JPS58156232A - Am/fm radio receiver - Google Patents
Am/fm radio receiverInfo
- Publication number
- JPS58156232A JPS58156232A JP3803082A JP3803082A JPS58156232A JP S58156232 A JPS58156232 A JP S58156232A JP 3803082 A JP3803082 A JP 3803082A JP 3803082 A JP3803082 A JP 3803082A JP S58156232 A JPS58156232 A JP S58156232A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- cfb
- intermediate frequency
- terminal
- radio receiver
- 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
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
- H03D5/00—Circuits for demodulating amplitude-modulated or angle-modulated oscillations at will
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Circuits Of Receivers In General (AREA)
Abstract
Description
【発明の詳細な説明】
本発明はワンパッケージの半導体集積回路化に好遍なＡ
Ｍ／ＦＭラジオ受信機に関する。[Detailed Description of the Invention] The present invention is an A
Regarding M/FM radio receiver.
ＡＭ／ＦＭラジオ受信機等は、ワンパッケージの半導体
集積回路に構成されるようになりつつある◎このような
複合機能を有する半導体集積回路（以下においてＩＣと
いう。）で、最も間ＩＮＫなるのは、外部接続端子が増
加してコスト高になることである。AM/FM radio receivers, etc. are increasingly being constructed as one-package semiconductor integrated circuits. ◎ Among these semiconductor integrated circuits (hereinafter referred to as ICs) with multiple functions, the most common INK is The problem is that the number of external connection terminals increases, which increases the cost.
例えば、従来のＡＭ／ＦＭラジオ受信機に第１図に示す
ように構成されたものがある。For example, some conventional AM/FM radio receivers are configured as shown in FIG.
ＦＭ受信時において、１番端子には１０．７ＭＨｚの中
間周波信号が供給され、ＩＣ内のＦＭ用中間ｊＩＩＩ波
増幅回路（以下においてＩＦＡＭＰという。）ＩＫよっ
て増幅される。その出力信号は、゛２番端子を介してセ
ラミックフィルタ（以下においてＣＦという。）Ａに供
給され、ｒ波された中間周波信号は３番端子、スイッチ
ＳＷ１を介して増幅回路２に供給される。During FM reception, a 10.7 MHz intermediate frequency signal is supplied to the No. 1 terminal, and is amplified by an FM intermediate JIII wave amplification circuit (hereinafter referred to as IFAMP) IK within the IC. The output signal is supplied to the ceramic filter (hereinafter referred to as CF) A via the No. 2 terminal, and the r-wave intermediate frequency signal is supplied to the amplifier circuit 2 via the No. 3 terminal and the switch SW1. .
一方、ＡＭ受信時においては、４誉端子から４５５ＫＨ
ｚの中間周波信号が供給され、ＡＭ用中関周腋増輻回路
（以下において、ＩＦＡＭＰという。）３によって増幅
される。そしてＩＦＡＭＰ３の出力信号は、５１１端子
からセラミックフィルタ（以下においてＯＦという。）
によってｆ波され、６番端子、スイッチＳＷ、ｖ介して
増幅回路２へ供給される。On the other hand, when receiving AM, 455KH is received from the 4 Homare terminal.
An intermediate frequency signal of z is supplied and amplified by an AM intermediate frequency axillary amplification circuit (hereinafter referred to as IFAMP) 3. The output signal of IFAMP3 is then passed through a ceramic filter (hereinafter referred to as OF) from the 511 terminal.
The signal is converted into an f-wave and supplied to the amplifier circuit 2 via the No. 6 terminal, switches SW, and v.
