JPH01198808A - Frequency mixer - Google Patents

Frequency mixer

Info

Publication number
JPH01198808A
JPH01198808A JP2438888A JP2438888A JPH01198808A JP H01198808 A JPH01198808 A JP H01198808A JP 2438888 A JP2438888 A JP 2438888A JP 2438888 A JP2438888 A JP 2438888A JP H01198808 A JPH01198808 A JP H01198808A
Authority
JP
Japan
Prior art keywords
resistor
intermediate frequency
frequency
output terminal
circuit
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
Application number
JP2438888A
Other languages
Japanese (ja)
Inventor
Keiichi Sakuno
圭一 作野
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sharp Corp
Original Assignee
Sharp Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Sharp Corp filed Critical Sharp Corp
Priority to JP2438888A priority Critical patent/JPH01198808A/en
Publication of JPH01198808A publication Critical patent/JPH01198808A/en
Pending legal-status Critical Current

Links

Landscapes

  • Superheterodyne Receivers (AREA)

Abstract

PURPOSE:To attain the operation with one power supply in common to that of other semiconductor and to attain small size of the circuit by providing a resistor connected to ground via a DC block capacitor between an output terminal of a mixer and an intermediate frequency output terminal of a frequency mixing FET element. CONSTITUTION:A resistor 9 connected to ground via a DC block capacitor 6 is inserted between an output terminal B of a frequency mixer and an intermediate frequency output terminal A of a frequency mixing FET1 in parallel with a bias resistor 5 in terms of high frequencies. Then the value of an impedance matching resistor 9 is selected to a proper value with respect to a bias resistor 5 decided by a drive voltage Vdd of an intermediate frequency amplifier 10. Thus, the impedance matching with the intermediate frequency amplifier 10 and one power supply operation with other semiconductor are realized simultaneously and the circuit size is made small by the reduced power circuit.

Description

【発明の詳細な説明】 〈産業上の利用分野〉 本発明は、周波数混合素子としてFETを用いた、例え
ばマイクロ波帯の信号を扱う周波数混合器に関するもの
である。
DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a frequency mixer that uses a FET as a frequency mixing element and handles signals in the microwave band, for example.

ムアナライザ等の幅広い用途があるが、FETを周波数
混合素子として用いた周波数混合器も、FETのゲート
・ドレイン間のアイソレーシッン効果を利用してフィル
タ系を簡単に出来ることや、増幅作用を有する等の特徴
を生かした開発が進められており、例えばマイクロ波帯
の信号を扱う衛星通信受信器等にも用いられつつある。
Frequency mixers that use FETs as frequency mixing elements also have a wide range of uses, such as frequency mixers that use FETs as frequency mixing elements. Development is progressing to take advantage of the characteristics of this technology, and it is being used, for example, in satellite communication receivers that handle microwave band signals.

第3図は従来のFET周波数混合器の構成例を示す回路
図であり、第3図において、21はドレイン電圧供給端
子に挿入されたRFチ曹−クコイル、22は次段の中間
周波増幅器28との中間周波数帯整合回路であり、コイ
ル221.コンデンサ222,223より構成されてい
る。また、23は直流信号阻止用コンデンサ、24はR
F信号入力整合回路、25は局部発振器からのローカル
信号入力整合回路であシ、点Aは周波数混合を生じせし
めるFET27の中間周波数信号出力端、点Bは周波数
混合器の中間周波数信号出力端、VddはFET7のド
レインバイアス電源、V’dd は中間周波数増幅器2
8の電源電圧、G、D、SはそれぞれFET7のゲート
、ドレイン、ソース端子を表わしている。
FIG. 3 is a circuit diagram showing an example of the configuration of a conventional FET frequency mixer, and in FIG. It is an intermediate frequency band matching circuit with coils 221. It is composed of capacitors 222 and 223. In addition, 23 is a DC signal blocking capacitor, 24 is R
F signal input matching circuit, 25 is a local signal input matching circuit from the local oscillator, point A is the intermediate frequency signal output terminal of FET 27 that causes frequency mixing, point B is the intermediate frequency signal output terminal of the frequency mixer, Vdd is the drain bias power supply of FET7, V'dd is the intermediate frequency amplifier 2
The power supply voltages 8, G, D, and S represent the gate, drain, and source terminals of the FET 7, respectively.

