WO2016021178A1 - 送信機、送信システムおよび送信方法 - Google Patents
送信機、送信システムおよび送信方法 Download PDFInfo
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- 238000004891 communication Methods 0.000 description 8
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- 230000003287 optical effect Effects 0.000 description 4
- 239000013307 optical fiber Substances 0.000 description 4
- 230000008859 change Effects 0.000 description 3
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
- H03F3/21—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers with semiconductor devices only
- H03F3/217—Class D power amplifiers; Switching amplifiers
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/02—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation
- H03F1/0205—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers
- H03F1/0211—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers with control of the supply voltage or current
- H03F1/0216—Continuous control
- H03F1/0222—Continuous control by using a signal derived from the input signal
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/32—Modifications of amplifiers to reduce non-linear distortion
- H03F1/3241—Modifications of amplifiers to reduce non-linear distortion using predistortion circuits
- H03F1/3247—Modifications of amplifiers to reduce non-linear distortion using predistortion circuits using feedback acting on predistortion circuits
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
- H03F3/21—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers with semiconductor devices only
- H03F3/217—Class D power amplifiers; Switching amplifiers
- H03F3/2171—Class D power amplifiers; Switching amplifiers with field-effect devices
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
- H03F3/21—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers with semiconductor devices only
- H03F3/217—Class D power amplifiers; Switching amplifiers
- H03F3/2175—Class D power amplifiers; Switching amplifiers using analogue-digital or digital-analogue conversion
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
- H03F3/24—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers of transmitter output stages
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers
- H03G3/02—Manually-operated control
- H03G3/04—Manually-operated control in untuned amplifiers
- H03G3/10—Manually-operated control in untuned amplifiers having semiconductor devices
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/02—Transmitters
- H04B1/04—Circuits
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F2200/00—Indexing scheme relating to amplifiers
- H03F2200/331—Sigma delta modulation being used in an amplifying circuit
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/02—Transmitters
- H04B1/04—Circuits
- H04B2001/0408—Circuits with power amplifiers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/0008—Modulated-carrier systems arrangements for allowing a transmitter or receiver to use more than one type of modulation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/02—Amplitude-modulated carrier systems, e.g. using on-off keying; Single sideband or vestigial sideband modulation
- H04L27/04—Modulator circuits; Transmitter circuits
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/02—Amplitude-modulated carrier systems, e.g. using on-off keying; Single sideband or vestigial sideband modulation
- H04L27/08—Amplitude regulation arrangements
Definitions
- FIG. 12 shows a block configuration diagram of a wireless communication device disclosed in Patent Document 1.
- 12 includes a baseband signal generation unit 910, an up-conversion unit 920, a class D amplifier 930, and a bandpass filter unit 940.
- the class D amplifier 930 includes a bandpass ⁇ modulation unit 931, a drive amplification unit 932, a switching voltage control unit 933, and a class D amplification unit 934.
- a transmission system includes a baseband signal generation unit that outputs an amplitude value and a phase value of a baseband signal, and performs ⁇ modulation on the output amplitude value and phase value.
- ⁇ modulation means for outputting a pulse signal train
- branch means for branching and outputting the output pulse signal train
- n transmission circuits to which the n-branched pulse signal train is respectively input
- Each of the n transmission circuits includes extraction means for extracting and outputting an amplitude value of a baseband component from the input pulse signal sequence, and a subsequent stage according to the amplitude value of the extracted baseband component
- a voltage for canceling the phase error generated in the amplifier is determined, and the power supply modulation means for supplying the determined voltage to the pre-stage amplifier, and the input pulse signal using the supplied voltage.
- a pre-stage amplifier that adjusts the level of the string
- a post-stage amplifier that amplifies the pulse signal string whose level is adjusted
- a filter unit that generates and output
- FIG. 1 is a block configuration diagram of a wireless communication apparatus 900 according to Patent Document 1.
- FIG. It is the figure which showed the relationship between the duty ratio and distortion of a common digital transmitter.
- the ⁇ modulation means 30 performs ⁇ modulation on the amplitude value and phase value of the input baseband signal, and quantizes them into a binary pulse signal sequence.
- the ⁇ modulation unit 30 outputs the quantized pulse signal sequence to the preamplifier 50.
- the ⁇ modulation means 30 performs ⁇ modulation using an envelope ⁇ modulation method, a low-pass ⁇ modulation method, or a bandpass ⁇ modulation method.
- the power supply modulation means 40 determines a voltage for canceling the phase error generated in the post-stage amplifier 60 according to the amplitude value of the input baseband signal, and supplies the determined voltage to the pre-stage amplifier 50.
