JPS55156408A - Low input impedance ic-implemented amplifier - Google Patents

Low input impedance ic-implemented amplifier

Info

Publication number
JPS55156408A
JPS55156408A JP6442479A JP6442479A JPS55156408A JP S55156408 A JPS55156408 A JP S55156408A JP 6442479 A JP6442479 A JP 6442479A JP 6442479 A JP6442479 A JP 6442479A JP S55156408 A JPS55156408 A JP S55156408A
Authority
JP
Japan
Prior art keywords
grounded
amplifier
input impedance
transistors
base 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
JP6442479A
Other languages
Japanese (ja)
Inventor
Takeshi Sato
Masaaki Mochizuki
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP6442479A priority Critical patent/JPS55156408A/en
Publication of JPS55156408A publication Critical patent/JPS55156408A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/56—Modifications of input or output impedances, not otherwise provided for

Abstract

PURPOSE:To reduce the input impedance of an IC-implemented grounded-base amplifier by mutually connecting the bases of two transistors, connected to respective inputs of a differential amplifier, direct to each other. CONSTITUTION:Signals from signal input terminals 5 and 6 are input to the differential grounded-base circuit composed of transistors 25 and 26 and their bases are connected direct to each other, so that signals, differing in polarity, applied to signal input terminals 5 and 6 will be grounded (virtually grounded). As a result, a grounded-base circuit is realized and low input impedance is obtained. Even when the gain of the amplifier composed of transistors 3 and 4 is controlled by this grounded base circuit consisting of transistors 25 and 26, the input impedance is unchanged, so that frequency characteristics of a video intermediate frequency amplifier in gain control will improve.
JP6442479A 1979-05-24 1979-05-24 Low input impedance ic-implemented amplifier Pending JPS55156408A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6442479A JPS55156408A (en) 1979-05-24 1979-05-24 Low input impedance ic-implemented amplifier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6442479A JPS55156408A (en) 1979-05-24 1979-05-24 Low input impedance ic-implemented amplifier

Publications (1)

Publication Number Publication Date
JPS55156408A true JPS55156408A (en) 1980-12-05

Family

ID=13257875

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6442479A Pending JPS55156408A (en) 1979-05-24 1979-05-24 Low input impedance ic-implemented amplifier

Country Status (1)

Country Link
JP (1) JPS55156408A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08504979A (en) * 1991-07-15 1996-05-28 ドーグマン、ジョン・ジー Biometric person identification system based on iris analysis

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08504979A (en) * 1991-07-15 1996-05-28 ドーグマン、ジョン・ジー Biometric person identification system based on iris analysis

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