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IPC 7
H03-H03B02900

SECTION H – ELECTRICITY


H 03BASIC ELECTRONIC CIRCUITRY


H 03 BGENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS (measuring, testing G01R; generators adapted for electrophonic musical instruments G10H; speech synthesis G10L 13/00; masers, lasers H01S; dynamo-electric machines H02K; power inverter circuits H02M; by using pulse techniques H03K; automatic control of generators H03L; starting, synchronisation or stabilisation of generators where the type of generator is irrelevant or unspecified H03L; generation of oscillations in plasma H05H)


Subclass Index

GENERATION WITHOUT FREQUENCY-CHANGING 

By means of amplification and feedback; negative resistance 

H03B 5/00; H03B 7/00 

By means of transit-time tubes; electron-beam tubes 

H03B 9/00; H03B 13/00 

By shock-exciting; Hall effect; radiation source and detectors 

H03B 11/00; H03B 15/00; H03B 17/00 

GENERATION WITH FREQUENCY- CHANGING 

By multiplication or division of a signal 

H03B 19/00 

By combining unmodulated signals 

H03B 21/00 

PARTICULARITIES OF GENERATED OSCILLATIONS 

Swept-over frequency range; multi-frequency; multiphase; noise 

H03B 23/00; H03B 25/00; H03B 27/00; H03B 29/00 

OTHER METHODS OF GENERATION 

H03B 28/00 

DETAILS 

H03B 1/00 



1/

00Details

1/

02.Structural details of power oscillators, e.g. for heating

1/

04.Reducing undesired oscillations, e.g. harmonics


5/

00Generation of oscillations using amplifier with regenerative feedback from output to input (H03B 9/00, H03B 15/00 take precedence)

5/

02.Details

5/

04..Modifications of generator to compensate for variations in physical values, e.g. power supply, load, temperature

5/

06..Modifications of generator to ensure starting of oscillations

5/

08.with frequency-determining element comprising lumped inductance and capacitance

5/

10..active element in amplifier being vacuum tube (H03B 5/14 takes precedence)

5/

12..active element in amplifier being semiconductor device (H03B 5/14 takes precedence)

5/

14..frequency-determining element connected via bridge circuit to closed ring around which signal is transmitted

5/

16...active element in amplifier being vacuum tube

5/

18.with frequency-determining element comprising distributed inductance and capacitance

5/

20.with frequency-determining element comprising resistance and either capacitance or inductance, e.g. phase-shift oscillator

5/

22..active element in amplifier being vacuum tube (H03B 5/26 takes precedence)

5/

24..active element in amplifier being semiconductor device (H03B 5/26 takes precedence)

5/

26..frequency-determining element being part of bridge circuit in closed ring around which signal is transmitted; frequency-determining element being connected via a bridge circuit to such a closed ring, e.g. Wien-Bridge oscillator, parallel-T oscillator

5/

28...active element in amplifier being vacuum tube

5/

30.with frequency-determining element being electromechanical resonator

5/

32..being a piezo-electric resonator (piezo-electric elements in general H01L 41/00)

5/

34...active element in amplifier being vacuum tube (H03B 5/38 takes precedence)

5/

36...active element in amplifier being semiconductor device (H03B 5/38 takes precedence)

5/

38...frequency-determining element being connected via bridge circuit to closed ring around which signal is transmitted

5/

40..being a magnetostrictive resonator (H03B 5/42 takes precedence; magnetostrictive elements in general H01L 41/00)

5/

42..frequency-determining element connected via bridge circuit to closed ring around which signal is transmitted


7/

00Generation of oscillations using active element having a negative resistance between two of its electrodes (H03B 9/00 takes precedence)

7/

02.with frequency-determining element comprising lumped inductance and capacitance

7/

04..active element being vacuum tube

7/

06..active element being semiconductor device

7/

08...being a tunnel diode

7/

10..active element being gas-discharge or arc-discharge tube

7/

12.with frequency-determining element comprising distributed inductance and capacitance

7/

14..active element being semiconductor device


9/

00Generation of oscillations using transit-time effects  [2]

9/

01.using discharge tubes  [2]

9/

02..using a retarding-field tube (using klystrons H03B 9/04)  [2]

9/

04..using a klystron  [2]

9/

06...using a reflex klystron  [2]

9/

08..using a travelling-wave tube  [2]

9/

10..using a magnetron  [2]

9/

12.using solid state devices, e.g. Gunn-effect devices  [2]

9/

14..and elements comprising distributed inductance and capacitance  [3]


11/

00Generation of oscillations using a shock-excited tuned circuit (with feedback H03B 5/00)

11/

02.excited by spark (spark gaps therefor H01T 9/00)

11/

04.excited by interrupter

11/

06..by mechanical interrupter

11/

08..interrupter being discharge tube

11/

10..interrupter being semiconductor device


13/

00Generation of oscillations using deflection of electron beam in a cathode-ray tube


15/

00Generation of oscillations using galvano-magnetic devices, e.g. Hall-effect devices, or using super-conductivity effects (galvano-magnetic devices per se H01L 43/00)


17/

00Generation of oscillations using radiation source and detector, e.g. with interposed variable obturator


19/

00Generation of oscillations by non-regenerative frequency multiplication or division of a signal from a separate source (transference of modulation from one carrier to another H03D 7/00)

19/

03.using non-linear inductance  [3]

19/

05.using non-linear capacitance, e.g. varactor diodes  [3]

19/

06.by means of discharge device or semiconductor device with more than two electrodes

19/

08..by means of a discharge device

19/

10...using multiplication only

19/

12...using division only

19/

14..by means of a semiconductor device

19/

16.using uncontrolled rectifying devices, e.g. rectifying diodes or Schottky diodes  [3]

19/

18..and elements comprising distributed inductance and capacitance  [3]

19/

20..being diodes exhibiting charge storage or enhancement effects  [3]


21/

00Generation of oscillations by combining unmodulated signals of different frequencies (H03B 19/00 takes precedence; frequency changing circuits in general H03D) [3]

21/

01.by beating unmodulated signals of different frequencies  [3]

21/

02..by plural beating, i.e. for frequency synthesis  [3]

21/

04..using several similar stages  [3]


23/

00Generation of oscillations periodically swept over a predetermined frequency range (angle-modulating circuits in general H03C 3/00)


25/

00Simultaneous generation by a free-running oscillator of oscillations having different frequencies


27/

00Generation of oscillations providing a plurality of outputs of the same frequency but differing in phase, other than merely two anti-phase outputs


28/

00Generation of oscillations by methods not covered by groups H03B 5/00 to H03B 27/00, including modification of the waveform to produce sinusoidal oscillations (analogue function generators for performing computing operations G06G 7/26; use of transformers for conversion of waveform in ac-ac converters H02M 5/18) [4]


29/

00Generation of noise currents and voltages


  
 

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