Single-pin oscillator
AssigneeU.S. Philips Corporation
InventorMatthias Peters
Life of this patent
Estimating the term…
Abstract
A single pin oscillator which consists of first and second transistors (17, 18) whose collectors are connected, via respective collector resistances (19, 20), to the positive pole of a DC source U.sub.V and whose emitters are connected to the negative pole thereof via respective emitter resistances (21, 22). The collector of each transistor is connected to the base of the other transistor. A quartz crystal (12) or a series resonant circuit is connected to the emitter of one transistor (17) and parallel to the corresponding emitter resistance (21). A driver circuit (23) is provided for an oscillator voltage which can be coupled out to an external low-ohmic, highly capacitive load connected to the emitter of the other transistor (18) and parallel to the corresponding emitter resistance (22).
Claims12
An oscillator comprising:
- first and second directly cross-coupled inverters,
- said first inverter comprising a first transistor connected between first and second resistances in a first series circuit coupled to terminals of a source of supply voltage for the oscillator,
- said second inverter comprising a second transistor connected between third and fourth resistances in a second series circuit coupled to said terminals of the supply voltage source,
- a frequency-determining element connected in parallel with one of the resistances in one of said inverters, and
- means for coupling an oscillator signal developed at a non-inverting output of the other one of said inverters to an output of the oscillator.
An integrated circuit including an oscillator, said oscillator comprising:
- a first transistor connected between first and second resistances in a first series circuit coupled to terminals of a source of supply voltage for the oscillator,
- a second transistor connected between third and fourth resistances in a second series circuit coupled to said terminals of the supply voltage source,
- means for coupling an inverting output of the second transistor to a control electrode of the first transistor and an inverting output of the first transistor to a control electrode of the second transistor,
- means for coupling a non-inverting output of the first transistor to an output pin of the integrated circuit,
- means for coupling an external frequency-determining element to said output pin so that said frequency-determining element is connected in parallel with that one of said first and second resistances that is connected to said non-inverting output of the first transistor, and
- a further output of the integrated circuit being coupled to a non-inverting output of the second transistor for supplying an oscillation signal to an external load.
Dependencies are inferred from the claim text.