JPH03227137A - Direct conversion receiver - Google Patents
Direct conversion receiverInfo
- Publication number
- JPH03227137A JPH03227137A JP2023556A JP2355690A JPH03227137A JP H03227137 A JPH03227137 A JP H03227137A JP 2023556 A JP2023556 A JP 2023556A JP 2355690 A JP2355690 A JP 2355690A JP H03227137 A JPH03227137 A JP H03227137A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- low frequency
- frequency
- supplied
- signals
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000006243 chemical reaction Methods 0.000 title claims abstract description 23
- 230000010355 oscillation Effects 0.000 claims description 16
- 238000001514 detection method Methods 0.000 claims description 13
- 230000005684 electric field Effects 0.000 abstract description 6
- 230000003321 amplification Effects 0.000 description 6
- 238000003199 nucleic acid amplification method Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000035945 sensitivity Effects 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
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- Circuits Of Receivers In General (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
Description
【発明の詳細な説明】
[産業上の利用分野コ
本発明はポケットベル、移動無線電話機等に採用される
ダイレクトコンバージョン受信機に関し、−層詳細には
、供給される受信信号を低周波信号に変換し、次いで、
高周波数のFM信号に変換して、この後、レベルを示す
検出信号ならびに出力信号を導出し、さらに低周波の復
調信号に変換することにより、比較的簡単な構成におい
て、レベルの検出(受信電界レベル)が行われ、且つ安
定した受信利得が得られるようにしたものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a direct conversion receiver employed in pagers, mobile radio telephones, etc. Convert and then
Level detection (received electric field level), and a stable reception gain can be obtained.
[従来の技術]
従来、ボケットベノへ移動無線電話機等の受信部には、
高S/N比と高感度が得られ、ミキサから直接的に復調
信号等を得る比較的簡素な構成の受信機、所謂、ダイレ
クトコンバージョン受信機が採用されている。[Prior Art] Conventionally, the receiving section of mobile radio telephones, etc.
A so-called direct conversion receiver, which has a relatively simple configuration that provides a high S/N ratio and high sensitivity and obtains a demodulated signal directly from a mixer, is used.
第2図にダイレクトコンバージョン受信機の−例を示す
。FIG. 2 shows an example of a direct conversion receiver.
この例において、符号2は受信信号Saが入力される高
周波増幅回路であり、ここで分岐した高周波出力信号s
bが供給されて低周波の復調信号を送出するQチャネル
部3、■チャネル部4が設けられている。さらに、高周
波出力信号sbと略同一の発振周波数を生成して送出す
る局部発振器8と、発振周波数を90°移相する90°
移相器10を有している。In this example, reference numeral 2 is a high-frequency amplification circuit into which the received signal Sa is input, and the high-frequency output signal s branched here.
A Q channel section 3 and a (2) channel section 4 are provided to which a low frequency demodulated signal is supplied. Furthermore, a local oscillator 8 that generates and transmits an oscillation frequency that is substantially the same as the high-frequency output signal sb, and a 90° phase shifter that shifts the oscillation frequency by 90°.
It has a phase shifter 10.
Qチャネル部3、■チャネル部4はミキサ3a、4aと
、LPF3b、4bと、低周波増幅回路3C14Cが夫
々連接されている。The Q channel section 3 and the -channel section 4 are connected with mixers 3a and 4a, LPFs 3b and 4b, and a low frequency amplification circuit 3C14C, respectively.
前記の構成は周知のダイレクトコンバージョンが行われ
るものであり、高周波出力信号sbと略同一の発振周波
数をミキサ3a、4aで混合して、直接に復調信号を導
出し、続いて、LPF3b、4bで高周波、高次成分信
号等を除去し、さらに、低周波増幅回路3C14Cで増
幅された復調信号5QSSiが導出される。In the above configuration, well-known direct conversion is performed, and the oscillation frequency that is substantially the same as that of the high-frequency output signal sb is mixed by the mixers 3a and 4a to directly derive the demodulated signal, and then the demodulated signal is directly derived by the LPFs 3b and 4b. A demodulated signal 5QSSi is derived by removing high-frequency, high-order component signals, etc., and further amplified by a low-frequency amplification circuit 3C14C.
