Electronic digital logic circuitry – Interface – Supply voltage level shifting
Patent
1999-05-20
2000-09-05
Nelms, David
Electronic digital logic circuitry
Interface
Supply voltage level shifting
326 68, H03K 190175
Patent
active
061148768
ABSTRACT:
A voltage translator uses an n-channel translator transistor to translate an input voltage at its drain to an output voltage at its source. The gate and substrate of the translator transistor are each biased by charge pumps. A reference transistor is also biased by the charge pumps. A reference input voltage is translated to a reference output voltage by the reference transistor. The reference output voltage is compared to a target output voltage by comparators. When the reference output voltage is below the target, the gate charge pump is turned on, raising the gate voltage to both the reference and translator transistors. The higher gate voltage VGATE raises the output voltage VOUT since VOUT=VGATE-VT for a transistor in saturation. When the reference output voltage is above the target, the substrate charge pump is turned on, pulling the substrate bias voltage below ground. The body effect causes the transistor threshold VT to increase as the substrate is pumped. The higher threshold lowers the output voltage. Once the reference output voltage reaches the target, the charge pumps turn off. The input voltage can toggle high and low since the reference transistor sets the gate and substrate voltages.
REFERENCES:
patent: 4631421 (1986-12-01), Inoue et al.
patent: 5003197 (1991-03-01), Nojima et al.
patent: 5113088 (1992-05-01), Yammamoto et al.
patent: 5602500 (1997-02-01), Fournel
patent: 5649965 (1997-07-01), Pons et al.
patent: 5670907 (1997-09-01), Gorecki et al.
patent: 5742195 (1998-04-01), Mizuno et al.
patent: 5751168 (1998-05-01), Speed, III et al.
patent: 5783956 (1998-07-01), Ooishi
patent: 5870573 (1999-02-01), Johnson
patent: 6020762 (2000-02-01), Wilford
Hui Alex Chi-Ming
Kwong David
Auvinen Stuart T.
Lam David
Nelms David
Pericom Semiconductor Corp.
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