JPS54114118A - Pre-amplifier for television pickup device - Google Patents

Pre-amplifier for television pickup device

Info

Publication number
JPS54114118A
JPS54114118A JP2087778A JP2087778A JPS54114118A JP S54114118 A JPS54114118 A JP S54114118A JP 2087778 A JP2087778 A JP 2087778A JP 2087778 A JP2087778 A JP 2087778A JP S54114118 A JPS54114118 A JP S54114118A
Authority
JP
Japan
Prior art keywords
amplifier
reference voltage
output
output signal
input terminal
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
JP2087778A
Other languages
Japanese (ja)
Inventor
Yukio Ono
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.)
Hitachi Denshi KK
Original Assignee
Hitachi Denshi KK
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 Hitachi Denshi KK filed Critical Hitachi Denshi KK
Priority to JP2087778A priority Critical patent/JPS54114118A/en
Publication of JPS54114118A publication Critical patent/JPS54114118A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To secure the level compression for the pulse of a large amplitude with the low power voltage and without using any clipping circuit by comparing the output signal level of the pre-amplifier with the preset reference voltage and increasing the negative feedback quantity of the amplifier when the output signal level exceeds the reference voltage.
CONSTITUTION: Resistance R4 and R5 connected in series which form the negative feedback loop are connected between output terminal 7 of amplifier 3 and the gate of FET2 functioning as the input terminal of the pre-amplifier, and then the 1st input terminal of comparison amplifier 8 is connected to the output terminal of amplifier 3. Reference voltage source 10 is connected to the other input terminal of amplifier 8, and the output side of amplifier 8 is connected to gate circuit 10. Thus, feedback resistance R4 of the feedback loop is by-passed by the output of circuit 10. When the output signal of the pre-amplifier exceeds the reference voltage, the feedback quantity of the feedback loop is controlled to compress the level of the output signal.
COPYRIGHT: (C)1979,JPO&Japio
JP2087778A 1978-02-27 1978-02-27 Pre-amplifier for television pickup device Pending JPS54114118A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2087778A JPS54114118A (en) 1978-02-27 1978-02-27 Pre-amplifier for television pickup device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2087778A JPS54114118A (en) 1978-02-27 1978-02-27 Pre-amplifier for television pickup device

Publications (1)

Publication Number Publication Date
JPS54114118A true JPS54114118A (en) 1979-09-06

Family

ID=12039405

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2087778A Pending JPS54114118A (en) 1978-02-27 1978-02-27 Pre-amplifier for television pickup device

Country Status (1)

Country Link
JP (1) JPS54114118A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5656217U (en) * 1979-10-08 1981-05-15

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5656217U (en) * 1979-10-08 1981-05-15
JPS628574Y2 (en) * 1979-10-08 1987-02-27

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