一方、通常中間周波数はRF倍信号ローカル信号の周波
数に比してかなり低く、上記した従来の回路のRFチョ
ークコイル21及び、中間周波数帯整合回路22中に含
まれるコイル221が大面積を占めることになり、従来
、回路を小型化する際の大きな問題点となっていた。
On the other hand, the intermediate frequency is usually considerably lower than the frequency of the RF multiplied signal local signal, and the RF choke coil 21 of the above-described conventional circuit and the coil 221 included in the intermediate frequency band matching circuit 22 occupy a large area. This has traditionally been a major problem when miniaturizing circuits.

第4図は上記した問題点を解決するために提案された従
来の回路構成を示す図であり、第3図と同一部分は同一
符号で示しており、FET27のドレインバイアス抵抗
29 (R1)に次段の中間周波数増幅器28とのイン
ピーダンス整合の役割を兼ねるように成して、第3図中
のコイルを除去し、回路の小型化を図るようにしたもの
である。なお、第4図において、26はローカル信号除
去用終端開放伝送線路、30はバイパスコンデンサであ
る。
FIG. 4 is a diagram showing a conventional circuit configuration proposed to solve the above-mentioned problems. The same parts as in FIG. It also serves as impedance matching with the intermediate frequency amplifier 28 at the next stage, and the coil shown in FIG. 3 is removed to reduce the size of the circuit. In FIG. 4, 26 is an open-terminated transmission line for local signal removal, and 30 is a bypass capacitor.

〈発明が解決しようとする問題点〉 しかしながら、上記第4図に示した従来の周波数混合器
にあっては、抵抗29の値(R1)は周波数混合器の出
力インピーダンスと中間周波数増幅器28との入力イン
ピーダンスとを整合させるために、大きな制約を受け、
他の半導体装置(例えば第4図中の中間周波数増幅器2
8)と一つの電源で動作させることが困難になる場合が
あった。
<Problems to be Solved by the Invention> However, in the conventional frequency mixer shown in FIG. In order to match the input impedance, there are major restrictions,
Other semiconductor devices (for example, intermediate frequency amplifier 2 in FIG. 4)
8) It was sometimes difficult to operate with a single power supply.

本発明は上記の点に鑑みて創案されたものであシ、上記
従来の問題点を除去した新規な周波数混合器を提供する
ことを目的としている。
The present invention was devised in view of the above points, and an object of the present invention is to provide a novel frequency mixer that eliminates the above conventional problems.

く問題点を解決するための手段〉 上記の目的を達成するため、本発明は入力信号と局部発
振信号から中間周波数信号を生成する周波数混合FET
素子を有する周波数混合器において、上記の周波数混合
FET素子の中間周波数出力端と混合器の出力端との間
に直流阻止用コンデンサを介して接地された抵抗を設け
てなるように構成している。
Means for Solving the Problems In order to achieve the above object, the present invention provides a frequency mixing FET that generates an intermediate frequency signal from an input signal and a local oscillation signal.
In a frequency mixer having a frequency mixing element, a resistor is provided between the intermediate frequency output terminal of the frequency mixing FET element and the output terminal of the mixer, and is grounded via a DC blocking capacitor. .

即ち、本発明の周波数混合器は、第4図に示した回路中
のバイアス抵抗(R+)と高周波的に並列に、周波数混
合器の中間周波数出力端Bと周波数混合を生じせしめる
FETの中間周波数出力端Aの間に直流阻止コンデンサ
を介して接地された抵抗(R2)を挿入したことを特徴
としている。
That is, the frequency mixer of the present invention has an intermediate frequency output terminal B of the frequency mixer in parallel with the bias resistor (R+) in the circuit shown in FIG. It is characterized in that a grounded resistor (R2) is inserted between the output terminal A via a DC blocking capacitor.

