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JPS54127658A - Variable attenuator circuit - Google Patents

Variable attenuator circuit

Info

Publication number
JPS54127658A
JPS54127658A JP3564978A JP3564978A JPS54127658A JP S54127658 A JPS54127658 A JP S54127658A JP 3564978 A JP3564978 A JP 3564978A JP 3564978 A JP3564978 A JP 3564978A JP S54127658 A JPS54127658 A JP S54127658A
Authority
JP
Japan
Prior art keywords
resistance
bias
variable
fet
value
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
JP3564978A
Other languages
Japanese (ja)
Inventor
Yoshiyuki Mizuta
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.)
NEC Corp
Original Assignee
NEC Corp
Nippon Electric 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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP3564978A priority Critical patent/JPS54127658A/en
Publication of JPS54127658A publication Critical patent/JPS54127658A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H11/00—Networks using active elements
    • H03H11/02—Multiple-port networks
    • H03H11/24—Frequency-independent attenuators
    • H03H11/245—Frequency-independent attenuators using field-effect transistor

Landscapes

  • Attenuators (AREA)

Abstract

PURPOSE:To realize a wide range of variable attenuation width with the minor current by using the PIN diode and the FET in parallel and in series respectively to the signal transmission line of the pi-type variable attenuator. CONSTITUTION:With increment of the bias current, the resistance of PIN diode 12 and 13 is decreased to the signal. And the voltage drop caused by bias resistance 14 is applied to the gate of FET11, thus satisfying the condition for the constant impedance of the value of each variable resistance element of the pi-type attenuator. The variation characteristics of the resistance between the drain and the source of FET to the bias current is adjusted by the change of the division ratio of bias resistance 14 and the value of bias resistance 14 inself.
JP3564978A 1978-03-28 1978-03-28 Variable attenuator circuit Pending JPS54127658A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3564978A JPS54127658A (en) 1978-03-28 1978-03-28 Variable attenuator circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3564978A JPS54127658A (en) 1978-03-28 1978-03-28 Variable attenuator circuit

Publications (1)

Publication Number Publication Date
JPS54127658A true JPS54127658A (en) 1979-10-03

Family

ID=12447713

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3564978A Pending JPS54127658A (en) 1978-03-28 1978-03-28 Variable attenuator circuit

Country Status (1)

Country Link
JP (1) JPS54127658A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5650759A (en) * 1979-10-03 1981-05-08 Asahi Malleable Iron Co Ltd Metal mold for casting insulator cap
US4570207A (en) * 1982-10-20 1986-02-11 Sho-Bond Construction Co., Ltd. Luminous indicating device
US5440280A (en) * 1993-09-17 1995-08-08 Mpr Teltech Ltd. Digital microwave multi-bit attenuator
US5903178A (en) * 1994-12-16 1999-05-11 Matsushita Electronics Corporation Semiconductor integrated circuit

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5650759A (en) * 1979-10-03 1981-05-08 Asahi Malleable Iron Co Ltd Metal mold for casting insulator cap
JPS63142B2 (en) * 1979-10-03 1988-01-05 Asahi Malleable Iron Co Ltd
US4570207A (en) * 1982-10-20 1986-02-11 Sho-Bond Construction Co., Ltd. Luminous indicating device
US5440280A (en) * 1993-09-17 1995-08-08 Mpr Teltech Ltd. Digital microwave multi-bit attenuator
US5903178A (en) * 1994-12-16 1999-05-11 Matsushita Electronics Corporation Semiconductor integrated circuit

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