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IPC 7
  H03K - H03K 3/86  
H03K00400-H03K00526
  H03K 6/00 - H03K 17/98  

SECTION H – ELECTRICITY


H 03BASIC ELECTRONIC CIRCUITRY


H 03 KPULSE TECHNIQUE (measuring pulse characteristics G01R; mechanical counters having an electrical input G06M; information storage devices in general G11; sample-and-hold arrangements in electric analogue stores G11C 27/02; construction of switches involving contact making and breaking for generation of pulses, e.g. by using a moving magnet, H01H; static conversion of electric power H02M; generation of oscillations by circuits employing active elements which operate in a non-switching manner H03B; modulating sinusoidal oscillations with pulses H03C, H04L; discriminator circuits involving pulse counting H03D; automatic control of generators H03L; starting, synchronisation, or stabilisation of generators where the type of generator is irrelevant or unspecified H03L; coding, decoding or code conversion, in general H03M) [4]


4/

00Generating pulses having essentially a finite slope or stepped portions (generation of supply voltages from deflection waveforms H04N 3/18)

4/

02.having stepped portions, e.g. staircase waveform

4/

04.having parabolic shape

4/

06.having triangular shape

4/

08..having sawtooth shape

4/

10...using as active elements vacuum tubes only

4/

12....in which a sawtooth voltage is produced across a capacitor

4/

14.....using two tubes so coupled that the input of each one is derived from the output of the other, e.g. multivibrator

4/

16.....using a single tube with positive feedback through transformer, e.g. blocking oscillator

4/

18.....using a single tube exhibiting negative resistance between two of its electrodes, e.g. transitron, dynatron

4/

20.....using a tube with negative feedback by capacitor, e.g. Miller integrator

4/

22......combined with transitron, e.g. phantastron, sanatron

4/

24.....Boot-strap generators

4/

26....in which a sawtooth current is produced through an inductor

4/

28.....using a tube operating as a switching device  [3]

4/

32......combined with means for generating the driving pulses

4/

34.......using a single tube with positive feedback through a transformer

4/

36.......using a single tube exhibiting negative resistance between two of its electrodes, e.g. transitron, dynatron

4/

38........combined with Miller integrator

4/

39.....using a tube operating as an amplifier  [3]

4/

41......with negative feedback through a capacitor, e.g. Miller integrator  [3]

4/

43......combined with means for generating the driving pulses  [3]

4/

48...using as active elements semiconductor devices (H03K 4/787 to H03K 4/84 take precedence)

4/

50....in which a sawtooth voltage is produced across a capacitor

4/

501.....the starting point of the flyback period being determined by the amplitude of the voltage across the capacitor, e.g. by a comparator  [6]

4/

502......the capacitor being charged from a constant-current source  [6]

4/

52.....using two semiconductor devices so coupled that the input of each one is derived from the output of the other, e.g. multivibrator

4/

54.....using a single semiconductor device with positive feedback through a transformer, e.g. blocking oscillator

4/

56.....using a semiconductor device with negative feedback through a capacitor, e.g. Miller integrator

4/

58.....Boot-strap generators

4/

60....in which a sawtooth current is produced through an inductor

4/

62.....using a semiconductor device operating as a switching device  [3]

4/

64......combined with means for generating the driving pulses

4/

66.......using a single device with positive feedback, e.g. blocking oscillator

4/

68......Generators in which the switching device is conducting during the fly-back part of the cycle

4/

69.....using a semiconductor device operating as an amplifier  [3]

4/

71......with negative feedback through a capacitor, e.g. Miller integrator  [3]

4/

72......combined with means for generating the driving pulses

4/

787...using as active elements semiconductor devices with two electrodes and exhibiting a negative resistance characteristic  [2]

4/

793....using tunnel diodes  [2]

4/

80...using as active elements multi-layer diodes

4/

83...using as active elements semiconductor devices with more than two PN junctions or with more than three electrodes or more than one electrode connected to the same conductivity region  [2]

