JPS5646329A - Digital-analog converting circuit - Google Patents

Digital-analog converting circuit

Info

Publication number
JPS5646329A
JPS5646329A JP12185579A JP12185579A JPS5646329A JP S5646329 A JPS5646329 A JP S5646329A JP 12185579 A JP12185579 A JP 12185579A JP 12185579 A JP12185579 A JP 12185579A JP S5646329 A JPS5646329 A JP S5646329A
Authority
JP
Japan
Prior art keywords
circuit
output
width modulation
pulse width
voltage
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
JP12185579A
Other languages
Japanese (ja)
Inventor
Masahiro Fujita
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura 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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP12185579A priority Critical patent/JPS5646329A/en
Publication of JPS5646329A publication Critical patent/JPS5646329A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J5/00—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner
    • H03J5/02—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner with variable tuning element having a number of predetermined settings and adjustable to a desired one of these settings
    • H03J5/0245—Discontinuous tuning using an electrical variable impedance element, e.g. a voltage variable reactive diode, in which no corresponding analogue value either exists or is preset, i.e. the tuning information is only available in a digital form
    • H03J5/0254—Discontinuous tuning using an electrical variable impedance element, e.g. a voltage variable reactive diode, in which no corresponding analogue value either exists or is preset, i.e. the tuning information is only available in a digital form the digital values being transfered to a D/A converter

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Analogue/Digital Conversion (AREA)
  • Channel Selection Circuits, Automatic Tuning Circuits (AREA)

Abstract

PURPOSE:To simplify the LPF to obtain the DC voltage, by branching the output of pulse width modulation into a plurality of paths, and superimposing this output signal on different DC potential with a plurality of voltage dividing resistors for synthesis. CONSTITUTION:The frequency division output of the sweep out counter circuit 16 of the pulse width modulation circuit 11 is input to the counter circuit 21 to constitute the change-over means. In the circuit 21, the output signal in 2 bits is input to the gate circuit 22, where the pulses in four states of the circuit 21 are independently output to control the gate circuit 23 with the pulses in this state. The gate circuit 23 switches and selects the path of conduction of the pulse width modulation output from the circuit 11, depending on the state of pulse from the circuit 22. The output of the circuit 23 is input to the synthesis circuit 24 synthesizing the DC components. The circuit 24 divides the power supply voltage VP at the resistances R1- R4 to control the conduction of the transfer gates TG0-TG4 with the output pulse from the circuit 23, and the pulse width modulation signal is superimposed on the DC potential divided for output and the DC voltage is output via the LPF25.
JP12185579A 1979-09-21 1979-09-21 Digital-analog converting circuit Pending JPS5646329A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12185579A JPS5646329A (en) 1979-09-21 1979-09-21 Digital-analog converting circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12185579A JPS5646329A (en) 1979-09-21 1979-09-21 Digital-analog converting circuit

Publications (1)

Publication Number Publication Date
JPS5646329A true JPS5646329A (en) 1981-04-27

Family

ID=14821594

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12185579A Pending JPS5646329A (en) 1979-09-21 1979-09-21 Digital-analog converting circuit

Country Status (1)

Country Link
JP (1) JPS5646329A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106483372A (en) * 2016-09-21 2017-03-08 惠州市和瑞龙电器有限公司 A kind of direct current energy metering method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106483372A (en) * 2016-09-21 2017-03-08 惠州市和瑞龙电器有限公司 A kind of direct current energy metering method

Similar Documents

Publication Publication Date Title
US3548342A (en) Digitally controlled amplitude modulation circuit
GB1479535A (en) Current-source arrangement
JPS6489621A (en) Frequency synthesizer
CA1008130A (en) Bias transformer circuit for dual voltage input off-line converters
KR960006265A (en) Voltage and Resistance Synthesizer Using Pulse Width Modulation
JPS5646329A (en) Digital-analog converting circuit
EP0166705A3 (en) A method for measuring of capacities, particular low ones
JPS6454270A (en) Integration type multi-phase wattmeter
GB1057180A (en) A semiconductor drive circuit
GB1175029A (en) Three-phase generator
GB1196936A (en) D-C to A-C Converter
JPS57119686A (en) Control device for motor
JPS567553A (en) Digital type fm modulator
GB1436852A (en) Voltage-to-digital converter
JPS5640314A (en) Pulse width modulating amplifier
SU393808A1 (en) DEVICE FOR TWO-CHANNEL MODULATION OF PULSE PERIODIC SIGNALS
SU576512A1 (en) Multichannel tensotkansducer
JPS55121511A (en) Variation system for output voltage of power unit
GB1494146A (en) Modulator circuit arrangement
SE333018B (en)
SU813706A1 (en) Switch-type generator control device
SU1201852A1 (en) Element with controlled conductivity
SU839011A1 (en) Device for control of thyristorized frequetcy converter
JPS566686A (en) Revolution speed controlling device for motor
SU464851A1 (en) Spectrum analyzer