[発明が解決しようとする課題]
しかしながら、上記の従来例に係るダイレクトコンバー
ジョン受信機においては、極めて高い周波数の受信信号
3aが供給されることからミキサ3a、4aの前段にリ
ミッタアンプを配設することができない、あるいは低周
波増幅回路3C14Cからの復調信号Sq、Siの導出
後にもリミッタアンプを設けることができない。[Problem to be Solved by the Invention] However, in the direct conversion receiver according to the above-mentioned conventional example, since the reception signal 3a of an extremely high frequency is supplied, a limiter amplifier is disposed before the mixers 3a and 4a. Or, it is not possible to provide a limiter amplifier even after deriving the demodulated signals Sq and Si from the low frequency amplifier circuit 3C14C.
このため、例えば、移動無線電話機においてはゾーンの
切り換え等に供される高周波出力信号sbのレベル(受
信電界)の検出が困難である。For this reason, for example, in mobile radio telephones, it is difficult to detect the level (received electric field) of the high frequency output signal sb used for zone switching and the like.
この場合、比較的複雑な回路構成であるAGCの導入が
必要となる等々の欠点を有している。In this case, there are drawbacks such as the need to introduce AGC, which has a relatively complicated circuit configuration.
本発明は係る点に鑑みてなされたものであって、比較的
簡単な構成において、受信電界レベルの検出が可能とな
り、且つ受信利得の安定化に優れるダイレクトコンバー
ジョン受信機を提供することを目的とする。The present invention has been made in view of the above points, and an object of the present invention is to provide a direct conversion receiver that can detect the received electric field level with a relatively simple configuration and is excellent in stabilizing the receiving gain. do.
[課題を解決するための手段]
前記の課題を解決するた約に、本発明のダイレクトコン
バージョン受信機は、
受信信号と第1の発振器からの発振信号が供給されて低
周波信号を導出する低周波数変換手段と、
前記低周波信号と第2の発振器からの発振信号が供給さ
れて高周波数のFM信号を送出するFM変換手段と、
前記FM信号が供給されてレベルを示す検出信号と出力
信号を送出するリミッタアンプと、前記出力信号と第3
あるいは前記第2の発振器から前記FM信号と略同一の
発振周波数信号が供給されて低周波の復調信号を導出す
る復調手段と、
を備えることを特徴とする。[Means for Solving the Problems] In order to solve the above-mentioned problems, the direct conversion receiver of the present invention includes a low-frequency converter that is supplied with a received signal and an oscillation signal from a first oscillator and derives a low-frequency signal. Frequency converting means; FM converting means to which the low frequency signal and the oscillation signal from the second oscillator are supplied to send out a high frequency FM signal; and to which the FM signal is supplied, a detection signal and an output signal indicating the level. a limiter amplifier that sends out the output signal and a third
Alternatively, the present invention is characterized by comprising a demodulating means for deriving a low-frequency demodulated signal by receiving an oscillation frequency signal substantially the same as the FM signal from the second oscillator.
[作用]
上記の構成において、供給される受信信号が低周波信号
に変換される。次いで、高周波数のFM信号に変換され
、この後、例えば、リミッタアンプでレベルを示す検出
信号ならびに出力信号が送出される。そして、低周波に
変換されて、復調信号が導出される。これにより、受信
信号のレベル検出(受信電界レベル)が行われ、且つ受
信利得が安定化する。[Operation] In the above configuration, the supplied received signal is converted into a low frequency signal. Next, it is converted into a high frequency FM signal, and then, for example, a limiter amplifier sends out a detection signal indicating the level and an output signal. Then, it is converted to a low frequency and a demodulated signal is derived. As a result, the level of the received signal (received electric field level) is detected and the reception gain is stabilized.
[実施例]
次に、本発明に係るダイレクトコンバージョン受信機の
実施例を、添付図面を参照して以下詳細に説明する。[Example] Next, an example of the direct conversion receiver according to the present invention will be described in detail below with reference to the accompanying drawings.
第1図は実施例の全体構成を示すブロック図である。FIG. 1 is a block diagram showing the overall configuration of the embodiment.
第1図に示される例は、供給される受信信号Seを増幅
する高周波増幅回路11と、ここで導出される増幅受信
信号Sfが供給され、低周波信号Sga、Sgbに変換
して導出する低周波数変換部(低周波数変換手段)12
と、低周波信号Sga、Sgbを高周波数のFM信号S
ia、Sibに変換するFM変換部(FM変換手段)2
4と、FM信号Sia、Sibが供給されてレベルを示
す検出信号Sjならびに出力信号Skを送出するリミッ
タアンプ32と、低周波に変換したtim信号Sma
(Qチャネル)、Smb(Iチャネル)を導出する復調
部(復調手段)34とで概略構成されている。The example shown in FIG. 1 includes a high-frequency amplification circuit 11 that amplifies the supplied received signal Se, and an amplified received signal Sf derived here, which is converted into low-frequency signals Sga, Sgb and derived. Frequency converter (low frequency converter) 12
and the low frequency signals Sga, Sgb are converted into the high frequency FM signal S.
