|  | 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 Fulltext... Hierarchy... Expanded...H02P) [3]

|  | H03L |
Note(s) This sub-class includes automatic control circuits for generators of electronic oscillations or pulses and also includes starting, synchronisation, or stabilisation circuits for generators where the type of generator is irrelevant or unspecified. Stabilisation or starting circuits specially adapted to only one specific type of generator are classified with the generator in the relevant sub-group of sub-classes Fulltext... Hierarchy... Expanded...H03B, Fulltext... Hierarchy... Expanded...H03K. [3] The term "automatic control" includes only closed loop systems. [3]

|  | H03L 1/00 |
Stabilisation of generator output against variations of physical values, e.g. power supply (automatic control Fulltext... Hierarchy... Expanded...H03L 5/00, Fulltext... Hierarchy... Expanded...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 Fulltext... Hierarchy... Expanded...H03J; synchronising in digital communication systems, see the relevant groups in class Fulltext... Hierarchy... Expanded...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 Fulltext... Hierarchy... Expanded...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 (Fulltext... Hierarchy... Expanded...H03L 7/20, Fulltext... Hierarchy... Expanded...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 (Fulltext... Hierarchy... Expanded...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]