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US 4,048,590 AGranted
Integrated crystal oscillator circuit with few external components
AssigneeGeneral Electric Company
InventorDaniel W. Dobberpuhl
Life of this patent
Estimating the term…
Abstract
A semiconductor integrated oscillator circuit requiring higher impedances than are practical by integrated circuit technology and generally provided by discrete components external to the circuit are functionally provided in the integrated circuit by a "current mirror" circuit which provides the bias function separate from the signal function.
Claims4
A semiconductor integrated circuit comprising:
- a current path including a first current limiting device serially connected with an active device, the connection between said devices being a nodal point;
- a current mirror circuit connected in electrical parallel relationship with said current path for providing a bias voltage to said active device separately and independently of said current path, said current mirror circuit including second and third current limiting devices serially connected together, the connection therebetween being another nodal point, which other nodal point provides the bias voltage substantially identical to the bias voltage at said one nodal point;
- a frequency controlling element operatively connected to said active device for causing said active device to oscillate at a frequency determined by said frequency controlling element;
- and
- a transistor connected to said other nodal point and said active device for providing said bias voltage to said active device.
2 more elements
Dependencies are inferred from the claim text.