Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage
Patent
1996-06-19
1998-08-18
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
With specific source of supply or bias voltage
327513, G05F 110
Patent
active
057962944
ABSTRACT:
A current reference cell is used to generate stable currents using a voltage reference source such as a band gap reference voltage in order that the output current I.sub.out can be proportional to absolute temperature, making the reference cell suitable for providing the bias current of a bipolar transistor in order that dynamic changes of collector current will be proportional to corresponding changes of base emitter voltage irrespective of temperature. The invention is concerned with rapidly turning off such a current I.sub.out, and a switch such as transistor Q7 is provided which is put into saturation when the reference voltage and hence reference cell are turned off, in order that current decaying via any large capacitor such as C1 connected to the output of the reference cell is diverted through such a switch rather than through the reference cell.
REFERENCES:
patent: 4902915 (1990-02-01), Tran
patent: 5408136 (1995-04-01), Ovens et al.
patent: 5459427 (1995-10-01), Chambers et al.
patent: 5578960 (1996-11-01), Matsumura et al.
patent: 5614815 (1997-03-01), Yamagata et al.
Callahan Timothy P.
Nu Ton My-Trang
Plessey Semiconductors Limited
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