having one end connected to the output terminal side, second switching means having one end connected to the baseband signal input / output terminal of the quadrature mixer, and the other end of the second switching means. Third connected by switching
The switching means and the fourth switching means, and the waveform shaping filter, which is connected between the third switching means and the fourth switching means, for shaping the waveform of the baseband signal. The fourth switching means is connected and arranged so as to switch the connection destination of the quadrature mixer and the waveform shaping filter to the transmission section or the reception section.

The transmitting / receiving device according to the invention of claim 10 is
The transmitter / receiver according to claim 7, 8 or 9, wherein one or two reference oscillators are provided, and first and second outputs of signals of different frequencies synchronized with the outputs of the reference oscillators.
PLL oscillation circuit, a mixer for frequency mixing the output of the first PLL oscillation circuit and the output of the second PLL oscillation circuit, and a band pass for selecting either the sum or difference frequency wave output by the mixer. Instead of a frequency converter having a filter, a reference oscillator, a PLL oscillation circuit that outputs a signal of a frequency different from the output of the reference oscillator in synchronization with the output of the reference oscillator, the output of the reference oscillator, and the A frequency converter having a mixer for frequency mixing the output of the PLL oscillation circuit and a bandpass filter connected to the mixer for selecting either a sum or difference frequency wave output by the mixer Is.

The transmitting / receiving device according to the invention of claim 11 is
The baseband signal amplifying means of the receiving section for amplifying the baseband signal from the quadrature mixer including the two unit mixers which receives the received wave and the carrier wave and outputs the baseband signal is composed of individual transistors at the first stage. It is characterized in that it is a low-noise amplifier formed and a base-band signal amplifier circuit composed of a plurality of base-band signal amplifiers which are monolithically integrated base-band signal amplifiers in the subsequent stage.

According to a twelfth aspect of the present invention, there is provided a receiving apparatus, which receives a received wave and a carrier wave and which receives a received wave and a carrier wave. The base section of the receiving section amplifies the base band signal from the quadrature mixer including two unit mixers. -The means for amplifying the band signal are
The first stage is a low noise amplifier formed by individual transistors and the like, and the second stage is a baseband signal amplifier circuit composed of a plurality of baseband signal amplifiers which are monolithically integrated baseband signal amplifiers. To do.

A communication system according to a thirteenth aspect of the present invention applies the transmitting / receiving apparatus according to any one of the first to eleventh aspects or the receiving apparatus according to the twelfth aspect and uses a code division multiple access system. Is.

According to a fourteenth aspect of the present invention, there is provided a receiver evaluation apparatus, which comprises a pseudo signal source connected to an input end of a measured receiver.
In a receiver evaluation device including an output signal measuring device connected to an output end of a receiver under test, a band pass filter and a band elimination having a stop band in a pass band of the band pass filter as the pseudo signal source. It uses a white noise source whose band is limited by a filter.

[0024]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1 FIG. 1 is a block diagram of a transmission / reception apparatus showing Embodiment 1 of the present invention. In the figure, 12a is a quadrature mixer for reception, 12b is a quadrature mixer for transmission, and 15a and 15b are first and second PLL circuits 5d having output frequencies f1 and f2, respectively.
Is a mixer, and 4f is a BPF whose pass band is frequency | f1 + f2 |.

Next, the operation will be described. The first and second PLL circuits 15a and 15b respectively include a reference oscillator 14
It is synchronized with the outputs of a and 14b. First PLL circuit 1
The output f1 of 5a is input to the quadrature mixer for reception 12a as a carrier wave and is also input to the mixer 5d as a local oscillation wave. Further, the output f2 of the second PLL circuit 15b is input to the mixer 5d, where it is mixed with the output f1 of the first PLL circuit 15a. The output of the mixer 5d is frequency | mf
A signal of 1 ± nf2 | (m and n are integers) appears. Among them, only the signal of frequency | f1 + f2 | is filtered by the BPF 4f and input to the quadrature mixer 12b for transmission as a carrier.

At the time of transmission, a carrier wave having a frequency of | f1 + f2 | is vector-modulated by the transmission quadrature mixer 12b to obtain a transmission wave. This is filtered with BPF4e, H
It is amplified by the PA 13 and radiated from the antenna 1. Further, at the time of reception, the reception wave received by the antenna 1 is input to the reception quadrature mixer 12a via the transmission / reception duplexer (DUP) 2, LNA3, and BPF4a, where it is mixed with the carrier wave of the frequency f1 and the reception wave is extracted. Direct frequency conversion to a baseband signal. At the output of the quadrature mixer for reception 12a, in addition to the desired signal, the received signal adjacent thereto appears after being converted into a baseband signal, and is filtered by the LPF 11a. Further A
After being amplified by MP6 and converted into a digital signal by the AD converter 7, the waveform is shaped by the digital filter 8a, and the original information is restored by the digital operation circuit 9 in the subsequent stage.

Since the baseband signal is directly converted from the high frequency signal even at the time of reception, the mixers 5a and 5b in the conventional transmitter / receiver as shown in FIG. 25 and the former stage of the mixer 5b for removing the image frequency. To be installed in
4b and the BPF 4c provided in the latter stage of the mixer 5b for removing the local oscillation wave are unnecessary. Therefore, it greatly contributes to downsizing of the device. Since the carrier wave added to the transmission quadrature mixer 12b is the sum frequency signal of the output signals of the two PLL circuits 15a and 15b, the frequency of the transmission wave and P
The LL circuits 15a and 15b have different oscillation frequencies. Therefore, even if part of the output of the HPA 13 leaks and interferes, the spectrum of the modulated wave is not deteriorated.

In the present embodiment, the frequency of the carrier wave added to the transmission quadrature mixer 12b is the sum frequency of the output signals f1 and f2 of the first and second PLL circuits 15a and 15b. Not limited to, for example, | f1-
Other frequencies such as f2 | In this case, BPF4
The center frequency of the pass band of f is | f1-f2 |.

