Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage
Reexamination Certificate
2008-01-14
2009-12-22
Zweizig, Jeffrey S (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
With specific source of supply or bias voltage
C327S513000
Reexamination Certificate
active
07636009
ABSTRACT:
There is provided a bias current generating apparatus capable of providing a bias current where a characteristic change is compensated, to one of an analog circuit and RF circuit where various characteristic changes occur according to a temperature, by generating bias currents having a plurality of temperature coefficients. The apparatus includes: a positive temperature coefficient current generator generating a positive temperature coefficient current in direct proportion to an absolute temperature; a zero temperature coefficient current generator generating a zero temperature coefficient current constant regardless of the absolute temperature; and an adjustable temperature coefficient current generator generating and outputting an adjustable temperature coefficient current by amplifying the positive temperature coefficient current by A times, amplifying the zero temperature coefficient current by B times, adding the two amplified temperature coefficient currents, wherein a temperature coefficient of the adjustable temperature coefficient current is varied by adjusting sizes of the A and B.
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patent: 6906581 (2005-06-01), Kang et al.
patent: 7301321 (2007-11-01), Uang et al.
patent: 7495505 (2009-02-01), Chang et al.
Behzad Razavi, “Design of Analog CMOS Integrated Circuits”, International Edition 2001 McGraw Hill, Chapter 11, pp. 381-382.
Hwang Hyeon Seok
Jo Byeong Hak
Na Yoo Sam
Oh Seung Min
Park Kyoung Seok
Lowe Hauptman Ham & Berner
Samsung Electro-Mechanics Co. Ltd.
Zweizig Jeffrey S
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