JPS5587938A - Device for picking out pulse-modulated signal - Google Patents

Device for picking out pulse-modulated signal

Info

Publication number
JPS5587938A
JPS5587938A JP16330878A JP16330878A JPS5587938A JP S5587938 A JPS5587938 A JP S5587938A JP 16330878 A JP16330878 A JP 16330878A JP 16330878 A JP16330878 A JP 16330878A JP S5587938 A JPS5587938 A JP S5587938A
Authority
JP
Japan
Prior art keywords
filter
diodes
frequency
pulses
diode
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
JP16330878A
Other languages
Japanese (ja)
Inventor
Noriaki Kurihara
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.)
Jeol Ltd
Original Assignee
Jeol Ltd
Nihon Denshi KK
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 Jeol Ltd, Nihon Denshi KK filed Critical Jeol Ltd
Priority to JP16330878A priority Critical patent/JPS5587938A/en
Publication of JPS5587938A publication Critical patent/JPS5587938A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R33/00—Arrangements or instruments for measuring magnetic variables
    • G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
    • G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
    • G01R33/32—Excitation or detection systems, e.g. using radio frequency signals
    • G01R33/36—Electrical details, e.g. matching or coupling of the coil to the receiver
    • G01R33/3621—NMR receivers or demodulators, e.g. preamplifiers, means for frequency modulation of the MR signal using a digital down converter, means for analog to digital conversion [ADC] or for filtering or processing of the MR signal such as bandpass filtering, resampling, decimation or interpolation

Landscapes

  • Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Manipulation Of Pulses (AREA)
  • Electronic Switches (AREA)

Abstract

PURPOSE:To enable high-frequency pulses of a low level to pass through a diode filter, by forwardly biasing the diodes of the diode filter only when the high-frequency pulses passes through it. CONSTITUTION:A high-frequency wave generated by an oscillator 1 is turned on and off by a gate circuit 2 and a pulse generator 3 which produces a gate signal. When high-frequency pulses (b) are applied from the gate circuit 2 to a diode filter 5 through a capacitor 4, a bias signal (c) synchronized with pulse modulation is applied to the middle point M of the filter. As a result, bias currents flow through diodes D21, D22, D13, D14 and choke coils 7, 8 throughout a period T0, namely, these diodes are turned on. Thus, the pulses are not attenuated and pass with good linearity through the diode filter throughout the period T0 even if the amplitude of the high-frequency wave is small.
JP16330878A 1978-12-26 1978-12-26 Device for picking out pulse-modulated signal Pending JPS5587938A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16330878A JPS5587938A (en) 1978-12-26 1978-12-26 Device for picking out pulse-modulated signal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16330878A JPS5587938A (en) 1978-12-26 1978-12-26 Device for picking out pulse-modulated signal

Publications (1)

Publication Number Publication Date
JPS5587938A true JPS5587938A (en) 1980-07-03

Family

ID=15771353

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16330878A Pending JPS5587938A (en) 1978-12-26 1978-12-26 Device for picking out pulse-modulated signal

Country Status (1)

Country Link
JP (1) JPS5587938A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011087003A (en) * 2009-10-13 2011-04-28 Kanazawa Inst Of Technology Switch circuit, and transmission/reception system and measuring apparatus using the same

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50141393A (en) * 1974-04-24 1975-11-13

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50141393A (en) * 1974-04-24 1975-11-13

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011087003A (en) * 2009-10-13 2011-04-28 Kanazawa Inst Of Technology Switch circuit, and transmission/reception system and measuring apparatus using the same

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