JPH0257628U - - Google Patents
Info
- Publication number
- JPH0257628U JPH0257628U JP13622288U JP13622288U JPH0257628U JP H0257628 U JPH0257628 U JP H0257628U JP 13622288 U JP13622288 U JP 13622288U JP 13622288 U JP13622288 U JP 13622288U JP H0257628 U JPH0257628 U JP H0257628U
- Authority
- JP
- Japan
- Prior art keywords
- output terminal
- signal
- switching
- count buffer
- buffer 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.)
- Granted
Links
- 239000003990 capacitor Substances 0.000 claims description 2
- 230000003321 amplification Effects 0.000 claims 2
- 238000003199 nucleic acid amplification method Methods 0.000 claims 2
- 238000010586 diagram Methods 0.000 description 3
Landscapes
- Channel Selection Circuits, Automatic Tuning Circuits (AREA)
- Superheterodyne Receivers (AREA)
Description
第１図は、本考案の一実施例を示す回路図、第
２図は従来のカウントバツフア回路を示す回路図
、及び第３図は本考案の具体回路例を示す回路図
である。
１１……切換回路、１２……コンデンサ、１３
……出力ピン、１６……停止回路、１７……マイ
クロコンピユータ。
FIG. 1 is a circuit diagram showing an embodiment of the present invention, FIG. 2 is a circuit diagram showing a conventional count buffer circuit, and FIG. 3 is a circuit diagram showing a specific example of the circuit of the present invention. 11...Switching circuit, 12...Capacitor, 13
...Output pin, 16...Stop circuit, 17...Microcomputer.
Claims (1)
出力端子を有し、前記出力端子に得られるＩＦ信
号をマイクロコンピユータにカウント用の信号と
して印加するとともに、前記マイクロコンピユー
タから発生する制御信号が前記出力端子に印加さ
れるカウントバツフア回路であつて、 前記異なるバンドのＩＦ信号を切換出力する切
換回路と、 該切換回路の出力端と前記出力端子との間に接
続されるコンデンサと、 前記出力端子に印加される制御信号に応じて前
記切換回路の動作を停止させる停止回路と を備えることを特徴とするカウントバツフア回
路。 (2) 前記切換回路は、エミツタが共通に定電流
源に接続された第１及び第２トランジスタから成
る第１差動増幅部と、エミツタが共通に前記定電
流源に接続された第３及び第４トランジスタから
成る第２差動増幅部とを備え、前記第１及び第２
差動増幅部を切換制御することにより、前記第１
及び第２差動増幅部の共通出力端子に第１又は第
２バンドのＩＦ信号を発生することを特徴とする
請求項第１項記載のカウントバツフア回路。 (3) 前記停止回路は、前記制御信号に応じてオ
フする制御トランジスタを備え、前記制御トラン
ジスタがオフになるとき、前記定電流源を動作さ
せ、前記出力端子にＩＦ信号を発生することを特
徴とする請求項第２項記載のカウントバツフア回
路。[Claims for Utility Model Registration] (1) It has an output terminal to which IF signals of different bands are switched and output, and the IF signal obtained at the output terminal is applied to the microcomputer as a counting signal, and the microcomputer A count buffer circuit to which a control signal generated from a computer is applied to the output terminal, a switching circuit for switching and outputting IF signals of different bands, and between the output terminal of the switching circuit and the output terminal. A count buffer circuit comprising: a capacitor connected to the output terminal; and a stop circuit configured to stop the operation of the switching circuit according to a control signal applied to the output terminal. (2) The switching circuit includes a first differential amplifier section including first and second transistors whose emitters are commonly connected to the constant current source, and third and second transistors whose emitters are commonly connected to the constant current source. a second differential amplification section consisting of a fourth transistor;
By controlling the switching of the differential amplification section, the first
2. The count buffer circuit according to claim 1, wherein the IF signal of the first or second band is generated at the common output terminal of the differential amplifier and the second differential amplifier. (3) The stop circuit includes a control transistor that turns off in response to the control signal, and when the control transistor turns off, operates the constant current source and generates an IF signal at the output terminal. 3. The count buffer circuit according to claim 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13622288U JPH0537548Y2 (en) | 1988-10-19 | 1988-10-19 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13622288U JPH0537548Y2 (en) | 1988-10-19 | 1988-10-19 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0257628U true JPH0257628U (en) | 1990-04-25 |
| JPH0537548Y2 JPH0537548Y2 (en) | 1993-09-22 |
Family
ID=31396528
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13622288U Expired - Lifetime JPH0537548Y2 (en) | 1988-10-19 | 1988-10-19 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0537548Y2 (en) |
-
1988
- 1988-10-19 JP JP13622288U patent/JPH0537548Y2/ja not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0537548Y2 (en) | 1993-09-22 |
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