Constant voltage generating circuit

Details Constant voltage generating circuit Constant voltage generating circuit

1985-08-29

1987-02-24

Wong, Peter S.

Electricity: power supply or regulation systems

Self-regulating

Using a three or more terminal semiconductive device as the...

307296R, 307304, G05F 320

Patent

active

046459987

ABSTRACT:
A constant voltage generating circuit comprises a power supply terminal (1), an output terminal (2), a p-channel MOS FET (3), n-channel MOS FET's (4 and 5) and resistors (8 and 9). A node C of the resistors (8) and (9) is connected to a control terminal of the n-channel MOS FET (4), whereby the potential in the output terminal (2) is determined mainly by the threshold voltage of the n-channel MOS FETs (4) and (5), a ratio of the resistance values of the resistors (8) and (9) and a degree of conduction of the n-channel MOS FET (4). Instead of the resistors (8) and (9), n-channel MOS FET's (10 and 11) may be provided so as to compensate for the influence of power supply voltage in the output voltage by changing the impedance of the n-channel MOS FET (10) according to the change of the voltage of the power supply terminal (1).

REFERENCES:
patent: 3806742 (1974-04-01), Powell
patent: 4020367 (1977-04-01), Yamashiro et al.
patent: 4460864 (1984-07-01), Ray
"An Experimental 1Mb DRAM with On-Chip Voltage Limiter", Kiyoo Itoh. et al., ISSCC84, Digest of Technical Papers, Feb. 24, 1984, pp. 282-283.

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