Further, in this embodiment, the first and second PLs are
The reference oscillators 14a and 14b of the L circuits 15a and 15b have been described separately. However, the present invention is not limited to this, and the same reference oscillator 14 may be used as shown in FIG. 2, and the same effect is obtained.

Second Embodiment FIG. 3 is a block diagram of a transmitting / receiving apparatus showing a second embodiment of the present invention. In the figure, the mixer 5d includes an output f1 of the PLL circuit 15 whose reference source is the reference oscillator 14a and a reference oscillator 1
The output f2 of 4b is input. The output f1 of the PLL circuit 15 is added to the reception quadrature mixer 12a, and the carrier of the frequency | f1 + f2 | obtained by filtering the output of the mixer 5d with the BPF 4f is added to the transmission quadrature mixer 12b. Even with such a configuration, the same effect as that of the first embodiment can be obtained.

In this embodiment, the frequency of the carrier wave added to the transmission quadrature mixer 12b is the sum frequency of the output f1 of the PLL circuit 15 and the output f2 of the reference oscillator 14b. However, the present invention is not limited to this, and for example,
Other frequencies such as f1-f2 | may be used. In this case, B
The center frequency of the pass band of PF4f is | f1-f2 |.

Further, in this embodiment, the reference oscillator 14b of the PLL circuit 15 is provided separately from the reference oscillator 14a. However, the present invention is not limited to this, and the same reference oscillator 14 may be used as shown in FIG. 4, and the same effect is obtained.

Embodiment 3 FIG. 5 is a block diagram of a transmission / reception apparatus showing Embodiment 3 of the present invention. In the figure, 18 is a demultiplexing circuit. The frequency f1 output from the first and second PLL circuits 15a and 15b,
The signal of f2 is input to the mixer 5d, mixed, and the frequency | m
A signal of f1 ± nf2 | (m and n are integers) is obtained, and this signal is input to the demultiplexing circuit 18. Since the demultiplexing circuit 18 has an input terminal, first and second output terminals, and has a pass characteristic as shown in FIG. 6, a signal of frequency | f1 + f2 | is output to the first output terminal of | f1-f2 | Is output from the second output terminal. A signal of frequency | f1 + f2 | is input to the quadrature mixer for reception, and a signal of | f1-f2 | is input to the quadrature mixer for transmission as carrier waves.

Since the baseband signal is directly converted from the high frequency signal even at the time of reception, the mixers 5a and 5b in the conventional transmitting and receiving apparatus as shown in FIG. 25 and the preceding stage of the mixer 5b for removing the image frequency. To be installed in
4b and the BPF 4c provided in the latter stage of the mixer 5b for removing the local oscillation wave are unnecessary. Therefore, it greatly contributes to downsizing of the device. Since the carrier wave to be added to the transmission quadrature mixer 12b is the signal of the difference frequency between the output signals of the two PLL circuits 15a and 15b, the frequency of the transmission wave and P
The LL circuits 15a and 15b have different oscillation frequencies. Therefore, even if part of the output of the HPA 13 leaks and interferes, the spectrum of the modulated wave is not deteriorated.

In this embodiment, the frequency of the carrier wave added to the reception quadrature mixer 12a is set to the first and second PLLs.
With the sum frequency of the output signals f1 and f2 of the circuits 15a and 15b, the carrier waves added to the transmission quadrature mixer 12b are f1 and f.
A difference frequency of 2 was used. However, the present invention is not limited to this, and the carrier wave to be added to the quadrature mixer 12a of the receiving unit is the output signal f1 of the first and second PLL circuits 15a and 15b.
Similar effects are obtained even if the difference frequency of f2 is used and the carrier wave added to the quadrature mixer 12b of the transmission unit is the sum frequency of f1 and f2.

In this embodiment, the first and second PLs are
The reference oscillators 14a and 14b of the L circuits 15a and 15b have been described separately. However, the present invention is not limited to this, and the same reference oscillator 14 may be used as shown in FIG. 7, and the same effect is obtained.

Fourth Embodiment FIG. 8 is a block diagram of a transmission / reception apparatus showing a fourth embodiment of the present invention. In the figure, the mixer 5d includes an output f1 of the PLL circuit 15 whose reference source is the reference oscillator 14a and a reference oscillator 1
The output f2 of 4b is input. The signal of the frequency | mf1 ± nf2 | (m and n are integers) appearing at the output of the mixer 5d is demultiplexed by the demultiplexing circuit 18, and the signal of the frequency | f1 + f2 | is fed to the quadrature mixer for reception 12a and the frequency | f1-f2. The signals | are input to the transmission quadrature mixer 12b as carrier waves. Even with such a configuration, the same effect as that of the third embodiment can be obtained.

In this embodiment, the frequency of the carrier wave added to the receiving quadrature mixer 12a is the sum frequency of the output f1 of the PLL circuit 15 and the output f2 of the reference oscillator 14b, and the carrier wave added to the transmitting quadrature mixer 12b is f1, The frequency difference was f2. However, the present invention is not limited to this, and the carrier wave to be added to the quadrature mixer 12a of the receiving unit is PLL
The frequency difference between the output f1 of the circuit 15 and the output f2 of the reference oscillator 14b may be used, and the carrier wave added to the quadrature mixer 12b of the transmitter may be the sum frequency of f1 and f2.

Further, in this embodiment, the PLL circuit 15a is used.
The reference oscillator 14b is provided separately from the reference oscillator 14a described above. However, the present invention is not limited to this, and the same reference oscillator 14 may be used as shown in FIG. 9, and the same effect is obtained.

Fifth Embodiment FIG. 10 is a block diagram of a transmitter / receiver in a system using a time division multiple access system using the same frequency at the time of transmission and at the time of reception, showing a fifth embodiment of the present invention. . In the figure, 19
Is a switch for switching signal paths. 1st, 2nd
Of the frequencies f1 and f output by the PLL circuits 15a and 15b
The signal of No. 2 is input to the mixer 5d, mixed, and the frequency | mf
A signal of 1 ± nf2 | (m and n are integers) is obtained. Of these signals, only the signal of frequency | f1 + f2 | is filtered by the BPF 4f and input to the switch 19. With this transceiver,
Transmission and reception are alternately repeated. The switch 19 connects the output of the BPF 4f to the quadrature mixer for reception 12a during reception and to the quadrature mixer for transmission 12b during transmission in synchronization with this.