スイッチＳＷ、の可動接点Ｃは、ＦＭ受信時において固
定接点ａに切換えられ、ＡＭ受信時において固定接点す
に切換えられる。そしてＦＭ受信時には、ＦＭ検波器４
から検波出力が得られ、７番端子から後段の低周波増幅
器（図示せず）へ供給される。またＡＭ受信時において
は、キ、 ＩＪアレベル検波器５から検波出力が得られ
、８番端子から低周波増幅器へ供給される。なおキ、
ＩＪアレベル検波器５の出力信号は、バッフ丁アンプ６
、抵抗Ｒｏ ＜介して９番端子へ出力され、コンデンサ
Ｃｏ Ｋよって直流化される。このＡＭ／ＦＭキャリア
レベル出力は、例えばＡＧＣ動作を行うための制御信号
として使用される。なおスイッチＳＷ１は、機械的構造
に図示されているが、実ＷＩＡＫはアナログスイッチ等
の電子式スイッチが使用されている。The movable contact C of the switch SW is switched to the fixed contact a when receiving FM, and is switched to the fixed contact when receiving AM. And when receiving FM, FM detector 4
A detection output is obtained from the 7th terminal and is supplied to a subsequent low frequency amplifier (not shown). Further, during AM reception, a detection output is obtained from the K and IJ level detector 5, and is supplied from the No. 8 terminal to the low frequency amplifier. Naoki,
The output signal of the IJ level detector 5 is sent to the buffer amplifier 6.
, is outputted to terminal No. 9 through a resistor Ro, and converted into a direct current by a capacitor CoK. This AM/FM carrier level output is used as a control signal for performing AGC operation, for example. Although the switch SW1 is shown as having a mechanical structure, the actual WIAK uses an electronic switch such as an analog switch.
ところで、上述の如き構成のＡＭ／ＦＭラジオ受信機で
は、二つのセラミックフィルタＣＦＡ。By the way, in the AM/FM radio receiver configured as described above, two ceramic filters CFA are used.
ＣＦＢをＩＣ外に接続する必要があるため、２香。Because it is necessary to connect CFB outside the IC, there are two.
３＠、５番、６番端子と、４個の外部接続端子が使用さ
れる。これはＡＭ／ＦＭの中間周波信号は、それぞれ個
別の信号経路を介して伝達する、という固定観念にとら
れれた方法であり、このためにはスイッチＳＷＩ も必
要不可欠の回路になる。しかし本願発明ｔＫよる検討の
結果、セラミックフィルタＣＦＡ、ＣＦＢの接続用端子
を制限でき、スイッチＳＷ、も不ｌ！托し得ることが明
らかに、なった。Four external connection terminals are used: terminals 3@, 5, and 6. This method is based on the fixed idea that AM/FM intermediate frequency signals are transmitted through separate signal paths, and the switch SWI is also an essential circuit for this purpose. However, as a result of the study by the present invention tK, the connection terminals of the ceramic filters CFA and CFB can be limited, and the switch SW can also be used! It became clear that it was possible.
依って本発明の目的とするところは、簡単な回路構成で
外部接続用端子を制限し得る半導体集積回路化されたＡ
Ｍ／ＦＭラジオ受信機Ｖ提供することである。Therefore, the object of the present invention is to provide a semiconductor integrated circuit A that can limit the number of external connection terminals with a simple circuit configuration.
M/FM radio receiver V is provided.
以下、本発明を運用したＡＭ／ＦＭラジオ受信機の一実
施例を説明する。なお第２図（Ａ）は基本的な回路構成
を示し、第２図（Ｂ）はＦＭ受信時の回路動作を示すも
のであり、第２図（Ｃ）はＡＭ受信時の＠路動作を示す
ものである。更に従来例と同様の回路動作を示す各回路
ブロックには同一の符号を付し、その説明を省略する。An embodiment of an AM/FM radio receiver implementing the present invention will be described below. Figure 2 (A) shows the basic circuit configuration, Figure 2 (B) shows the circuit operation when receiving FM, and Figure 2 (C) shows the operation when receiving AM. It shows. Further, each circuit block showing a circuit operation similar to that of the conventional example is given the same reference numeral, and a description thereof will be omitted.