- a class D amplifier can be applied to the post-stage amplifier 60.
- the pulse signal string input from the pre-stage amplifier 50 is amplified while maintaining the pattern of the pulse string, and is output to the filter means 70.
- the transmitter 10 configured as described above determines a voltage for canceling the phase error generated in the rear-stage amplifier 60 according to the amplitude value of the baseband signal input in the power supply modulation means 40 and supplies it to the front-stage amplifier 50. Supply.
- a characteristic opposite to the AM-PM distortion generated in the post-stage amplifier 60 is added in the pre-stage amplifier 50, and a high-quality output pulse signal from which the phase error is eliminated is input to the filter means 70.
- the baseband signal generation unit 110 generates and outputs two types of signals, that is, an amplitude value and a phase value of the input baseband signal.
- Baseband signal generation section 110 outputs the generated amplitude value and phase value to envelope ⁇ modulator 120 and outputs the generated amplitude value to power supply modulation section 130.
- the pre-stage amplifier 140 amplifies the output pulse signal input from the envelope ⁇ modulator 120 with the voltage supplied from the power supply modulation unit 130 and outputs the amplified signal to the class D amplifier 150.
- the class D amplifier 150 amplifies the output pulse signal input from the pre-stage amplifier 140 to a desired level while maintaining the pulse train pattern, and outputs the amplified signal to the band pass filter 160.
- most of the power consumed in the transmitter 100 is consumed in the class D amplifier 150.
- the class D amplifier 150 can theoretically obtain a power conversion efficiency of 100% if there is no power loss caused by parasitic elements. Therefore, by reducing the power loss in the class D amplifier 150 by preliminarily processing the output pulse signal input to the class D amplifier 150 to cancel the AM-PM distortion generated in the class D amplifier 150, Power saving of the transmitter 100 can be achieved.
- the pre-stage amplifier 140 and the class D amplifier 150 are formed separately, but the pre-stage amplifier 140 may be included in the class D amplifier 150.
- the ⁇ modulator 170 quantizes the I signal and the Q signal input from the baseband signal generation unit 110B by applying the low-pass ⁇ modulation method or the band-pass ⁇ modulation method, and outputs the output pulse signal to the pre-stage amplifier 140. To do. Since the details of the low-pass ⁇ modulation method and the bandpass ⁇ modulation method are described in Non-Patent Documents 2 and 3, detailed descriptions thereof are omitted.
- the amplitude value output from the baseband signal generation unit 110 is input to the power supply modulation unit 130, but the present invention is not limited to this.
- the baseband component of the output spectrum from the envelope ⁇ modulator 120 is the same as the spectrum of the amplitude value input to the ⁇ modulator on the principle of envelope ⁇ modulation.
- FIG. 5 shows a block diagram of the transmitter according to this embodiment.
- a transmitter 100C in FIG. 5 includes a low-pass filter 210 and a power supply modulator 130 arranged in a subsequent stage of the envelope ⁇ modulator 120 in the transmitter 100 in FIG. 2 and between the envelope ⁇ modulator 120 and the preamplifier 140. It is formed by disposing the delay part 220 in the above.
- the power supply modulator 130 calculates a voltage for canceling the AM-PM characteristic of the class D amplifier 150 and supplies it to the pre-stage amplifier 140.
- the power supply modulation unit 130 ′ includes an LUT (Look Up Table) 131, a DAC (Digital-to-Analog Converter) 132, and a linear amplification unit 133.
- the LUT 131 outputs a value in an address corresponding to the amplitude value input from the baseband signal generation unit 110.
- the DAC 132 converts the value output from the LUT 131 into an analog signal and outputs the analog signal.
- the linear amplification unit 133 amplifies the analog signal output from the DAC 132 and supplies the amplified analog signal to the pre-stage amplifier 140 ′.
- an amplifier with high linearity such as an operational amplifier or a class A amplifier is applied.
- the pre-stage amplifier 140 ' is realized by an inverter circuit using n-MOS and p-MOS, and the supply voltage from the power supply modulation unit 130' is supplied to the source of the p-MOS.
- an inverter using a resistor or a class A or class B amplifier can be applied as the pre-stage amplifier 140 'instead of the p-MOS.
- FIG. 7 shows a functional block diagram when a mechanism for updating the LUT 131 is arranged in the transmitter 100 ′ in FIG. 6.
- a low-pass filter 310 and a pulse phase error detection unit 320 are arranged as a mechanism for updating the LUT 131.
- the low-pass filter 310 extracts the baseband component by removing the high-frequency component of the output pulse signal output from the envelope ⁇ modulator 120, and outputs it to the pulse phase error detection unit 320 as the amplitude value of the baseband component.