Similar to the first embodiment, since the high frequency signal and the base band signal are directly converted both during transmission and during reception, the mixers 5a and 5b in the conventional transmitter / receiver as shown in FIG. , The BPF 4b provided in the front stage of the mixer 5b for removing the image frequency and the BPF 4c provided in the rear stage of the mixer 5b for removing the local oscillating wave are unnecessary, which greatly contributes to downsizing of the device. Further, since the sum frequency of the output signals of the two PLL circuits 15a and 15b is used, the frequency of the transmission wave and P
The LL circuits 15a and 15b have different oscillation frequencies. Therefore, even if part of the output of the HPA 13 leaks and interferes, the spectrum of the modulated wave is not deteriorated.

In this embodiment, the frequency of the carrier wave added to the quadrature mixer 12b of the transmitter is set to the first and second PL.
Although the sum frequency of the output signals f1 and f2 of the L circuits 15a and 15b is used, the present invention is not limited to this, and for example, | f
Other frequencies such as 1-f2 | may be used. In this case, BP
The center frequency of the pass band of F4f is | f1-f2 |.

Further, in this embodiment, the first and second P
The reference oscillators 14a and 14b of the LL circuits 15a and 15b were separately prepared. However, the present invention is not limited to this, and as shown in FIG.
4 may be used, and the same effect is obtained.

Sixth Embodiment FIG. 12 is a block diagram of a transmitter / receiver in a system using a time division multiple access system using the same frequency at the time of transmission and at the time of reception, showing a sixth embodiment of the present invention. . The frequency f1 output by the PLL circuit 15 using the reference oscillator 14a as a reference source and the frequency f2 output by the reference oscillator 14b are input to the mixer 5d and mixed to produce a frequency | mf1 ± nf2 |
(M and n are integers) signals are obtained. Of these signals, only the signal of frequency | f1 + f2 | is filtered by the BPF 4f and input to the switch 19. In this transmission / reception device, transmission and reception are alternately repeated. The switch 19 synchronizes with this and B
When receiving the output of the PF4f, the quadrature mixer for reception 12a
At the time of transmission, it is connected to the transmission quadrature mixer 12b. Even with such a configuration, the same effect as that of the fifth embodiment can be obtained.

In this embodiment, the frequency of the carrier wave added to the quadrature mixer 12b of the transmitter is the sum frequency of the output f1 of the PLL circuit 15 and the output f2 of the reference oscillator 14b. However, the present invention is not limited to this, and for example,
Other frequencies such as f1-f2 | may be used. In this case, B
The center frequency of the pass band of PF4f is | f1-f2 |.

Further, in this embodiment, the PLL circuit 15a is used.
The reference oscillator 14b is provided separately from the reference oscillator 14a described above. However, the present invention is not limited to this, and the same reference oscillator 14 may be used as shown in FIG. 13, and the same effect is obtained.

Embodiment 7 FIG. 14 is a block diagram of a transmitter / receiver in a system using a time division multiple access system using the same frequency at the time of transmission and at the time of reception, showing Embodiment 7 of the present invention. . In the figure, 19
Reference numerals a, 19b and 19c are switches for switching signal paths in synchronization with switching between transmission and reception, and 4g is a filter B for filtering high frequency signals.
PF and 12 are orthogonal mixers.

FIG. 15 shows the structure of the orthogonal mixer 12 shown in FIG. In the figure, 20 and 21 are I channels,
A unit mixer for the Q channel, 22 is a 90-degree phase shifter.
The unit mixers 20 and 21 for the I channel and the Q channel are, for example, like a diode mixer, a baseband signal when a reception wave and a carrier wave are added, and a transmission wave when a baseband signal and a carrier wave are added. Can be output. The carrier wave applied to the carrier wave input terminal is equally distributed, and the 90 ° phase shifter 22 shifts the phase by 90 ° to I, Q.
Input to the unit mixers 20 and 21 of the channel. At the time of transmission, these carrier waves are modulated by the base band signal applied to the base band signal terminal of each channel.
A transmission wave is obtained at the RF terminal by combining these.
Further, during reception, the reception wave applied to the RF terminal is equally distributed as shown by the broken line in FIG. 15, and is input to the unit mixers of the I and Q channels. Here, it is mixed with a carrier wave, and the base band signal of each channel is output to the base band signal terminal of each channel.

As described above, a unit mixer such as a diode mixer which outputs a baseband signal when a reception wave and a carrier wave are added and outputs a transmission wave when the baseband signal and a carrier wave are added. By using it, the same quadrature mixer can be used for both transmission and reception. Therefore, by switching the switches 19a, 19b, 19c, the received wave received by the antenna 1 at the time of reception is LNA3, BPF4g.
After that, the signal is converted into a baseband signal in the quadrature mixer 12. Further, at the time of transmission, the baseband signal is converted into a transmission wave by the quadrature mixer 12, and the BPF 4g and HPA1 are transmitted.
It is radiated from the antenna 1 via 3.

In this way, since the high frequency signal and the base band signal are directly converted during transmission and reception, the mixers 5a and 5b in the conventional transmitter / receiver as shown in FIG. 25 are used.
And the BPF 4b provided in the front stage of the mixer 5b for removing the image frequency and the BPF 4c provided in the rear stage of the mixer 5b for removing the local oscillation wave are unnecessary.
It greatly contributes to downsizing of the device. Further, since the band pass filter 4g for filtering the high frequency signal and the quadrature mixer 12 are used for both transmission and reception, the number of parts can be reduced.