4/

84....Generators in which the semiconductor device is conducting during the fly-back part of the cycle

4/

86...using as active elements gas-filled tubes

4/

88...using as active elements electrochemical cells

4/

90...Linearisation of ramp (modifying slopes of pulses H03K 6/04; scanning correction for television receivers H04N 3/16); Synchronisation of pulses (in pictorial communication systems H04N 1/36, H04N 5/04; colour synchronisation H04N 9/44)  [2]

4/

92.having a waveform comprising a portion of a sinusoid (generating sinusoidal oscillations H03B)  [2]

4/

94.having trapezoidal shape  [2]


5/

00Manipulating pulses not covered by one of the other main groups in this subclass (circuits with regenerative action H03K 3/00, H03K 4/00; by the use of non-linear magnetic or dielectric devices H03K 3/45)

Note

 In this group, the input signals are of the pulse type.  [3]

5/

003.Changing the DC level (television signals H04N 3/00)  [6]

5/

007..Base line stabilisation (thresholding H03K 5/08)  [6]

5/

01.Shaping pulses (discrimination against noise or interference H03K 5/125)

5/

02..by amplifying (H03K 5/04 takes precedence; wide-band amplifiers in general H03F)

5/

04..by increasing duration; by decreasing duration

5/

05...by the use of clock signals or other time reference signals  [3]

5/

06...by the use of delay lines or other analogue delay elements  [3]

5/

07...by the use of resonant circuits  [3]

5/

08..by limiting, by thresholding, by slicing, i.e. combined limiting and thresholding (H03K 5/07 takes precedence; comparing one pulse with another H03K 5/22; providing a determined threshold for switching H03K 17/30)  [3]

5/

12..by steepening leading or trailing edges

5/

125.Discriminating pulses (measuring or indicating G01R 19/00, G01R 23/00, G01R 25/00, G01R 29/00; separation of synchronising signals in television systems H04N 5/08)  [6]

5/

1252..Suppression or limitation of noise or interference (specially adapted for transmission systems H04B 15/00, H04L 25/08)  [6]

5/

1254...specially adapted for pulses generated by closure of switches, i.e. anti-bouncing devices (debouncing circuits for electronic time-pieces G04G 5/00)  [6]

5/

13.Arrangements having a single output and transforming input signals into pulses delivered at desired time intervals

5/

135..by the use of time reference signals, e.g. clock signals  [3]

5/

14..by the use of delay lines  [3]

5/

145..by the use of resonant circuits  [3]

5/

15.Arrangements in which pulses are delivered at different times at several outputs, i.e. pulse distributors (distributing, switching, or gating arrangements H03K 17/00)  [2]

5/

151..with two complementary outputs  [6]

5/

153.Arrangements in which a pulse is delivered at the instant when a predetermined characteristic of an input signal is present or at a fixed time interval after this instant (switching at zero crossing H03K 17/13)

5/

1532..Peak detectors (measuring characteristics of individual pulses G01R 29/02)  [6]

5/

1534..Transition or edge detectors  [6]

5/

1536..Zero-crossing detectors (in measuring circuits G01R 19/175)  [6]

5/

156.Arrangements in which a continuous pulse train is transformed into a train having a desired pattern

5/

159.Applications of delay lines not covered by the preceding subgroups

5/

19.Monitoring patterns of pulse trains (indicating amplitude G01R 19/00; indicating frequency G01R 23/00; measuring characteristics of individual pulses G01R 29/02)  [3]

5/

22.Circuits having more than one input and one output for comparing pulses or pulse trains with each other according to input signal characteristics, e.g. slope, integral (indicating phase difference of two cyclic pulse trains G01R 25/00)  [3]

5/

24..the characteristic being amplitude  [3]

5/

26..the characteristic being duration, interval, position, frequency, or sequence  [3]

  H03K - H03K 3/86    H03K 6/00 - H03K 17/98  
 

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