く作 用〉 上記のような構成によると、抵抗(Rr + R2)の
並列抵抗値が次段の中間周波増幅器との整合状態を決定
するため、電源電圧Vddによって制限されたバイアス
抵抗(R1)だけでは良好なインピーダンス整合が得ら
れない場合でも、抵抗(R2)を適当な値に選ぶことに
より、次段との整合をとることが可能となる。したがっ
て、他の半導体装置(例えば、次段の中間周波増幅器)
の駆動電圧V’ddに対し、FETが適切な動作点にな
るようなバイアス抵抗(R+)を決定し、その後に、抵
抗(R2)を適当な値に設定して次段との整合をとるよ
うにすることにより、他の半導体装置と同一電源で動作
させることができ、回路が小型化される。
According to the above configuration, the parallel resistance value of the resistor (Rr + R2) determines the matching state with the next stage intermediate frequency amplifier, so the bias resistor (R1) limited by the power supply voltage Vdd Even if good impedance matching cannot be obtained by using only the resistor (R2), matching with the next stage can be achieved by selecting an appropriate value for the resistor (R2). Therefore, other semiconductor devices (for example, the next stage intermediate frequency amplifier)
Determine the bias resistor (R+) that will bring the FET to an appropriate operating point for the drive voltage V'dd, and then set the resistor (R2) to an appropriate value to match with the next stage. By doing so, it can be operated with the same power supply as other semiconductor devices, and the circuit can be miniaturized.

〈実施例、〉 以下、図面を参照して本発明の実施例について、詳細に
説明する。
<Examples> Hereinafter, examples of the present invention will be described in detail with reference to the drawings.

第1図は、本発明の一実施例における回路図である。FIG. 1 is a circuit diagram in one embodiment of the present invention.

第1図において、1は周波数混合FET素子であシ、こ
のFET1のゲート(G)はRF信号入力整合回路2を
介して入力される入力信号(RF倍信号の入力端に接続
され、ソース(S)はローカル信号入力整合回路3を介
して入力される局部発振信号(ローカル信号)の入力端
に接続され、ドレイン(D)はローカル信号除去用終端
開放伝送線路の一端に接続されると共にドレインバイア
ス抵抗5 (R1)の一端に接続され、更に周波数混合
を生じせしめるFETIの中間周波数信号出力端Aとし
て直流信号阻止用コンデンサ6及び7を介して周波数混
合器の中間周波数信号出力端Bに接続されている。また
上記のドレインバイアス抵抗5の他端はバイパスコンデ
ンサ8を介して接地されると共にFETIのドレインバ
イアス電圧源Vddに接続されている。また上記した直
流信号阻止用コンデンサ6及び7の接続中点は抵抗9(
R2)を介して接地されておシ、更に上記出力端BはI
F倍信号出力する次段の中間周波増幅器10の入力端に
接続され、この増幅器10はFETIの電圧源と共通の
電圧源Vddに接続されている。
In FIG. 1, 1 is a frequency mixing FET element, the gate (G) of this FET 1 is connected to the input terminal of the input signal (RF multiplied signal) inputted via the RF signal input matching circuit 2, and the source ( S) is connected to the input end of the local oscillation signal (local signal) inputted via the local signal input matching circuit 3, and the drain (D) is connected to one end of the open-terminated transmission line for local signal removal, and the drain It is connected to one end of the bias resistor 5 (R1), and is further connected to the intermediate frequency signal output terminal B of the frequency mixer via the DC signal blocking capacitors 6 and 7 as the intermediate frequency signal output terminal A of the FETI that causes frequency mixing. The other end of the drain bias resistor 5 is grounded via a bypass capacitor 8 and also connected to the drain bias voltage source Vdd of the FETI. The connection midpoint is resistor 9 (
R2), and the above output terminal B is connected to I.
It is connected to the input terminal of an intermediate frequency amplifier 10 in the next stage that outputs an F-fold signal, and this amplifier 10 is connected to a voltage source Vdd common to the voltage source of the FETI.