In the present embodiment, the first PLL circuit 15a, the second PLL circuit 15b, the reference oscillator 14a,
The configuration has been described in which the reference oscillator 14b is prepared. But,
The present invention is not limited to this, and this portion may be configured as shown in FIG. 11, FIG. 12 or FIG. 13, and the same effect is obtained.

Eighth Embodiment FIG. 16 is a block diagram of a transmitter / receiver in a system using a time division multiple access system using the same frequency at the time of transmission and at the time of reception, showing an eighth embodiment of the present invention. . In the figure, 23
Is a waveform shaping filter for shaping the waveform of the baseband signal.

By switching the switches 19a, 19b, and 19c, the received wave received by the antenna 1 at the time of reception passes through the switch 19a, the LNA 3, and the BPF 4a, and is transmitted to the quadrature mixer for reception 12a to be the two channels of I and Q. Converted to a band signal. Further switch 19
After passing b, the waveform is shaped by the waveform shaping filter 23,
After passing through the switch 19c, the amplifier 6c, and the AD converter 7, the digital operation circuit 9 demodulates. On the other hand, at the time of transmission, the baseband signals of the two channels I and Q generated by the digital arithmetic circuit 9 are DA converter 10 and LPF1.
1. After passing through the switch 19b, the waveform shaping filter 23 undergoes waveform shaping, and after passing through the switch 19c, the quadrature mixer 1
Enter in 2b. Here, the transmission wave is modulated and HPA13
After being amplified by, it is radiated from the antenna 1.

In this way, since the high frequency signal and the base band signal are directly converted both at the time of transmission and at the time of reception, the mixers 5a and 5b and the image frequency in the conventional transmitter / receiver as shown in FIG. The BPF 4b provided in the front stage of the mixer 5b for removing the BPF 4c and the BPF 4c provided in the rear stage of the mixer 5b for removing the local oscillation wave are unnecessary, which greatly contributes to downsizing of the device. Furthermore, since the waveform shaping filter 23 is shared during transmission and reception, the number of parts can be reduced.

Further, in the present embodiment, the first PLL circuit 15a, the second PLL circuit 15b, the reference oscillator 14a,
The configuration has been described in which the reference oscillator 14b is prepared. But,
The present invention is not limited to this, and this portion may be configured as shown in FIG. 11, FIG. 12 or FIG. 13, and the same effect is obtained.

Ninth Embodiment FIG. 17 is a block diagram of a transmitter / receiver in a system using a time division multiple access system using the same frequency at the time of transmission and at the time of reception, showing a ninth embodiment of the present invention. . In the figure, 12
Uses, for example, a dio-mixer as a unit mixer,
A quadrature mixer 23 that can be used for both transmission and reception is a waveform shaping filter that shapes the waveform of the baseband signal.

Switches 19a, 19b, 19c, 19
By switching between d and 19e, the received wave received by the antenna 1 at the time of reception is switched by the switch 19a, the LNA 3,
It is converted into baseband signals of two channels of I and Q in the quadrature mixer 12 via the BPF 4a and the switch 19b. Further, the waveform is shaped by the waveform shaping filter 23 through the switches 19c and 19d, and the switch 19
After passing through e, the amplifier 6c and the AD converter 7, it is demodulated by the digital arithmetic circuit 9. On the other hand, at the time of transmission, the baseband signals of the two channels of I and Q generated by the digital arithmetic circuit 9 are DA converter 10, LPF 11, switch 1
After 9d, undergoes waveform shaping by the waveform shaping filter 23,
Input to the quadrature mixer 12 via the switches 19e and 19c. Here, it is converted into a transmission wave, and passes through switch 19b to B
After being filtered by the PF 4b and amplified by the HPA 13, it is radiated from the antenna 1 through the switch 19a.

As described above, since the high frequency signal and the base band signal are directly converted both at the time of transmission and at the time of reception, the mixers 5a and 5b and the image frequency in the conventional transmitter / receiver as shown in FIG. The BPF 4b provided in the front stage of the mixer 5b for removing the BPF 4c and the BPF 4c provided in the rear stage of the mixer 5b for removing the local oscillation wave are unnecessary, which greatly contributes to downsizing of the device. Further, since the quadrature mixer 12 and the waveform shaping filter 23 are shared during transmission and reception, the number of parts can be reduced.

Further, in this embodiment, the first PLL circuit 15a, the second PLL circuit 15b, the reference oscillator 14a,
The configuration has been described in which the reference oscillator 14b is prepared. But,
The present invention is not limited to this, and this portion may be configured as shown in FIG. 11, FIG. 12 or FIG. 13, and the same effect is obtained.

[Embodiment 10] FIG. 18 is a block diagram of a transmitter / receiver in a system using a time division multiple access system using the same frequency at the time of transmission and at the time of reception, showing Embodiment 10 of the present invention. . In the figure, 4
g is a band pass filter for filtering a high frequency signal, 12 is a quadrature mixer that uses, for example, a diode mixer as a unit mixer and can be used for both transmission and reception, and 23 is a waveform shaping filter for shaping the base band signal. is there.

Switches 19a, 19b, 19c, 19
By switching between d and 19e, the received wave received by the antenna 1 at the time of reception is switched by the switch 19a, the LNA 3,
It is converted into a baseband signal of two channels of I and Q in the quadrature mixer 12 via the BPF 4g and the switch 19b. Further, the waveform is shaped by the waveform shaping filter 23 through the switches 19c and 19d, and the switch 19
After passing through e, the amplifier 6c and the AD converter 7, it is demodulated by the digital arithmetic circuit 9. On the other hand, at the time of transmission, the baseband signals of the two channels of I and Q generated by the digital arithmetic circuit 9 are DA converter 10, LPF 11, switch 1
After 9d, undergoes waveform shaping by the waveform shaping filter 23,
Input to the quadrature mixer 12 via the switches 19e and 19c. Here, it is converted into a transmission wave, and passes through switch 19b to B
After being filtered by the PF 4g and amplified by the HPA 13, it is radiated from the antenna 1 through the switch 19a.

