US2212851A - System for amplifying electrical oscillations - Google Patents

System for amplifying electrical oscillations Download PDF

Info

Publication number
US2212851A
US2212851A US102727A US10272736A US2212851A US 2212851 A US2212851 A US 2212851A US 102727 A US102727 A US 102727A US 10272736 A US10272736 A US 10272736A US 2212851 A US2212851 A US 2212851A
Authority
US
United States
Prior art keywords
cathode
tube
damping
control grid
transit time
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.)
Expired - Lifetime
Application number
US102727A
Other languages
English (en)
Inventor
Ziel Aldert Van Der
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.)
RCA Corp
Original Assignee
RCA 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 RCA Corp filed Critical RCA Corp
Application granted granted Critical
Publication of US2212851A publication Critical patent/US2212851A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/08—Modifications of amplifiers to reduce detrimental influences of internal impedances of amplifying elements

Definitions

  • the invention relates to amplifying systems for very high frequencies wherein the control grid and the cathode of one or more amplifying tubes are connected to a tuned oscillatory circuit.
  • the transit time damping is equal to Where S is the steepness of the characteristic curve which indicates the relation between the total current flowing through the control grid and the control grid voltage while or represents the, angular frequency of the high-frequency voltages applied and t the transit time of the electrons between the cathode and the control grid.
  • the amplification of the system is regulated by causing the bias voltage of the control grids of the amplifying tubes to vary, the slope and therefore also the transit time damping have difierent values for every value of the amplification. If an oscillatory circuit is connected between the control grid and the cathode of one or more of the amplifying tubes, the damping of this circuit and therefore the selectivity of the system will be different for every value of the amplification.
  • a damping effect which depends on the steepness of an amplifying tube may be obtained, as is well-known, by connecting a resistance into the cathode lead of the tube.
  • a selectivity which is independent of the amplification is obtained, according to the invention, by including in the cathode lead of the tube or tubes a resistance of such value that the variation of transit time damping with amplification is compensated for.
  • the drawing represents a screen grid tube wherein the control grid G and the cathode K are connected to a tuned oscillatory circuit consisting of an inductance L and a variable capacity C.
  • the damping of the oscillatory circuit is represented by the parallel resistance R (shown dotted).
  • an impedance In parallel with the oscillatory circuit is consequently located an impedance:
  • the damping produced by the resistance R1 consequently amounts to m C R 51302 ulc k) With wave-lengths of about 6 to 12 meters ak k 1
  • selectivity of the system is independent of the bias voltages of the control grids of the amplifying tubes.
  • a system for the amplification of high frequency oscillations comprising a vacuum tube amplifier having grid and cathode electrodes, a tunable circuit connected to said grid and cathode, and a bias resistance connected to the cathode, said bias resistance being so proportioned to the damping between said grid and cathode due to the transit time of the electrodes that the selectivity of the system is independent of amplification.
  • a vacuum tube amplifying circuit operating in a range of high frequencies at which the transit time of the electrons in the tube causes damping of the tube input circuit, said transit time damping varying with changes in the bias voltage applied to the control grid of the tube, and a resistance connected to the cathode of said tube and being of such value that the transit time damping is substantially independent of changes in the control grid biasing voltage.
  • a vacuum tube amplifying circuit operating in a range of high frequencies at which the transit time of the electrons in the tube causes damping of the tube input circuit
  • a system for the amplification of high frequencies comprising a vacuum tube amplifier provided with a plurality of electrodes including a control grid and a cathode, an input circuit connected between said control grid and cathode, said system operating at frequencies so high that the transit time of the electrons in the tube causes variations in the damping of tube input circuit with changes in the biasing voltage applied to the control grid, and means comprising a resistance connected to the cathode whereby the damping due to the electron transit time is substantially compensated for.
  • a system for the amplification of high frequency oscillations comprising a vacuum tube amplifier provided with a plurality of electrodes including an input control grid and a cathode, said system operating at frequencies so high that the transit time of the electrons in the tube.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Amplifiers (AREA)
US102727A 1935-10-18 1936-09-26 System for amplifying electrical oscillations Expired - Lifetime US2212851A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE471398X 1935-10-18

Publications (1)

Publication Number Publication Date
US2212851A true US2212851A (en) 1940-08-27

Family

ID=6541263

Family Applications (1)

Application Number Title Priority Date Filing Date
US102727A Expired - Lifetime US2212851A (en) 1935-10-18 1936-09-26 System for amplifying electrical oscillations

Country Status (5)

Country Link
US (1) US2212851A (enrdf_load_html_response)
BE (1) BE417947A (enrdf_load_html_response)
FR (1) FR811888A (enrdf_load_html_response)
GB (1) GB471398A (enrdf_load_html_response)
NL (1) NL50266C (enrdf_load_html_response)

Also Published As

Publication number Publication date
NL50266C (enrdf_load_html_response)
FR811888A (fr) 1937-04-24
BE417947A (enrdf_load_html_response)
GB471398A (en) 1937-09-03

Similar Documents

Publication Publication Date Title
US2115858A (en) Harmonic reduction circuits
US2324279A (en) Amplifier
US2235019A (en) Temperature compensating device
US2342492A (en) Ultra-high-frequency amplifier
US2212851A (en) System for amplifying electrical oscillations
US2230483A (en) Stabilization for vacuum tube amplifiers
US2930986A (en) Distributed amplifier
US2237420A (en) Amplifier gain control circuit
US2299366A (en) High-frequency amplifying circuits
US2033986A (en) Frequency converter
US2143864A (en) Wide range beat frequency generator
US2281205A (en) Voltage variation compensator
US2226259A (en) Amplifier
US3024423A (en) Electrical apparatus
US2058738A (en) Electrical circuit for cold cathode tubes
US2616036A (en) Signal translating apparatus
US2077126A (en) Volume control arrangement
US1839481A (en) Circuit arbangement for generating electric oscillations
US1904524A (en) Amplifier
US2801299A (en) Improved ultra-high frequency amplifier
US2527441A (en) Automatic volume control circuit
US2527737A (en) Variable frequency band width amplifier
US1968104A (en) Amplifying system
US2228081A (en) Correction circuits
US2097896A (en) Amplifying arrangement