FM conversion unit (FM conversion means) 2 that converts to ia and Sib
4, a limiter amplifier 32 to which the FM signals Sia and Sib are supplied and sends out a detection signal Sj indicating the level and an output signal Sk, and a tim signal Sma converted to a low frequency.
(Q channel) and a demodulation section (demodulation means) 34 that derives Smb (I channel).
低周波数変換部12は高周波増幅回路11で分岐された
受信信号Sfが夫々供給されるとともに、Q/Iチャネ
ル系に弁別されて構成されており、ミキサ14a、14
bと、LPF16a、16bと、局部発振器18と、9
0°移相器20とを有し、続いて、FM変換部24はミ
キサ26a、26bと、局部発振器28と、90°移相
器30とが設けられている。The low frequency converter 12 is configured to be supplied with the received signal Sf branched by the high frequency amplifier circuit 11 and separated into Q/I channel systems, and mixers 14a, 14
b, LPF16a, 16b, local oscillator 18, 9
The FM converter 24 includes a 0° phase shifter 20, and subsequently, the FM converter 24 is provided with mixers 26a and 26b, a local oscillator 28, and a 90° phase shifter 30.
リミッタアンプ32には前記のミキサ26a126bの
出力信号であるFM信号3ia、Sibが合成して供給
される。The limiter amplifier 32 is supplied with the combined FM signals 3ia and Sib, which are the output signals of the mixer 26a126b.
さらに、復調部34はQ/Iチャネル系に弁別されて構
成されており、ミキサ35a、35bと、LPF 35
a、36bと、低周波増幅器38a、38bとを有し
ている。Further, the demodulator 34 is configured to be differentiated into Q/I channel systems, and includes mixers 35a, 35b, and an LPF 35.
a, 36b, and low frequency amplifiers 38a, 38b.
次に、上記のように構成される実施例の動作を説明する
。Next, the operation of the embodiment configured as described above will be explained.
先ず、供給される受信信号Seが高周波増幅回路11で
増幅される。ここで導出される増幅受信信号Sfが分岐
されて、低周波数変換部12のミキサ14a、14bに
供給される。ミキサ14a、14bには、夫々局部発振
器18から増幅受信信号Sfと略同一周波数の局部発振
信号と90°移相器20を介した局部発振信号が供給さ
れ、Q/Iチャネルの復調された低周波信号が導出され
る。この夫々の低周波信号はLPF16a、16bで高
次成分等が除去された低周波信号Sga、Sgbが導出
される。First, the supplied received signal Se is amplified by the high frequency amplification circuit 11. The amplified received signal Sf derived here is branched and supplied to mixers 14a and 14b of the low frequency conversion section 12. The mixers 14a and 14b are supplied with a local oscillation signal having substantially the same frequency as the amplified reception signal Sf from the local oscillator 18 and a local oscillation signal passed through the 90° phase shifter 20, respectively, and are supplied with a demodulated low frequency signal of the Q/I channel. A frequency signal is derived. These respective low frequency signals are subjected to LPFs 16a and 16b, from which high-order components and the like are removed, and low frequency signals Sga and Sgb are derived.
続いて、低周波信号Sga、SgbがFM変換部24の
ミキサ26a、26bに供給される。Subsequently, the low frequency signals Sga and Sgb are supplied to the mixers 26a and 26b of the FM converter 24.
ここで、ミキサ26a、26bには夫々局部発振器28
から数10〜数100KHzの周波数の局部発振信号と
90°移相器30を介した局部発振信号が供給され、Q
/Iチャネルの高周波数のFM信号Sia、Sibが導
出される。Here, the mixers 26a and 26b each have a local oscillator 28.
A local oscillation signal with a frequency of several 10 to several 100 KHz and a local oscillation signal via a 90° phase shifter 30 are supplied from Q.
/I channel high frequency FM signals Sia and Sib are derived.
FM信号5iaSSibはリミッタアンプ32に合成し
て供給される。ここではレベルを示す検出信号Sjなら
びに出力信号Skが導出される。ここで検出信号SJは
FM信号3ia。The FM signal 5iaSSib is combined and supplied to the limiter amplifier 32. Here, a detection signal Sj indicating the level and an output signal Sk are derived. Here, the detection signal SJ is the FM signal 3ia.
