Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage
Reexamination Certificate
2007-03-20
2007-03-20
Le, Dinh T. (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
With specific source of supply or bias voltage
C327S538000, C327S541000
Reexamination Certificate
active
10887057
ABSTRACT:
A bandgap voltage reference circuit (1) produces a bandgap voltage reference (Vref) on an output terminal (3) relative to a common ground voltage terminal (4). The circuit (1) develops a PTAT voltage across a primary resistor (r3) which is reflected and gained up across an output resistor (r4) and summed with a CTAT voltage to produce the voltage reference (Vref). A first circuit comprising a PTAT voltage cell (15) having first and second transistor stacks of first and second transistors (Q1,Q2) and (Q3,Q4) operated at different current densities develops a PTAT (2ΔVbe) across a first resistor (r1). The PTAT voltage developed across the first resistor (r1) is applied to an inverting input of a first op-amp (A1), the output of which is coupled to a first end (9) of the primary resistor (r3). A first voltage level relative to the ground terminal (4) is applied to the first end (9) of the primary resistor (r3) through a feedback loop of the first op-amp (A1) having a second resistor (r2) and a third transistor (Q5), similar to the first transistors (Q1,Q2). A second end (11) of the primary resistor (r3) is held at a second voltage level of one first base-emitter voltage relative to the ground terminal (4) by a second op-amp (A2) so that a PTAT voltage is developed across the primary resistor (r3) by the difference of the first voltage level and the second voltage level. The PTAT voltage developed across the primary resistor (r3) is reflected and gained up across the output resistor (r4) in a negative feedback loop (20) of the second op-amp (A2) and is summed with the first base-emitter voltage derived from the first transistor (Q2) to produce the bandgap voltage reference (Vref) on the output terminal3, which is given by the equation:Vref=Vbe(1)+2ΔVbe(1+r2r1)r4r3FIG. 5to accompany the abstract.
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Analog Devices Inc.
Le Dinh T.
Wolf Greenfield & Sacks P.C.
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