- the duty ratio of the output pulse signal output from the envelope ⁇ modulator 120 is proportional to the amplitude value of the baseband component, and the duty ratio is 50% at the maximum amplitude value and 0% at the minimum amplitude. In the present embodiment, by utilizing this property, the duty ratio of the output pulse signal output from the envelope ⁇ modulator 120 is measured, and the amplitude value of the baseband component is acquired using the duty ratio.
- the pulse phase error detector 320 receives the amplitude value (duty ratio) of the baseband component from the low-pass filter 310 and the output pulse signals from the envelope ⁇ modulator 120 and the class D amplifier 150, respectively. Then, the pulse phase error detection unit 320 determines the phase of the baseband component from the output pulse signal (input signal) input from the envelope ⁇ modulator 120 and the output pulse signal (output signal) input from the class D amplifier 150. Get the error. For example, the pulse phase error detection unit 320 synchronizes two input output pulse signals, normalizes the two output pulse signals into binary values of 0 and 1 using a comparator, and then uses a logic circuit. By extracting both error components, the baseband phase error included in the pulse is acquired.
- a predetermined value (initial value) set in advance is set in the LUT 131 in the initial state.
- a predetermined voltage (a constant value) is supplied to the preamplifier 140D.
- the phase error in each amplitude value is acquired by the pulse phase error detector 320, and the value in the address corresponding to each amplitude value of the LUT 131 is updated so as to cancel the acquired phase error (feedback control).
- the value in the address of the LUT 131 corresponding to the amplitude value A1 is lowered.
- the voltage of the preamplifier 140D becomes lower than before the change. Due to this voltage drop, the threshold value of the transistor of the preamplifier 140D is lowered, and as a result, the pulse rising timing is accelerated, and the baseband phase component of the preamplifier 140D is increased toward + compared to before the change.
- the update amount for example, there is a method of setting a value proportional to the phase error amount. In this case, k is a constant value, and the value B1 in the address of the LUT 131 corresponding to the amplitude value A1 is updated to B1 + kC1.
- the baseband phase error detector 440 synchronizes the input baseband signal and the output baseband signal, and calculates the input / output baseband phase error depending on the amplitude value of the input baseband signal.
- AM-PM distortion generated in the transmitter 100E is detected.
- the baseband phase error detection unit 440 updates the value in the address corresponding to each amplitude value of the LUT 131 so as to cancel the detected AM-PM distortion (feedback control).
- the input baseband signal (two types of signals of amplitude value and phase value) is input from the baseband signal generation unit 110 to the baseband phase error detection unit 440 '. Further, a part of the RF signal output from the bandpass filter 160 is input to the baseband phase error detection unit 440 ′ as an output baseband signal by passing through the down converter 460 and the lowpass filter 450.
- the baseband phase error detection unit 440 detects AM-PM distortion generated in the transmitter 100F by calculating the phase error by synchronizing the input baseband signal and the output baseband signal. Then, the baseband phase error detection unit 440 'updates the value in the address corresponding to each amplitude value of the LUT 131 so as to cancel the detected AM-PM distortion (feedback control).
- each transmitting device 100G includes an O / E (optic-electric) converter 510G, a driver amplifier 520G, a low-pass filter 530G, a power supply modulator 130G, a delay unit 540G, a preamplifier 140G, a class D amplifier 150G, A band-pass filter 160G, a low-pass filter 550G, and a pulse phase error detection unit 560G are provided.
- the power supply modulation unit 130G includes an ADC (Analog-to-Digital Converter) 134G, an LUT 131G, a DAC 132G, and a linear amplification unit 133G.
- ADC Analog-to-Digital Converter
- the amplitude value and the phase value output from the baseband signal generation unit 610 are ⁇ modulated by the envelope ⁇ modulator 620 and output as an output pulse signal.
- the output pulse signal output from the envelope ⁇ modulator 620 is amplified by the driver amplifier 630, converted from an electric signal to an optical signal by the E / O converter 640, and then transmitted to the coupler 660 via the optical fiber 650.
- the coupler 660 branches the input optical signal and outputs it to the plurality of transmission devices 100G.
- the LUT 131G is feedback-controlled by the same method as the transmitter 100D of FIG. 7 described in the third embodiment, but the present invention is not limited to this.
- a method similar to that of the transmitter 100E of FIG. 8 according to the modification of the third embodiment can be applied.
- FIG. 11 shows a system configuration diagram of the transmission system 600B in this case as a reference.
- the method of feedback control of the LUT 131G is not limited to these, and for example, a method similar to that of the transmitter 100F of FIG. 9 according to the modification of the third embodiment can be applied.
