Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage
Patent
1995-06-05
1997-06-17
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
With specific source of supply or bias voltage
327537, H02J 100
Patent
active
056401221
ABSTRACT:
A bias circuit for generating a bias voltage that tracks power supply voltage variations, and that is compensated for variations in p-channel transistor and process parameters, is disclosed. The bias circuit includes a voltage divider, such as a resistor divider, that produces a ratioed voltage based on the power supply voltage to be tracked. The ratioed voltage is applied to a first input of a differential stage, the output of which is applied to an intermediate stage including a drive transistor and a load; the second input of the differential stage receives a feedback voltage from an intermediate node that is connected to the source of a p-channel modulating transistor that has its gate biased so as to be in saturation, for example at ground. The current conducted by the p-channel modulating transistor depends upon the ratioed voltage from the voltage divider, and also on its transistor characteristics. This current is applied, via an output stage, to produce a reference voltage that tracks power supply voltage variations. This reference voltage may be applied, individually or in combination with an n-channel compensated reference voltage, to an output buffer to control output drive slew rates, or to a current source.
REFERENCES:
patent: 3714543 (1973-01-01), Sahara et al.
patent: 4716307 (1987-12-01), Aoyama
patent: 5276356 (1994-01-01), Shirotori
patent: 5357149 (1994-10-01), Kimura
Callahan Timothy P.
Galanthay Theodore E.
Jorgenson Lisa K.
SGS-Thomson Microelectronics Inc.
Thoma Peter J.
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