JPS57192120A - Envelope forming circuit - Google Patents

Envelope forming circuit

Info

Publication number
JPS57192120A
JPS57192120A JP7697981A JP7697981A JPS57192120A JP S57192120 A JPS57192120 A JP S57192120A JP 7697981 A JP7697981 A JP 7697981A JP 7697981 A JP7697981 A JP 7697981A JP S57192120 A JPS57192120 A JP S57192120A
Authority
JP
Japan
Prior art keywords
circuit
output
envelope
accuracy
envelope forming
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
JP7697981A
Other languages
Japanese (ja)
Inventor
Hitoshi Kimura
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.)
Fujitsu Ltd
Original Assignee
Fujitsu Ltd
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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP7697981A priority Critical patent/JPS57192120A/en
Publication of JPS57192120A publication Critical patent/JPS57192120A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K4/00—Generating pulses having essentially a finite slope or stepped portions

Landscapes

  • Measurement Of Current Or Voltage (AREA)

Abstract

PURPOSE:To satisfy a tracking response and accuracy of display both, by variably controlling an envelope forming circuit with good display accuracy and a current value of a constant current source with a differential output having good response speed. CONSTITUTION:A diode 15, a capacitor 17 and a resistor 16 form an envelope forming circuit, and its envelope voltage Ee2 changes by following the envelope of an input Ein. Further the circuit constant of envelope forming circuit is selected by emphasizing the response in comparison with the accuracy. The output Ee2 is compared wth an output Ee of an envelope forming basic circuit 14 at a comparator 18 and the differential output Er controls the current value of constant current sources 9c and 10c. Thus, since the output Er is increased when the tracking of the circuit 14 is not followed, the response of the circuit 14 is improved by increasing the control current value of current sources 9c and 10c. On the other hand, when the tracking of the circuit 14 overtakes and the output Er is smaller, since the current value of the current sources 9c and 10c is decreased, the accuracy for the display output Ee can be assured.
JP7697981A 1981-05-21 1981-05-21 Envelope forming circuit Pending JPS57192120A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7697981A JPS57192120A (en) 1981-05-21 1981-05-21 Envelope forming circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7697981A JPS57192120A (en) 1981-05-21 1981-05-21 Envelope forming circuit

Publications (1)

Publication Number Publication Date
JPS57192120A true JPS57192120A (en) 1982-11-26

Family

ID=13620893

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7697981A Pending JPS57192120A (en) 1981-05-21 1981-05-21 Envelope forming circuit

Country Status (1)

Country Link
JP (1) JPS57192120A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002051005A1 (en) * 2000-12-21 2002-06-27 Niigata Seimitsu Co., Ltd. Smoothing circuit
WO2003043187A1 (en) * 2001-11-13 2003-05-22 Niigata Seimitsu Co., Ltd. Automatic gain control circuit

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002051005A1 (en) * 2000-12-21 2002-06-27 Niigata Seimitsu Co., Ltd. Smoothing circuit
US6919710B2 (en) 2000-12-21 2005-07-19 Niigata Seimitsu Co., Ltd. Smoothing circuit
USRE42334E1 (en) 2000-12-21 2011-05-10 Ricoh Company, Ltd. Smoothing circuit employing charging circuit intermittently charging when input voltage is higher relatively than terminal voltage and discharging circuit intermittently releasing discharging current when terminal voltage is higher relatively than input voltage
WO2003043187A1 (en) * 2001-11-13 2003-05-22 Niigata Seimitsu Co., Ltd. Automatic gain control circuit
US6844780B1 (en) 2001-11-13 2005-01-18 Niigata Seimitsu Co., Ltd. Automatic gain control circuit

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