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Abstract
Description
本発明の第1の実施形態について説明する。本実施形態に係る送信機のブロック構成図を図1に示す。図1において、送信機10は、ベースバンド信号生成手段20、ΔΣ変調手段30、電源変調手段40、前段増幅器50、後段増幅器60およびフィルタ手段70を備える。
第2の実施形態について説明する。本実施形態に係る送信機は、例えば、携帯電話システムや無線LAN(Local Area Network)機器等の通信・放送機器等において用いることができる。本実施形態に係る送信機のブロック構成図を図2に示す。図2に示された送信機100は、ベースバンド信号生成部110、エンベロープΔΣ変調器120、電源変調部130、前段増幅器140、D級増幅器150およびバンドパスフィルタ160を備える。
第2の実施形態においては、ΔΣ変調器における変調方式として、エンベロープΔΣ変調方式を適用したが、これに限定されない。エンベロープΔΣ変調方式の代わりに、ローパスΔΣ変調方式やバンドパスΔΣ変調方式を適用することもできる。
第3の実施形態について説明する。本実施形態に係る送信機の機能ブロック図を図6に示す。図6に示された送信機100’は、ベースバンド信号生成部110、エンベロープΔΣ変調器120、電源変調部130’、前段増幅器140’、D級増幅器150およびバンドパスフィルタ160を備える。本実施形態に係る送信機100’は、図2の送信機100において、電源変調部130および前段増幅器140の具体的な構成例を示したものである。ベースバンド信号生成部110、エンベロープΔΣ変調器120、D級増幅器150およびバンドパスフィルタ160は、第2の実施形態で説明した図2の送信機100のそれらと同様である。
第3の実施形態の変形例について説明する。第3の実施形態においては、パルス位相誤差検知部320は、エンベロープΔΣ変調器120から出力された出力パルス信号とD級増幅器150から出力された出力パルス信号とから、論理演算等を用いて両パルスに含まれるベースバンド成分の位相誤差を取得し、AM-PM歪を間接的に算出した。これに対して、第3の実施形態の変形例においては、エンベロープΔΣ変調器120から出力された出力パルス信号からベースバンド信号を抽出し、抽出したベースバンド信号(入力信号)とバンドパスフィルタ160から出力されたベースバンド信号(出力信号)とからAM-PM歪を直接算出する。
第4の実施形態について説明する。本実施形態では、上述の実施形態に係る送信機が複数配置された送信システムについて説明する。本実施形態に係る送信システムのシステム構成図を図10に示す。図10において、送信システム600は、ベースバンド信号生成部610、エンベロープΔΣ変調器620、ドライバアンプ630、E/O(electric-optic)変換部640、光ファイバ650、カプラ660および複数の送信装置100Gによって構成される。
20 ベースバンド信号生成手段
30 ΔΣ変調手段
40 電源変調手段
50 前段増幅器
60 後段増幅器
70 フィルタ手段
100、100B、100’、100C、100D、100E、100F 送信機
100G 送信装置
110、110B、610 ベースバンド信号生成部
120、620 エンベロープΔΣ変調器
130、130D、130G 電源変調部
131 LUT
132 DAC
133 線形増幅部
140、140D、140G 前段増幅器
150、150G D級増幅器
160、160G バンドパスフィルタ
170 ΔΣ変調器
210、530G ローパスフィルタ
220、540G 遅延部
310、550G ローパスフィルタ
320、560G パルス位相誤差検知部
410 バンドパスフィルタ
420、460 ダウンコンバータ
430、450 ローパスフィルタ
440 ベースバンド位相誤差検知部
510G O/E変換部
520G ドライバアンプ
600 送信システム
630 ドライバアンプ
640 E/O変換部
650 光ファイバ
660 カプラ
900 無線通信装置
910 ベースバンド信号発生部
920 アップコンバート部
930 D級増幅器
931 バンドパスΔΣ変調部
932 駆動増幅部
933 スイッチング電圧制御部
934 D級増幅部
940 バンドパスフィルタ部
Claims (10)
- ベースバンド信号の振幅値と位相値を出力するベースバンド信号生成手段と、
前記出力された振幅値と位相値に対してΔΣ変調を行い、パルス信号列を出力するΔΣ変調手段と、
前記出力された振幅値に応じて電圧を決定し、決定した電圧を前段増幅器へ供給する電源変調手段と、