上記のような回路構成において、直流阻止用コンデンサ
6を介して接地された抵抗9(R2)を設けた点が本発
明の特徴であり、この第1図に示す例は次段の中間周波
数増幅器10と一つの電源で動作させる場合であり、中
間周波数増幅器10の駆動電圧Vddによって決定され
るバイアス抵抗5の値(R1)に対し、インピーダンス
整合用抵抗9の値(R2)を適当な値に選ぶことによっ
て、中間周波数増幅器10とのインピーダンス整合と、
−電源動作が同時に実現され、また電源回路が少なくな
る分だけ回路が小型化される。
In the above circuit configuration, the present invention is characterized by the provision of a resistor 9 (R2) that is grounded via the DC blocking capacitor 6, and the example shown in FIG. In this case, the value of the impedance matching resistor 9 (R2) is set to an appropriate value for the value of the bias resistor 5 (R1) determined by the drive voltage Vdd of the intermediate frequency amplifier 10. By selecting impedance matching with the intermediate frequency amplifier 10,
- Power supply operations are realized at the same time, and the circuit is miniaturized as the number of power supply circuits is reduced.

第2図は本発明の他の実施例の回路構成を示す図であり
、第1図と同一部分は同一符号で示しており、第1図に
おけるインピーダンス整合用抵抗9 (R2)と直流阻
止用コンデンサ6の接続関係を、第2図に示すように出
力端Aを抵抗9とコンデンサ6の直列接続体を介して接
地するように構成したものであり、この第2図に示すよ
うに構成した場合にも、第1図に示した回路構成の場合
と同様の作用効果を奏することになる。
FIG. 2 is a diagram showing the circuit configuration of another embodiment of the present invention, in which the same parts as in FIG. The connection relationship of the capacitor 6 is configured such that the output terminal A is grounded via a series connection of the resistor 9 and the capacitor 6, as shown in FIG. 2. In this case, the same effects as in the case of the circuit configuration shown in FIG. 1 can be obtained.

なお、上記実施例においては、周波数混合部のFETは
シングルゲートの場合を例にとって説明したが、本発明
はこれに限定されるものではなく、例えばデュアルゲー
)FET等の多重ゲー) FETを周波数混合素子とし
て用いた場合にも、同様に実施することが出来ることは
言うまでもない。
In the above embodiment, the FET in the frequency mixing section is a single gate, but the present invention is not limited to this. It goes without saying that similar implementations can be made when used as a mixing element.

〈発明の効果〉 以上のように本発明によれば、周波数混合器の中間周波
出力部のインピーダンス整合及び他の半導体装置との一
電源動作を同時に達成することが出来、その結果、周波
数混合器の小型化を実現することが出来る。
<Effects of the Invention> As described above, according to the present invention, impedance matching of the intermediate frequency output section of the frequency mixer and single power supply operation with other semiconductor devices can be simultaneously achieved, and as a result, the frequency mixer It is possible to realize miniaturization of the size.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は本発明の一実施例の周波数混合器の回路構成を
示す図、第2図は本発明の他の実施例の周波数混合器の
回路構成を示す図、第3図及び第4図はそれぞれ従来例
の回路構成例を示す図である0 1・・・周波数混合用FET、2・・・RF信号入力整
合回路、3・・・ローカル信号入力整合回路、4・・・
ローカル信号除去用終端開放伝送線路、5・・・ドレイ
ンバイアス抵抗(R1)、6・・・直流阻止用コンデン
サ、7・・・直流信号阻止コンデンサ、8・・・バイパ
スコンデンサ、10・・・中間周波数増幅器、Vdd・
・・FET1のドレインバイアス源電圧。 代理人 弁理士 杉 山 毅 至(他1名)Vdd α−zrv41 妃!図 第22
FIG. 1 is a diagram showing the circuit configuration of a frequency mixer according to one embodiment of the present invention, FIG. 2 is a diagram showing the circuit configuration of a frequency mixer according to another embodiment of the present invention, and FIGS. 3 and 4 are diagrams showing examples of conventional circuit configurations, respectively. 0 1... Frequency mixing FET, 2... RF signal input matching circuit, 3... Local signal input matching circuit, 4...
Open-terminated transmission line for local signal removal, 5...Drain bias resistor (R1), 6...DC blocking capacitor, 7...DC signal blocking capacitor, 8...Bypass capacitor, 10...Intermediate Frequency amplifier, Vdd・
...Drain bias source voltage of FET1. Agent Patent Attorney Takeshi Sugiyama (and 1 other person) Vdd α-zrv41 Princess! Figure 22

