Oscillators – Ring oscillators
Reexamination Certificate
2006-10-31
2006-10-31
Chang, Joseph (Department: 2817)
Oscillators
Ring oscillators
C331S017000, C331S182000, C331S185000, C331S186000
Reexamination Certificate
active
07129796
ABSTRACT:
The ring oscillator circuit with the current mirror type current limit circuit of this invention prevents the malfunction and the halt of the ring oscillator. The ring oscillator is configured with the serially connected CMOS inverters INV1–INV5where the output of the last CMOS inverter INV5is fed back to the input of the first CMOS inverter INV1. Also, the current mirror type current limit circuit for controlling the electric current going through the CMOS inverters INV1–INV5is formed. The first supporting transistor T1that helps the output of the CMOS inverter INV5achieve the full-swing for reaching the power supply voltage Vdd and the second supporting transistor T2that helps the output of the CMOS inverter INV5achieve the full-swing for reaching the ground voltage Vss according to the output of the CMOS inverter INV3two positions ahead of the last inverter INV5are also formed.
REFERENCES:
patent: 5418499 (1995-05-01), Nakao
patent: 5-186474 (1993-07-01), None
patent: 08-186474 (1996-07-01), None
Chang Joseph
Gannon Levi
Morrison & Foerster / LLP
Sanyo Electric Co,. Ltd.
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