セラミックフィルタＣＦＡ、ＣＦＢの特性についてみる
と、ＦＭ用のＣＦＡは、ＡＭ中間周波数４５！５ＫＨｚ
に対してはほぼ２０ＰＦＤ程度のコンデンサとして動作
することが明らかになったうｆたＡＭ用のＣＦＢ）’！
、ＦＭ中Ｍ１周ａｌａ １０．７ＭＨｚ Ｋ′対しては
は［２００ＰＦＤ程度のコンデンサとして動作すること
が明らかになった。従って第２図（５）に示す回路は、
ＦＭ受信時においては菖２図ＣＢ）の如き回＃ｌ！構成
にな９、ＡＭ受信時においては第２図（Ｃ）の如き回路
構成になる。そしてＣＦＢの出力端と３番端子との間に
抵抗Ｒ４が設けられ、スイッチＳＷＩが不要になってい
る。このため従来例にみられた６番端子が制限され、回
路構成が簡単になる。上述の回路構成は、以下に述べる
如きインピーダンスの設定によって可能になる。Looking at the characteristics of ceramic filters CFA and CFB, FM CFA has an AM intermediate frequency of 45!5KHz.
It has been revealed that it operates as a capacitor of approximately 20PFD for Ufta AM CFB)'!
, it has been revealed that it operates as a capacitor of about 200 PFD for M1 frequency ala 10.7 MHz K' in FM. Therefore, the circuit shown in FIG. 2 (5) is
When receiving FM, the episode #l is as shown in Iris 2 CB)! The circuit configuration is as shown in FIG. 2(C) during AM reception. A resistor R4 is provided between the output end of CFB and the third terminal, making the switch SWI unnecessary. Therefore, the number 6 terminal seen in the conventional example is limited, and the circuit configuration is simplified. The above circuit configuration is made possible by setting the impedance as described below.
すなわち、ＦＭ受信時におけるＣＦＢのインピーダンス
なＺ、 、ＡＭ受信時におけるＣＦＡのインピーダンス
ｔ’ Ｚ ｔ とする・また増＠Ｉ＋２の入力インピー
ダンスなＲ１とする。That is, let Z be the impedance of the CFB during FM reception, t' Z t be the impedance of the CFA during AM reception, and R1 be the input impedance of increased @I+2.
そして抵抗Ｒ，の抵抗値を、Ｒ１−ＩＺＩＩＫ設定する
。ｆた入力インピーダンスＲ１を、Ｒ３−１Ｚｔ ｌ
−Ｒ＋ トＹＺｓ。上１ｅｃＦＡ、ＣＦＢの容量値から
、Ｒ，−２，６７Ｋｆｌ Ｒ，−３３Ｏｎ１２．１−３
３０” ｌ Ｚｔ ｌ −３Ｋｊ’１Ｋｒｊ ６ｔｓ
各回路定働を上述の如く設定することによって、ＦＭ受
信時ではＣＦＡから出力された中間周波信号が、ｌＦＡ
ＭＰ３に干渉されることなく増幅器２へ供給される。ｌ
たＡＭ受信時では、ＣＦＢから出力される中間周波信号
が、ｌＦＡＭＰ ｌに干渉されることなく増１１１）２
へ供給される。故に従来例にみられる如き、ＡＭ／ＦＭ
信号切換えのためのスイッチＳＷ、ｔ／設ける必要がな
く、回路構成が簡単になる。Then, the resistance value of the resistor R is set to R1-IZIIK. f input impedance R1, R3-1Zt l
-R+ YZs. From the capacitance values of upper 1ecFA and CFB, R, -2,67Kfl R, -33On12.1-3
30" l Zt l -3Kj'1Krj 6ts
By setting the constant operation of each circuit as described above, during FM reception, the intermediate frequency signal output from the CFA is
The signal is supplied to the amplifier 2 without being interfered with by MP3. l
During AM reception, the intermediate frequency signal output from CFB is increased without being interfered with by lFAMP l.
supplied to Therefore, as seen in the conventional example, AM/FM
There is no need to provide switches SW, t/ for signal switching, and the circuit configuration becomes simple.