S1bのレベル、すなわち、受信信号Seのレベルであ
る。この場合、検出信号Sjは、複数段の増幅器で構成
されるリミッタアンプの場合の後段の増幅器の出力を前
段に帰還する閉ループ制御の制御電圧に相当するもので
ある。This is the level of S1b, that is, the level of the received signal Se. In this case, the detection signal Sj corresponds to a control voltage for closed loop control that feeds back the output of a subsequent stage amplifier to a previous stage in the case of a limiter amplifier composed of multiple stages of amplifiers.
出力信号Skは復調部34のミキサ35a135bに夫
々供給される。ミキサ35a、35bには、前記のFM
変換部24の局部発振器28から数10〜数100KH
zの周波数の局部発振信号と90°移相器30を介した
局部発振信号が同時に供給されており、ここで、Q/I
チャネルの復調された低周波信号が導出される。The output signal Sk is supplied to mixers 35a and 135b of the demodulator 34, respectively. The mixers 35a and 35b have the above-mentioned FM
Several tens to several hundred KH from the local oscillator 28 of the converter 24
A local oscillation signal with a frequency of
A demodulated low frequency signal of the channel is derived.
この夫々の低周波信号はLPF36a、36bでミキサ
35a、35b等で生起した高次成分等を除去した低周
波信号が導出される。この低周波信号は、さらに低周波
増幅器38a、38bで所定の増幅が行われて、復調信
号Sma。These low frequency signals are derived by LPFs 36a and 36b from which high-order components generated by mixers 35a and 35b are removed. This low frequency signal is further amplified in a predetermined manner by low frequency amplifiers 38a and 38b to produce a demodulated signal Sma.
Smbが導出される。Smb is derived.
このようにして、供給される受信信号Se(増幅受信信
号Sf)が低周波信号Sga、Sgbに変換され、次い
で、高周波数のFM信号5iaSSibに変換され、こ
の後、レベルを示す検出信号SJならびに出力信号Sk
が送出される。そして、再び低周波に変換されて、復調
信号SmaSSmbが導出される。これにより、供給さ
れる受信信号Seのレベル検出、すなわち検出信号Sj
導出く受信電界レベル)が行われ、例えば、移動無線電
話機において、ゾーンの切り換えに係る制御が有効に出
来るようになる。さらに復調信号処理における受信利得
が安定する。In this way, the supplied reception signal Se (amplified reception signal Sf) is converted into low frequency signals Sga, Sgb, then converted into a high frequency FM signal 5iaSSib, and then a detection signal SJ indicating the level and Output signal Sk
is sent. Then, it is converted to a low frequency again, and a demodulated signal SmaSSmb is derived. As a result, level detection of the supplied reception signal Se, that is, detection signal Sj
For example, in a mobile radio telephone, zone switching can be effectively controlled. Furthermore, the reception gain in demodulated signal processing is stabilized.
なお、本実施例において、ミキサ14a、14bの以降
における回路構成はデジタル信号処理においても前記同
様の作用効果が得られる。In this embodiment, the circuit configuration after the mixers 14a and 14b provides the same effects as described above in digital signal processing.
この場合、構成回路のIC化が容易であり、装置規模が
低減して小型化され、可搬機器、例えば、ボケットベノ
へ移動無線電話機への適用が容易となる。In this case, the component circuits can be easily integrated into ICs, the scale of the device can be reduced, and the device can be miniaturized, making it easy to apply it to portable equipment, such as mobile radio telephones and mobile radio telephones.
[発明の効果]
以上のように、本発明のダイレクトコンバージョン受信
機によれば、受信信号と第1の発振器からの発振信号が
供給されて低周波信号を導出する低周波数変換手段と、
前記低周波信号と第2の発振器からの発振信号が供給さ
れて高周波数のFM信号を送出するFM変換手段と、前
記FM信号が供給されてレベルを示す検出信号と出力信
号を送出するリミッタアンプと、前記出力信号と第3あ
るいは前記第2の発振器から前記FM信号と略同一の発
振周波数信号が供給されて低周波の復調信号を導出する
復調手段とを備えて構成されることを特徴としている。[Effects of the Invention] As described above, the direct conversion receiver of the present invention includes a low frequency conversion means that is supplied with a received signal and an oscillation signal from the first oscillator and derives a low frequency signal;
FM conversion means that is supplied with the low frequency signal and the oscillation signal from the second oscillator and sends out a high frequency FM signal; and a limiter amplifier that is supplied with the FM signal and sends out a detection signal indicating a level and an output signal. and demodulation means for deriving a low-frequency demodulated signal by receiving the output signal and an oscillation frequency signal substantially the same as the FM signal from the third or second oscillator. There is.