Claims (1)

【特許請求の範囲】 1、入力信号と局部発振信号から中間周波数信号を生成
する周波数混合FET素子を有する周波数混合器におい
て、 上記周波数混合FET素子の中間周波数出力端と混合器
の出力端との間に直流阻止用コンデンサを介して接地さ
れた抵抗を設けてなることを特徴とする周波数混合器。
[Claims] 1. In a frequency mixer having a frequency mixing FET element that generates an intermediate frequency signal from an input signal and a local oscillation signal, a connection between the intermediate frequency output terminal of the frequency mixing FET element and the output terminal of the mixer. A frequency mixer comprising a resistor that is grounded through a DC blocking capacitor in between.
JP2438888A 1988-02-03 1988-02-03 Frequency mixer Pending JPH01198808A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2438888A JPH01198808A (en) 1988-02-03 1988-02-03 Frequency mixer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2438888A JPH01198808A (en) 1988-02-03 1988-02-03 Frequency mixer

Publications (1)

Publication Number Publication Date
JPH01198808A true JPH01198808A (en) 1989-08-10

Family

ID=12136782

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2438888A Pending JPH01198808A (en) 1988-02-03 1988-02-03 Frequency mixer

Country Status (1)

Country Link
JP (1) JPH01198808A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0546112U (en) * 1991-11-13 1993-06-18 アルプス電気株式会社 IC for tuner and IC chip for tuner
JPH0774546A (en) * 1993-09-03 1995-03-17 Nec Corp Mixer circuit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0546112U (en) * 1991-11-13 1993-06-18 アルプス電気株式会社 IC for tuner and IC chip for tuner
JPH0774546A (en) * 1993-09-03 1995-03-17 Nec Corp Mixer circuit

Similar Documents

Publication Publication Date Title
US6871059B1 (en) Passive balun FET mixer
EP1187310A2 (en) Gilbert-cell Mixer
US4912520A (en) Mixer circuit for use in a tuner of a television set or the like
JPH0452642B2 (en)
US5732345A (en) Quasi-double balanced dual-transformer dual FET mixer, which achieves better isolation by using a first and second diplexer, and a transmission line RF balun
JPS62110306A (en) Microwave receiver
US6665528B2 (en) Dual band fet mixer
JPH01198808A (en) Frequency mixer
JP3098195B2 (en) Active quadrature power divider
EP0940014A1 (en) Method and apparatus for mixing signals
JP2910421B2 (en) Microwave oscillator
JP3350639B2 (en) Frequency converter
US6163689A (en) Negative self-bias circuit for FET mixers
JP2002529949A (en) Combined low power CFCMOS mixer and VCO reusing current
JPH0246011A (en) High frequency/high output mixing integrated circuit
JPH02198207A (en) Single balanced mixer circuit
JPH118515A (en) Frequency conversion device
JP3159381B2 (en) Received signal switching device for satellite broadcast receiving converter
JPH0718190Y2 (en) Tuner circuit
JPH08316737A (en) Mixer circuit
KR100204597B1 (en) Frequency mixer structure
JP2769157B2 (en) Divider
JPH05343918A (en) Voltage controlled oscillator
JPH0748667B2 (en) Front-end circuit
JPS6272207A (en) Oscillation circuit