Oscillators – Solid state active element oscillator – Transistors
Patent
1993-07-07
1994-09-06
Grimm, Siegfried H.
Oscillators
Solid state active element oscillator
Transistors
331143, 331177R, 3072968, H03K 3354
Patent
active
053451961
ABSTRACT:
A variable frequency oscillator (19) and method of producing an oscillating signal are provided in which a current mirror (12) receives a control current and generates a mirrored current. A capacitor (20) is coupled to the current mirror (12) and charges and discharges through the current mirror (12) based on the direction of the mirrored current. A trigger (22) is coupled to the capacitor (20) and outputs a first voltage level when the capacitor (20) charges to a first voltage threshold and outputs a second voltage level when the capacitor (20) discharges to a second voltage threshold. A switch (14) is coupled to the current mirror (12) and the trigger (22) for changing the direction of the mirrored current based on the output voltage of the trigger (22).
REFERENCES:
patent: 4714901 (1987-12-01), Jain et al.
patent: 4723114 (1988-02-01), D'Arrigo et al.
patent: 4983931 (1991-01-01), Nakano
"LM566C Voltage Controlled Oscillator," Special Purpose Linear Devices Data Book, National Semiconductor, 1989, pp. 572-575.
Fattaruso John W.
Mahant-Shetti Shivaling S.
Donaldson Richard A.
Grimm Siegfried H.
Hiller William E.
Sorensen Douglas A.
Texas Instruments Incorporated
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