As described above, since the high frequency signal and the base band signal are directly converted during both transmission and reception, the mixers 5a and 5b and the image frequency in the conventional transmitter / receiver as shown in FIG. The BPF 4b provided in the front stage of the mixer 5b for removing the BPF 4c and the BPF 4c provided in the rear stage of the mixer 5b for removing the local oscillation wave are unnecessary, which greatly contributes to downsizing of the device. Further, since the bandpass filter 4g, the cross mixer 12 and the waveform shaping filter 23 are shared during transmission and reception, the number of parts can be reduced.

Further, in the present embodiment, the first PLL circuit 15a, the second PLL circuit 15b, the reference oscillator 14a,
The configuration has been described in which the reference oscillator 14b is prepared. But,
The present invention is not limited to this, and this portion may be configured as shown in FIG. 11, FIG. 12 or FIG. 13, and the same effect is obtained.

Eleventh Embodiment FIG. 19 is a block diagram of a transmitting / receiving apparatus showing an eleventh embodiment of the present invention. In the figure, 6d is a low noise amplifier composed of individual transistors, 6e and 6f are monolithic integrated amplifiers, and 6g is a baseband signal amplifier circuit composed of low noise amplifiers 6d and monolithic integrated amplifiers 6e and 6f. Is.

The received wave is the LNA 3 and the band pass filter 4a.
After that, it is converted into a baseband signal in the reception quadrature mixer 12a. Further, it is filtered by the LPF 11a and input to the baseband signal amplifier circuit 6g. Since the signal strength of the received wave received by the antenna 1 is extremely weak, for example, about -90 dBm, the signal input to the baseband signal amplifier circuit 6g is also weak. Therefore, in order to amplify the signal to a level sufficient as the input signal of the AD converter 7, the baseband signal amplifier circuit 6g is constituted by connecting a plurality of baseband signal amplifiers in cascade connection.

However, the noise figure of an ordinary monolithically integrated base band signal amplifier is about 20 dB, and the IF amplifier 6a in the conventional transmitter / receiver shown in FIG.
Quite expensive compared to. Therefore, the noise figure of the receiving section viewed from the antenna has a very large value, and good sensitivity characteristics cannot be obtained.

Therefore, of the baseband signal amplifiers constituting the baseband signal amplifier circuit 6g, if the amplifier provided in the first stage is composed of individual transistors that can easily obtain low noise characteristics, the noise figure will be about 10 dB. The value can be obtained, and the noise figure of the receiving section viewed from the antenna can be significantly improved. On the other hand, the second and subsequent stages may be composed of a small-sized monolithically integrated baseband signal amplifier which is easy to obtain a high gain.

Further, in the present embodiment, the first PLL circuit 15a, the second PLL circuit 15b, the reference oscillator 14a,
The configuration has been described in which the reference oscillator 14b is prepared. But,
The present invention is not limited to this, and this portion may be configured as shown in FIG. 11, FIG. 12 or FIG. 13, and the same effect is obtained.

Although the transmission / reception apparatus has been described above, the noise figure of the reception section as seen from the antenna can be greatly improved by using the same baseband signal amplification circuit 6g for the reception apparatus as well.

[Embodiment 12] The transmitter / receiver and receiver described in any of Embodiments 1 to 10 are applicable to a communication system using the frequency multiplex connection method or the time division multiplex connection method. Although they are receivers, they can be similarly applied to a communication system using a code division multiple access system.

[Embodiment 13] FIG. 20 is a block diagram of a receiver evaluation apparatus for evaluating a receiver such as a transmitter / receiver and a receiver according to Embodiment 13 of the present invention. In the figure, 24 is a white noise generator, 2
5 is a band pass filter (BPF), 26 is a band elimination filter (BRF), 27 is a receiving unit under measurement, 28 is an antenna terminal of the receiving unit under measurement, 29 is an intermediate frequency signal output terminal of the receiving unit under measurement, and 30 is It is a spectrum analyzer. B
The RF 26 has its stop band within the pass band of the BPF 25.

FIG. 21 shows a spectrum of a signal input to a satellite communication receiver having the same configuration as the receiver 16 of the conventional transmitter / receiver shown in FIG. 25, for example. Signals of equal intensity exist in the specified frequency band at equal intervals. These signals are filtered by a plurality of bandpass filters, and finally only the desired signal is extracted. However, many signals before being filtered are input to the amplifier on the way, and intermodulation distortion occurs due to the non-linearity of the amplifier. As shown in FIG. 22, a signal of frequency f1 adjacent to the desired signal and f1
When a signal of frequency f2 adjacent to is input, an intermodulation distortion of 2f1-f2, which is the same frequency as the desired signal, occurs. This intermodulation distortion interferes with the desired signal and the desired signal cannot be demodulated correctly.

When such intermodulation distortion characteristics are evaluated, two signal sources are prepared, two signals corresponding to f1 and f2 are input, and 2f corresponding to the frequency of the desired signal is input.
The extent to which the 1-f2 intermodulation distortion component is output is measured. However, in practice, as shown in FIG. 22, f2 and the signal f3 adjacent to f2 also cause intermodulation distortion of 3f2-2f3, which is the frequency of the desired signal. Similarly, all signals in the band cause intermodulation distortion equal to the frequency of the desired signal, so in order to bring the measurement conditions closer to the actual usage conditions, prepare a number of signal sources equal to the number of signals in the band. Must be done and is difficult to achieve.

FIG. 23 shows the BPF 25 and the BP.
The white noise band-limited by BRF26 which has a stop band in the pass band of F25 is shown. The band in which the white noise exists corresponds to the signal portion of the other channel in FIG. 21, and the slit portion corresponds to the desired signal portion. When such a waveform is input to the receiving device, intermodulation distortion occurs in the slit portion as shown in FIG. 24 due to the non-linearity of the amplifier in the receiving device. By measuring the intensity of this intermodulation distortion with the spectrum analyzer 30, it is possible to evaluate the intermodulation distortion characteristic of the receiving device when signals of a large number of other channels are input. That is, according to the present invention, it is possible to easily realize the measurement condition close to the actual use condition.