本発明は上述の如く、ＡＭ／ＦＭラジオ受信機における
セラミックフィルタの特性を利用することによって、Ａ
Ｍ／ＦＭ信号の信号経ｊ８を切換えるスイッチが不畳に
なり、このため回路構成が簡単になる。また半導体集積
回路化した場合、外部接続用端子を制限することができ
るので、生産コストな低減させることができる。As described above, the present invention utilizes the characteristics of ceramic filters in AM/FM radio receivers to achieve
The switch for switching the signal path j8 of the M/FM signal is disabled, which simplifies the circuit configuration. Furthermore, when a semiconductor integrated circuit is formed, the number of external connection terminals can be limited, so production costs can be reduced.
第１図は従来のＡＭ／ＦＭラジオ受信機の中間８＃１回
路を示す回路図、第２図（Ａ）は本発明連用したＡＭ／
ＦＭラジオ受信機の申閾Ｉ！１ｒＩＬ増幅回路時の回路
動作を示すための回路図である。
ｌＣ・・・牛導体集積回路、ＣＦＡ、ＣＦＢ・・・セラ
ミックフィルタ、Ｒ３・・・抵抗、ＺＩ・・・ＣＦＡの
インピーダンス、Ｚ、・・・ＣＦＨのインピーダンス、
ｌ・・・ＦＭ用中間ＪＩｌａｔＩ＃ｌ１１１回路、２・
４Ｍ吊用中１５波増幅０ＡＩＩ、 ３・・・ＡＭ／ＦＭ
中間周波増幅回路、ＳＷｌ・・・スイッチ、４・・・Ｆ
Ｍ４１１ｇ回路、５・・・キ今リアレベル検出回路。
第 １ 図Figure 1 is a circuit diagram showing the intermediate 8#1 circuit of a conventional AM/FM radio receiver, and Figure 2 (A) is an AM/FM radio receiver using the present invention.
FM radio receiver threshold I! FIG. 3 is a circuit diagram showing the circuit operation at the time of a 1rIL amplifier circuit. lC...Conductor integrated circuit, CFA, CFB...Ceramic filter, R3...Resistor, ZI...CFA impedance, Z,...CFH impedance,
l...Intermediate JIlatI#l111 circuit for FM, 2.
4M hanging medium 15 wave amplification 0AII, 3...AM/FM
Intermediate frequency amplifier circuit, SWl...switch, 4...F
M411g circuit, 5... key rear level detection circuit. Figure 1
Claims (1)
間周波信号伝運ｅ路のインピーダンスとを不整合にする
抵抗を介して上記各信号経路の出力端を接続し、ＡＭ中
間周波信号とＦＭ中間周波信号とが同一信号経路によっ
て次段の増幅回路に伝達されるようにしたことｖ４Ｉ像
とするＡＭ／ＦＭラジオ受信機。The output ends of each of the above signal paths are connected through a resistor that makes the impedance of the AM intermediate frequency signal transmission path mismatched with the impedance of the FM intermediate frequency signal transmission path, and the AM intermediate frequency signal and the FM intermediate frequency signal are An AM/FM radio receiver based on the v4I model, in which signals are transmitted to the next stage amplifier circuit through the same signal path.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3803082A JPS58156232A (en) | 1982-03-12 | 1982-03-12 | Am/fm radio receiver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3803082A JPS58156232A (en) | 1982-03-12 | 1982-03-12 | Am/fm radio receiver |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS58156232A true JPS58156232A (en) | 1983-09-17 |
Family
ID=12514152
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3803082A Pending JPS58156232A (en) | 1982-03-12 | 1982-03-12 | Am/fm radio receiver |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58156232A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6178230A (en) * | 1984-09-26 | 1986-04-21 | Nec Corp | Integrated am/fm switching circuit |
-
1982
- 1982-03-12 JP JP3803082A patent/JPS58156232A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6178230A (en) * | 1984-09-26 | 1986-04-21 | Nec Corp | Integrated am/fm switching circuit |
| JPH0438167B2 (en) * | 1984-09-26 | 1992-06-23 | Nippon Electric Co |
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