JPS6465905A - High input impedance circuit - Google Patents

High input impedance circuit

Info

Publication number
JPS6465905A
JPS6465905A JP62222819A JP22281987A JPS6465905A JP S6465905 A JPS6465905 A JP S6465905A JP 62222819 A JP62222819 A JP 62222819A JP 22281987 A JP22281987 A JP 22281987A JP S6465905 A JPS6465905 A JP S6465905A
Authority
JP
Japan
Prior art keywords
circuit
current
constant current
equal
input
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
Application number
JP62222819A
Other languages
Japanese (ja)
Other versions
JPH0624297B2 (en
Inventor
Seiichiro Kihara
Seiichi Yokogawa
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.)
Sharp Corp
Original Assignee
Sharp Corp
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 Sharp Corp filed Critical Sharp Corp
Priority to JP62222819A priority Critical patent/JPH0624297B2/en
Publication of JPS6465905A publication Critical patent/JPS6465905A/en
Publication of JPH0624297B2 publication Critical patent/JPH0624297B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Landscapes

  • Amplifiers (AREA)

Abstract

PURPOSE:To prevent the fall of input impedance by providing a differential amplifier with first and second input terminals, constituted of a pair of transistors(TR), and a constant current source circuit, and giving an alternating current signal to the first input terminal, and at the same time, connecting it to the constant current power source circuit, and impressing a bias voltage to the second input terminal. CONSTITUTION:The TRs 1A-2C constitute a current mirror circuit 23, and said current mirror circuit 23 and a TR IC and the constant current source 22 constitute the constant current source circuit 24. Said circuit 24 generates always a current equal to the current to flow in the input terminals 13, 17 when the voltages of those input terminals are equal. Then, when the base current Ibc1 of the TR IC is made to flow into the base of the TR 1A by the current mirror circuit 23, the base voltage of the TR 1A comes equal to the voltage of a bias power source 18. At that time, the bias voltage of the input terminal 13 is given by the constant current source circuit 24, and the fall of the input impedance owing to that a bias circuit is provided in the differential amplifier 10 comes to be zero.
JP62222819A 1987-09-05 1987-09-05 High input impedance circuit Expired - Lifetime JPH0624297B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62222819A JPH0624297B2 (en) 1987-09-05 1987-09-05 High input impedance circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62222819A JPH0624297B2 (en) 1987-09-05 1987-09-05 High input impedance circuit

Publications (2)

Publication Number Publication Date
JPS6465905A true JPS6465905A (en) 1989-03-13
JPH0624297B2 JPH0624297B2 (en) 1994-03-30

Family

ID=16788407

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62222819A Expired - Lifetime JPH0624297B2 (en) 1987-09-05 1987-09-05 High input impedance circuit

Country Status (1)

Country Link
JP (1) JPH0624297B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103616924A (en) * 2013-11-28 2014-03-05 瑞声声学科技(深圳)有限公司 Sensor circuit

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6157105A (en) * 1984-08-28 1986-03-24 Matsushita Electric Ind Co Ltd High input impedance amplifier

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6157105A (en) * 1984-08-28 1986-03-24 Matsushita Electric Ind Co Ltd High input impedance amplifier

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103616924A (en) * 2013-11-28 2014-03-05 瑞声声学科技(深圳)有限公司 Sensor circuit

Also Published As

Publication number Publication date
JPH0624297B2 (en) 1994-03-30

Similar Documents

Publication Publication Date Title
DE69431721D1 (en) ELECTRIC CHARGE TRANSFER ARRANGEMENT
KR840000112A (en) Pulse width modulated signal amplifier
CA2009476A1 (en) Differential amplifier using voltage level shifting to achieve rail-to-rail input capability at very low power supply voltage
JPS5750139A (en) Hysteresis circuit
JPS6465905A (en) High input impedance circuit
DE3672511D1 (en) INTEGRATED AMPLIFIER CIRCUIT.
JPS6450604A (en) High gain amplifier using two current mirrors
WO1998004037A3 (en) Electronic circuit comprising complementary transconductors for filters and oscillators
JPS56132006A (en) Differential amplifier
JPS5728407A (en) Amplifying circuit
DE3369039D1 (en) Integrated amplifier circuit
JPS54139362A (en) Signal amplifier
JPS52102659A (en) Differential amplifier
JPS5717207A (en) Amplifying circuit
JPS5630307A (en) Direct-coupled differential amplifying circuit
JPS57103434A (en) Frequency dividing circuit
JPS55147826A (en) Waveform shaping circuit
JPS6418317A (en) Digital-analog converter circuit
JPS56136007A (en) Phase inverting circuit
ES8206936A1 (en) Signal buffer circuit in an integrated circuit for applying an output signal to a connecting terminal thereof
JPS5568729A (en) Input circuit with input level decision
JPS5765021A (en) Dynamic frequency division circuit
JPS6451810A (en) High impedance input device
JPS5797227A (en) Electronic switching amplifying circuit
JPS645217A (en) Voltage limit circuit

Legal Events

Date Code Title Description
EXPY Cancellation because of completion of term
FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20080330

Year of fee payment: 14