Oscillators – Ring oscillators
Patent
1998-05-18
2000-07-11
Kinkead, Arnold
Oscillators
Ring oscillators
331 74, 331186, 331175, 331177R, 331 34, 327270, 327274, H03B 504, H03L 7099
Patent
active
060879033
ABSTRACT:
A voltage-controlled oscillator has a feedback circuit connected to the gate of a transistor which controls a current flowing through an oscillation unit. The feedback circuit applies a voltage depending on the DC voltage of an oscillated signal to the gate of the transistor. When the oscillated signal is reduced in level to lower the DC voltage, the feedback circuit lowers the voltage applied to the gate of the transistor. The current flowing through the oscillation unit is reduced to increase the level of the oscillated signal. When the oscillated signal is increased to increase the DC voltage, the feedback circuit increases the voltage applied to the gate of the transistor. The current flowing through the oscillation unit is increased to reduce the level of the oscillated signal. The feedback process prevents the voltage-controlled oscillator from operating unstably regardless of manufacturing variations of transistors from design values.
REFERENCES:
patent: 4616189 (1986-10-01), Pengue, Jr.
David Reynolds, "A 320 MHz CMOS Triple 8 bit DAC with On-Chip PLL and Hardware Cursor", IEEE Journal of Solid-State Circuits, vol. 29. No. 12, Dec. 1994, pp. 1545-1551.
Kinkead Arnold
NEC Corporation
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