前記供給された電圧を用いて、前記出力されたパルス信号列のレベルを調整する前段増幅器と、
前記レベルが調整されたパルス信号列を増幅する後段増幅器と、
前記増幅されたパルス信号列から出力信号を生成して出力するフィルタ手段と、
を備え、
前記電源変調手段は、前記出力された振幅値に応じて、前記後段増幅器において生じる位相誤差を打ち消すための電圧を決定することを特徴とする送信機。 - 前記ΔΣ変調手段から出力されたパルス信号列からベースバンド成分の振幅値を抽出して出力する抽出手段をさらに備え、
前記電源変調手段は、前記ベースバンド信号生成手段から出力された振幅値に応じて電圧を決定する代わりに、前記抽出されたベースバンド成分の振幅値に応じて前記電圧を決定する、
請求項1に記載の送信機。 - 前記ΔΣ変調手段と前記前段増幅器との間に配置され、前記抽出手段および前記電源変調手段を通過することによって生じる遅延量と同じ遅延量を、前記出力されたパルス信号列へ付加する遅延手段をさらに備える、請求項2に記載の送信機。
- 前記電源変調手段は、
振幅値ごとに電圧値が登録されたテーブルを備え、
前記出力された振幅値に対応する電圧値を前記テーブルから抽出し、該抽出した電圧値を前記決定した電圧として用いる、
請求項1乃至3のいずれか1項に記載の送信機。 - 前記前段増幅器へ入力される前と前記後段増幅器から出力された後との状態を比較することによって位相誤差を検出し、該検出した位相誤差とその時の振幅値とを用いて前記テーブルを更新する更新手段をさらに備える、請求項4に記載の送信機。
- 前記ΔΣ変調手段から出力されたパルス信号列から高周波成分を取り除くことによってベースバンド成分の振幅値を抽出する第2抽出手段をさらに備え、
前記更新手段は、前記ΔΣ変調手段から出力されたパルス信号列と前記後段増幅器から出力されたパルス信号列との位相誤差を検出し、該検出した位相誤差を打ち消すように、前記第2抽出手段によって抽出された振幅値に対応する前記テーブル内の電圧値を更新する、請求項5に記載の送信機。 - 前記更新手段は、前記ベースバンド信号生成手段から出力された入力ベースバンド信号または前記ΔΣ変調手段から出力されたパルス信号列から生成された入力ベースバンド信号のどちらか一方と、前記フィルタ手段から出力された出力信号から生成された出力ベースバンド信号と、の位相誤差を検出し、該検出した位相誤差を打ち消すように、前記入力ベースバンド信号の振幅値に対応する前記テーブル内の電圧値を更新する、請求項5に記載の送信機。
- 前記出力されたパルス信号列は、前記前段増幅器を通過することによって、前記後段増幅器において生じるAM-PM歪と逆の特性を有するAM-PM歪が付与され、
前記後段増幅器は、前記AM-PM歪が付与されたパルス信号列を、パルス列のパターンを保ったまま所望のレベルまで増幅する、
請求項1乃至7のいずれか1項に記載の送信機。 - ベースバンド信号の振幅値と位相値を出力するベースバンド信号生成手段と、
前記出力された振幅値と位相値に対してΔΣ変調を行い、パルス信号列を出力するΔΣ変調手段と、
前記出力されたパルス信号列をn分岐して出力する分岐手段と、
前記n分岐されたパルス信号列がそれぞれ入力されるn台の送信回路と、
を備え、
前記n台の送信回路はそれぞれ、前記入力されたパルス信号列からベースバンド成分の振幅値を抽出して出力する抽出手段と、前記抽出されたベースバンド成分の振幅値に応じて後段増幅器において生じる位相誤差を打ち消すための電圧を決定し、決定した電圧を前段増幅器へ供給する電源変調手段と、前記供給された電圧を用いて、前記入力されたパルス信号列のレベルを調整する前段増幅器と、前記レベルが調整されたパルス信号列を増幅する後段増幅器と、前記増幅されたパルス信号列から出力信号を生成して出力するフィルタ手段と、を備える、
ことを特徴とする送信システム。 - 供給された電圧を用いて入力されたパルス信号列のレベルを調整する前段増幅器および入力されたパルス信号列を増幅する後段増幅器を備えた送信機を用いた送信方法であって、
ベースバンド信号の振幅値と位相値を出力し、
前記出力された振幅値と位相値に対してΔΣ変調を行い、パルス信号列を出力し、
前記出力された振幅値に応じて、前記後段増幅器において生じる位相誤差を打ち消すための電圧を決定し、決定した電圧を前記前段増幅器へ供給し、
前記前段増幅器において、前記出力されたパルス信号列のレベルを調整し、
前記後段増幅器において、前記レベルが調整されたパルス信号列を増幅し、
前記増幅されたパルス信号列から出力信号を生成して送信する、
送信機を用いた送信方法。
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