FR2407528A1 - Analogue signal processing circuit - includes two transistors and operational amplifier to derive RMS of input voltage - Google Patents

Analogue signal processing circuit - includes two transistors and operational amplifier to derive RMS of input voltage

Info

Publication number
FR2407528A1
FR2407528A1 FR7825690A FR7825690A FR2407528A1 FR 2407528 A1 FR2407528 A1 FR 2407528A1 FR 7825690 A FR7825690 A FR 7825690A FR 7825690 A FR7825690 A FR 7825690A FR 2407528 A1 FR2407528 A1 FR 2407528A1
Authority
FR
France
Prior art keywords
operational amplifier
transistor
input voltage
transistors
signal processing
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
FR7825690A
Other languages
French (fr)
Other versions
FR2407528B3 (en
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.)
RFT MESSELEKTRONIK DRESDEN VEB
Original Assignee
RFT MESSELEKTRONIK DRESDEN VEB
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 RFT MESSELEKTRONIK DRESDEN VEB filed Critical RFT MESSELEKTRONIK DRESDEN VEB
Publication of FR2407528A1 publication Critical patent/FR2407528A1/en
Application granted granted Critical
Publication of FR2407528B3 publication Critical patent/FR2407528B3/fr
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K7/00—Modulating pulses with a continuously-variable modulating signal
    • H03K7/06—Frequency or rate modulation, i.e. PFM or PRM
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06G—ANALOGUE COMPUTERS
    • G06G7/00—Devices in which the computing operation is performed by varying electric or magnetic quantities
    • G06G7/12—Arrangements for performing computing operations, e.g. operational amplifiers
    • G06G7/24—Arrangements for performing computing operations, e.g. operational amplifiers for evaluating logarithmic or exponential functions, e.g. hyperbolic functions

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Mathematical Physics (AREA)
  • Theoretical Computer Science (AREA)
  • Software Systems (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Amplifiers (AREA)
  • Measurement Of Current Or Voltage (AREA)

Abstract

A voltage proportional to the logarithm of the modulus of an alternating signal is fed to the base of a first transistor. The emitter of this transistor is coupled to the output of an operational amplifier and the base of a second transistor of like conductivity type whose emitter is connected to earth. The output of a reference voltage source is connected by a parallel resistance-capacitance circuit to the inverting input of the operational amplifier and the collector of the first transistor and by way of a second resistor to the non-inverting input of the amplifier. The voltage appearing across the first resistor is proportional to the root-mean-square of the input voltage.
FR7825690A 1977-10-27 1978-09-06 Analogue signal processing circuit - includes two transistors and operational amplifier to derive RMS of input voltage Granted FR2407528A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DD20171377A DD133178B1 (en) 1977-10-27 1977-10-27 CIRCUIT ARRANGEMENT FOR FORMING THE EFFECTIVE VALUE

Publications (2)

Publication Number Publication Date
FR2407528A1 true FR2407528A1 (en) 1979-05-25
FR2407528B3 FR2407528B3 (en) 1981-07-24

Family

ID=5510207

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7825690A Granted FR2407528A1 (en) 1977-10-27 1978-09-06 Analogue signal processing circuit - includes two transistors and operational amplifier to derive RMS of input voltage

Country Status (4)

Country Link
DD (1) DD133178B1 (en)
DE (1) DE2834052A1 (en)
DK (1) DK475378A (en)
FR (1) FR2407528A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4788494A (en) * 1985-01-09 1988-11-29 Refac Electronics Corporation Power measuring apparatus

Also Published As

Publication number Publication date
FR2407528B3 (en) 1981-07-24
DK475378A (en) 1979-04-28
DE2834052A1 (en) 1979-05-10
DD133178B1 (en) 1984-12-05
DD133178A1 (en) 1978-12-13

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Legal Events

Date Code Title Description
ST Notification of lapse