[0075]

According to the present invention, the transmitting quadrature mixer vector-modulates the carrier wave by the baseband signal to generate the transmitting wave, and the receiving quadrature mixer inputs the receiving wave and the carrier wave. To output a baseband signal, and
Since the sum of the output waves of two different frequencies or the wave of the difference frequency is used as the carrier of the quadrature mixer for transmission, the number of filters can be reduced and the spectrum of the transmission wave is deteriorated even if the transmission wave leaks to the PLL circuit. Since there is no need to provide a strict shield, there is an effect that the transmitter / receiver can be made compact and lightweight.

According to the third or fourth aspect of the invention, the carrier wave is vector-modulated by the baseband signal by the transmitting quadrature mixer to generate the transmitting wave, and the receiving wave and the carrier wave are input to the receiving quadrature mixer. -Reduces the number of filters because it outputs a band signal and splits the sum or difference frequency wave of the output waves of two different frequencies by the demultiplexing circuit and uses it as the carrier wave of the reception or transmission quadrature mixer. In addition, since the spectrum of the transmitted wave does not deteriorate even if the transmitted wave leaks to the PLL circuit, there is no need to perform a strict shield, and there is an effect that the transmitter / receiver can be made compact and lightweight.

According to the fifth or sixth aspect of the present invention, the transmission quadrature mixer vector-modulates the carrier wave with the baseband signal to generate a transmission wave, and the reception wave and the carrier wave are input to the reception quadrature mixer. -The number of filters can be reduced because a band signal is output and the wave of the sum or difference frequency of the output waves of two different frequencies is time-divided by the switching means to be the carrier wave of the quadrature mixer for reception or transmission. At the same time, since the spectrum of the transmitted wave does not deteriorate even if the transmitted wave leaks to the PLL circuit, there is no need to perform a strict shield, which has an effect of reducing the size and weight of the transmitting / receiving device.

According to the invention of claim 7 or 10, the first
The switching means and the second switching means switch the connection destination of the quadrature mixer and the bandpass filter to the transmission section or the reception section, and the bandpass filter for filtering the high frequency signal and the quadrature mixer are shared during transmission and reception. Therefore, it is possible to reduce the number of component parts of the device and to reduce the size and weight of the transmitting / receiving device.

According to the invention of claim 8 or 10, the first
Since the connection destination of the waveform shaping filter can be switched to the transmission unit or the reception unit by the switching unit and the second switching unit and the waveform shaping filter can be shared during transmission and reception, the number of component parts of the apparatus can be reduced. The effect is that the transceiver device can be made smaller and lighter.

According to the invention of claim 9 or 10, the first
From the fourth to fourth switching means, the connection destination of the quadrature mixer and the waveform shaping filter can be switched to the transmission unit or the reception unit, and the quadrature mixer and the waveform shaping filter can be shared during transmission and reception, so that the component parts of the device It is possible to reduce the size and weight of the transmitter / receiver.

According to the eleventh or twelfth aspect of the present invention, the baseband signal amplifying means of the receiving section has a low noise amplifier in which the first stage is formed of individual transistors and the like, and the latter stage is a monolithically integrated baseband signal amplifier. Since it is a baseband signal amplifying circuit composed of a plurality of baseband signal amplifiers, it is effective in improving the noise figure of the receiving section.

According to the thirteenth aspect of the present invention, even in a communication system using the code division multiple access system, the transmission / reception new device can be made smaller and lighter, and the transmission / reception device can be made smaller and lighter by reducing the number of components. There is an effect that can be achieved, or there is an effect that the noise figure of the receiving unit is good.

According to the fourteenth aspect of the invention, as the pseudo signal source, the white noise source band-limited by the band pass filter and the band elimination filter having the stop band in the pass band of the band pass filter is used. When evaluating the intermodulation distortion characteristic of the receiver, there is an effect that a measurement condition close to an actual usage state can be easily realized.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a transmission / reception device showing a first embodiment of the present invention.

FIG. 2 is a configuration diagram of a transmission / reception device showing the first embodiment of the present invention.

FIG. 3 is a configuration diagram of a transmission / reception device showing a second embodiment of the present invention.

FIG. 4 is a configuration diagram of a transmission / reception device showing a second embodiment of the present invention.

FIG. 5 is a configuration diagram of a transmission / reception device showing a third embodiment of the present invention.

FIG. 6 is a characteristic diagram for explaining the operation of the duplexer.

FIG. 7 is a configuration diagram of a transmission / reception device showing a third embodiment of the present invention.

FIG. 8 is a configuration diagram of a transmission / reception apparatus showing an embodiment 4 of the present invention.

FIG. 9 is a configuration diagram of a transmission / reception apparatus showing an embodiment 4 of the present invention.

FIG. 10 is a configuration diagram of a transmission / reception device showing a fifth embodiment of the present invention.

FIG. 11 is a configuration diagram of a transmission / reception device showing a fifth embodiment of the present invention.

FIG. 12 is a configuration diagram of a transmission / reception device showing an embodiment 6 of the invention.

FIG. 13 is a configuration diagram of a transmission / reception device showing an embodiment 6 of the invention.

FIG. 14 is a configuration diagram of a transmission / reception device showing an embodiment 7 of the invention.

FIG. 15 is a configuration diagram for explaining a configuration of an orthogonal mixer.

FIG. 16 is a configuration diagram of a transmission / reception device showing an eighth embodiment of the present invention.

FIG. 17 is a configuration diagram of a transmission / reception device showing an embodiment 9 of the invention.

FIG. 18 is a configuration diagram of a transmission / reception device showing an embodiment 10 of the invention.

FIG. 19 is a configuration diagram of a transmission / reception device showing an eleventh embodiment of the present invention.

FIG. 20 is a configuration diagram of a receiver evaluation apparatus showing Embodiment 13 of the present invention.