これにより、受信電界レベルの検出が可能となり、且つ
受信利得の安定化が向上する効果を奏する。加えて、構
成回路のIC化が容易となり、装置規模が低減して小型
化されて可搬機器、例えば、ポケットベノへ移動無線電
話機への適用が容易になる利点が有る。This makes it possible to detect the reception electric field level, and has the effect of improving the stabilization of the reception gain. In addition, there is an advantage that the component circuits can be easily integrated into ICs, the scale of the device can be reduced, and the device can be miniaturized, making it easy to apply it to portable devices such as pocket benches and mobile radio telephones.
第1図は本発明に係るダイレクトコンバージョン受信機
の一実施例の全体構成を示すブロック図、
第2図は従来の技術に係るダイレクトコンバージョン受
信機の全体構成を示すブロック図である。
11・・・高周波増幅回路
12・・・低周波数変換部
14a、14b−・・ミキサ
16 a、 16 b・LPF
18・・・局部発振器
20・・・90°移相器
24・・・FM変換部
26a、26b・=ミキサ
28・・・局部発振器
30・・・90°移相器
32・・・リミッタアンプ
34・・・復調部
35a、35b・=・ミキサ
36 a、 36 b・LPF
38a、38b・・・低周波増幅器
Se・・・受信信号
Sf・・・増幅受信信号
SgaSSgb・・・低周波信号
S i a、 S i b・−FM信号SJ・・・検出
信号
Sk・・・出力信号
Sma、Smb・・・復調信号FIG. 1 is a block diagram showing the overall configuration of an embodiment of a direct conversion receiver according to the present invention, and FIG. 2 is a block diagram showing the overall configuration of a direct conversion receiver according to the prior art. 11... High frequency amplification circuit 12... Low frequency conversion section 14a, 14b... Mixer 16 a, 16 b LPF 18... Local oscillator 20... 90° phase shifter 24... FM conversion Parts 26a, 26b = Mixer 28... Local oscillator 30... 90° phase shifter 32... Limiter amplifier 34... Demodulator part 35a, 35b = Mixer 36 a, 36 b, LPF 38a, 38b...Low frequency amplifier Se...Reception signal Sf...Amplified reception signal SgaSSgb...Low frequency signal Sia, Sib-FM signal SJ...Detection signal Sk...Output signal Sma, Smb... demodulated signal
Claims (1)
れて低周波信号を導出する低周波数変換手段と、 前記低周波信号と第2の発振器からの発振信号が供給さ
れて高周波数のFM信号を送出するFM変換手段と、 前記FM信号が供給されてレベルを示す検出信号と出力
信号を送出するリミッタアンプと、前記出力信号と第3
あるいは前記第2の発振器から前記FM信号と略同一の
発振周波数信号が供給されて低周波の復調信号を導出す
る復調手段と、 を備えて構成されるダイレクトコンバージョン受信機。(1) A low frequency conversion means that is supplied with a received signal and an oscillation signal from a first oscillator and derives a low frequency signal; FM converting means for sending out an FM signal; a limiter amplifier to which the FM signal is supplied and sending out a detection signal indicating the level and an output signal;
Alternatively, a direct conversion receiver comprising: demodulation means that is supplied with an oscillation frequency signal substantially the same as the FM signal from the second oscillator and derives a low-frequency demodulated signal.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2023556A JPH03227137A (en) | 1990-01-31 | 1990-01-31 | Direct conversion receiver |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2023556A JPH03227137A (en) | 1990-01-31 | 1990-01-31 | Direct conversion receiver |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH03227137A true JPH03227137A (en) | 1991-10-08 |
Family
ID=12113781
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2023556A Pending JPH03227137A (en) | 1990-01-31 | 1990-01-31 | Direct conversion receiver |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH03227137A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5867062A (en) * | 1996-11-20 | 1999-02-02 | Nec Corporation | DC-offset canceler circuit and differential amplifier circuit equipped therewith |
-
1990
- 1990-01-31 JP JP2023556A patent/JPH03227137A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5867062A (en) * | 1996-11-20 | 1999-02-02 | Nec Corporation | DC-offset canceler circuit and differential amplifier circuit equipped therewith |
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