H
SECTION H — ELECTRICITY
 H03
BASIC ELECTRONIC CIRCUITRY
 H03L
AUTOMATIC CONTROL, STARTING, SYNCHRONISATION, OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES (of dynamo-electric generators H02P)  [3]
 H03L

Note(s)

  1. This subclass covers:
    • automatic control circuits for generators of electronic oscillations or pulses; [3]
    • starting, synchronisation, or stabilisation circuits for generators where the type of generator is irrelevant or unspecified. [3]
  2. This subclass does not cover stabilisation or starting circuits specially adapted to only one specific type of generator, which are covered by subclasses H03B, H03K[3]
  3. In this subclass, the following expression is used with the meaning indicated:
    • "automatic control" covers only closed loop systems. [3]
 H03L 1/00
Stabilisation of generator output against variations of physical values, e.g. power supply (automatic control H03L 5/00, H03L 7/00)  [3]
 H03L 1/02
·  against variations of temperature only  [3]
 H03L 1/04
·  ·  Constructional details for maintaining temperature constant  [3]
 H03L 3/00
Starting of generators  [3]
 H03L 5/00
Automatic control of voltage, current, or power  [3]
 H03L 5/02
·  of power  [3]
 H03L 7/00
Automatic control of frequency or phase; Synchronisation (tuning of resonant circuits in general H03J; synchronising in digital communication systems, see the relevant groups in class H04)  [3]
 H03L 7/02
·  using a frequency discriminator comprising a passive frequency-determining element  [3]
 H03L 7/04
·  ·  wherein the frequency-determining element comprises distributed inductance and capacitance  [3]
 H03L 7/06
·  using a reference signal applied to a frequency- or phase-locked loop  [3]
 H03L 7/08
·  ·  Details of the phase-locked loop  [3]
 H03L 7/10
·  ·  ·  for assuring initial synchronisation or for broadening the capture range  [3]
 H03L 7/12
·  ·  ·  ·  using a scanning signal (tuning circuits with automatic scanning over a band of frequencies H03J 7/18)  [3]
 H03L 7/14
·  ·  ·  for assuring constant frequency when supply or correction voltages fail  [3]
 H03L 7/16
·  ·  Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop  [3]
 H03L 7/18
·  ·  ·  using a frequency divider or counter in the loop (H03L 7/20, H03L 7/22 take precedence)  [3]
 H03L 7/20
·  ·  ·  using a harmonic phase-locked loop, i.e. a loop which can be locked to one of a number of harmonically related frequencies applied to it (H03L 7/22 takes precedence)  [3]
 H03L 7/22
·  ·  ·  using more than one loop  [3]
 H03L 7/24
·  using a reference signal directly applied to the generator  [3]
 H03L 7/26
·  using energy levels of molecules, atoms, or subatomic particles as a frequency reference  [3]