FIG. 21 is a diagram showing an example of a signal input to a satellite communication receiving device.

FIG. 22 is a diagram for explaining intermodulation distortion that occurs in the receiving device.

FIG. 23 is a diagram illustrating an output waveform of a pseudo signal source of the receiver evaluation device.

FIG. 24 is a diagram showing an output waveform of the receiving unit when a signal output from the pseudo signal source is input.

FIG. 25 is a block diagram showing a conventional transmission / reception device.

FIG. 26 is a diagram for explaining a relationship between a reception frequency of a conventional transceiver and a pass band of a band pass filter.

FIG. 27 is a diagram showing a configuration example of a PLL circuit.

FIG. 28 is a block diagram showing a conventional transmission / reception device.

FIG. 29 is a diagram showing a spectrum of an input signal of the phase comparator.

FIG. 30 is a configuration diagram showing a conventional transceiver.

[Explanation of symbols]

1 antenna, 2 duplexer (DUP), 3 low noise amplifier (LNA), 4 band pass filter (BPF),
5 mixers, 6 amplifiers (AMPs), 7 AD converters,
8 digital filters, 9 digital arithmetic circuits, 1
0 DA converter, 11 low pass filter (LPF),
12 Quadrature Mixer, 13 High Power Amplifier (HPA), 1
4 reference oscillators, 15 PLL circuits, 16 receivers, 1
7 transmitter, 18 demultiplexing circuit, 19 switch, 20
I channel unit mixer, 21 Q channel unit mixer, 22 90 degree phase shifter, 23 waveform shaping filter, 24 white noise generator, 25 band pass filter, 26 band elimination filter, 27 measured receiver, 2
8 antenna terminal of receiving unit under test, 29 intermediate frequency signal output terminal of receiving unit under test, 30 spectrum analyzer, 101 reference signal input terminal, 102 phase comparator,
103 frequency divider, 104 voltage controlled oscillator, 105 output signal terminal.

Claims (14)

[Claims] 1. One or two reference oscillators, first and second PLL oscillation circuits that output signals of different frequencies synchronized with the output of the reference oscillator, and the first PLL oscillation circuit. A frequency converter having a mixer for frequency mixing the output and the output of the second PLL oscillation circuit, and a bandpass filter for selecting either the sum or difference frequency wave output by the mixer, and a baseband signal. By means of which the output wave of the frequency converter is vector-modulated as a carrier wave and which has a quadrature mixer including two unit mixers for generating a transmitted wave, and a received wave and an output wave of the first PLL oscillation circuit as a carrier wave. A transceiver having a quadrature mixer including two unit mixers for inputting and outputting a baseband signal, and a transceiver. 2. A reference oscillator, a PLL oscillation circuit that outputs a signal of a frequency different from the output of the reference oscillator in synchronization with the output of the reference oscillator, and an output of the reference oscillator and an output of the PLL oscillation circuit. A frequency converter having a mixer for frequency mixing and a bandpass filter for selecting either a sum or difference frequency wave output by the mixer, and a vector modulation using the output wave of the frequency converter as a carrier by a baseband signal. Then, a transmitter having a quadrature mixer including two unit mixers for generating a transmission wave, a reception wave and an output wave of either the reference oscillator or the PLL oscillation circuit are input as a carrier wave, and a baseband signal is output. And a receiver having an orthogonal mixer including two unit mixers. 3. One or two reference oscillators, first and second PLL oscillation circuits that output signals of different frequencies in synchronization with the output of the reference oscillator, and the first PLL oscillation circuit. A mixer for frequency mixing the output and the output of the second PLL oscillator circuit, and a demultiplexer circuit connected to the mixer for outputting waves of the sum and difference frequencies output from the mixer from different first and second terminals, respectively. A frequency converter having, a transmitter having a quadrature mixer including two unit mixers for vector-modulating one of the output waves of the demultiplexing circuit as a carrier by a baseband signal, and a received wave. And a receiving section having a quadrature mixer including two unit mixers for inputting the other output wave of the demultiplexing circuit as a carrier wave and outputting a base band signal. Receiver. 4. A reference oscillator, a PLL oscillation circuit which outputs a signal of a frequency different from the output of the reference oscillator in synchronization with the output of the reference oscillator, and an output of the reference oscillator and an output of the PLL oscillation circuit. A frequency converter having a mixer for frequency mixing and a demultiplexer circuit connected to the mixer for outputting waves of the sum and difference frequencies output by the mixer from different first and second terminals respectively, and a baseband signal A transmitter having a quadrature mixer including two unit mixers for vector-modulating one output wave of the demultiplexing circuit as a carrier wave, and a receiving wave and the other output wave of the demultiplexing circuit as a carrier wave. A transceiver having a quadrature mixer including two unit mixers for inputting and outputting a baseband signal, and a transceiver. 5. One or two reference oscillators, first and second PLL oscillation circuits that output signals of different frequencies in synchronization with the output of the reference oscillator, and the first PLL oscillation circuit. A frequency converter having a mixer for frequency mixing the output and the output of the second PLL oscillation circuit, and a bandpass filter for selecting either the sum or difference frequency wave output by the mixer, and the frequency converter. Switching means for changing the supply destination of the output of the frequency converter, and vector-modulating the output wave of the frequency converter supplied from the switching means by the base band signal as a carrier wave to generate a transmission wave. A transmitter having an orthogonal mixer including two unit mixers, a received wave and an output wave of the frequency converter supplied from the switching means are inputted as a carrier wave, A receiver having a quadrature mixer including two unit mixers for outputting a band signal, and a transmitter / receiver. 6. A reference oscillator, a PLL oscillation circuit that outputs a signal of a frequency different from the output of the reference oscillator in synchronization with the output of the reference oscillator, and an output of the reference oscillator and an output of the PLL oscillation circuit. A frequency converter having a mixer for frequency mixing and a bandpass filter that is connected to the mixer and selects one of the sum or difference frequency waves output by the mixer, and is connected to the frequency converter.
Switching means for changing the supply destination of the output of the frequency converter, and two unit mixers for vector-modulating the output wave of the frequency converter supplied from the switching means by the base band signal as a carrier to generate a transmission wave. And a receiving section having a quadrature mixer including two unit mixers each of which receives a received wave and an output wave of the frequency converter supplied from the switching means as a carrier and outputs a baseband signal. And a transmitter / receiver. 7. One or two reference oscillators, first and second PLL oscillation circuits that output signals of different frequencies in synchronization with the output of the reference oscillator, and the first PLL oscillation circuit. A frequency converter having a mixer for frequency mixing the output and the output of the second PLL oscillation circuit, and a bandpass filter for selecting either the sum or difference frequency wave output by the mixer, and the frequency converter. And a quadrature mixer including two unit mixers to which the output wave of the frequency converter is input as a carrier wave, and one end of which is connected to a high frequency signal input / output terminal of the quadrature mixer and is input to the quadrature mixer. Wave and a transmission wave generated from the quadrature mixer, and a first switching means connected to the other end of the bandpass filter; Second switching means connected to the baseband signal input / output terminal of the cross mixer, the first switching means and the second switching means transmitting the connection destination of the quadrature mixer and the bandpass filter. Section or the receiving section, and the quadrature mixer vector-modulates the carrier wave with the baseband signal input from the transmitting section to generate a transmission wave, or generates a transmission wave with the input reception wave and the carrier wave. A transmission / reception device characterized by generating a band signal and outputting it to a receiving unit. 8. One or two reference oscillators, first and second PLL oscillation circuits that output signals of different frequencies in synchronization with the output of the reference oscillator, and the first PLL oscillation circuit. A frequency converter having a mixer for frequency mixing the output and the output of the second PLL oscillation circuit, and a bandpass filter for selecting either the sum or difference frequency wave output by the mixer, and the frequency converter. Switching means for changing the supply destination of the output of the frequency converter and vector modulation of the output wave of the frequency converter supplied from the switching means by the base band signal as a carrier wave to generate a transmission wave. A transmitter having a first quadrature mixer including two unit mixers, a received wave and an output wave of the frequency converter supplied from the switching means are input as a carrier wave, A receiver having a second quadrature mixer including two unit mixers for outputting a baseband signal;
The first switching means is connected to the baseband signal input terminal of the first quadrature mixer of the transmitting section, and the second switching means is connected to the baseband signal output terminal of the second quadrature mixer of the receiving section. A switching means; and a waveform shaping filter connected between the first switching means and the second switching means for shaping the waveform of the baseband signal, the first switching means and the second switching means. A transmitting / receiving apparatus, characterized in that a connection destination of the waveform shaping filter is switched by the means so as to switch to the transmitting unit or the receiving unit. 9. One or two reference oscillators, first and second PLL oscillation circuits that output signals of different frequencies synchronized with the output of the reference oscillator, and the first PLL oscillation circuit. A frequency converter having a mixer for frequency mixing the output and the output of the second PLL oscillation circuit, and a bandpass filter for selecting either the sum or difference frequency wave output by the mixer, and the frequency converter. And a quadrature mixer including two unit mixers to which the output wave of the frequency converter is input as a carrier wave, and a first switching means having one end connected to the high frequency signal input / output terminal side of the quadrature mixer, Second switching means having one end connected to the baseband signal input / output terminal of the quadrature mixer, and third switching means connected to the other end of the second switching means by switching. A switching means and a fourth switching means; and a waveform shaping filter connected between the third switching means and the fourth switching means for shaping the waveform of the base band signal, and the first to the first switching means. A transmitting / receiving apparatus, wherein the switching means of 4 is arranged so that the connection destination of the quadrature mixer and the waveform shaping filter is switched to the transmitting unit or the receiving unit. 10. The transmitter / receiver according to claim 7, 8 or 9, wherein one or two reference oscillators and first and second PLLs that output signals of different frequencies synchronized with the outputs of the reference oscillators are provided. Oscillation circuit, the first PLL
Instead of a frequency converter having a mixer for frequency mixing the output of the oscillator circuit and the output of the second PLL oscillator circuit and a bandpass filter for selecting either the sum or difference frequency wave output by the mixer The frequency of the reference oscillator, the PLL oscillator circuit that outputs a signal of a frequency different from the output of the reference oscillator in synchronization with the output of the reference oscillator, and the output of the reference oscillator and the output of the PLL oscillator circuit. A transmitter / receiver comprising: a mixer; and a frequency converter having a bandpass filter connected to the mixer and selecting either a wave of a sum frequency or a difference frequency output from the mixer. 11. A baseband signal amplifying means of a receiving unit for amplifying a baseband signal from a quadrature mixer including two unit mixers for receiving a received wave and a carrier and outputting a baseband signal is provided in a first stage. A transmission / reception characterized by a low noise amplifier formed of individual transistors and the like, and a baseband signal amplifier circuit composed of a plurality of baseband signal amplifiers which are monolithically integrated baseband signal amplifiers in the subsequent stage. apparatus. 12. A baseband signal amplifying means of a receiving unit for amplifying a baseband signal from a quadrature mixer including two unit mixers for receiving a received wave and a carrier and outputting a baseband signal, is provided with a first stage. A low-noise amplifier formed of individual transistors and the like, and a base-band signal amplifier circuit composed of a plurality of base-band signal amplifiers that are monolithically integrated base-band signal amplifiers in the subsequent stage apparatus. 13. A communication system, wherein the transmission / reception device according to any one of claims 1 to 11 or the reception device according to claim 12 is applied and a code division multiple access system is used. 14. A receiver evaluation apparatus comprising a pseudo signal source connected to an input end of a measured receiver and an output signal measuring device connected to an output end of the measured receiver. A receiver evaluation apparatus, wherein a white noise source band-limited by a band-pass filter and a band-elimination filter having a stop band in the pass band of the band-pass filter is used.