System for matched and isolated references
First Claim
Patent Images
1. A reference current generator comprising:
- a primary reference generator operative to produce a first reference current;
a duplicate reference generator operative to produce a second reference current; and
an adjustment circuit coupled to the primary reference generator and the duplicate reference generator and configured such that the first reference current is substantially matched to and isolated from the second reference current.
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Abstract
A reference current generator configured to produce matched and isolated current references is disclosed. The reference current generator includes a primary reference generator operative to produce a first reference current. The reference current generator further includes a duplicate reference generator operative to produce a second reference current. An adjustment circuit coupled to the primary reference generator and the duplicate reference generator is configured such that the first reference current is substantially matched to and isolated from the second reference current.
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Citations
11 Claims
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1. A reference current generator comprising:
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a primary reference generator operative to produce a first reference current; a duplicate reference generator operative to produce a second reference current; and an adjustment circuit coupled to the primary reference generator and the duplicate reference generator and configured such that the first reference current is substantially matched to and isolated from the second reference current. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for generating matched current references, comprising:
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generating a primary reference current in response to a reference voltage; producing a comparison voltage based upon a comparison of the reference voltage and a mirrored voltage related to the primary reference current; adjusting a value of a digital control word in accordance with the comparison voltage; providing a compensation voltage based upon the digital control word; and adjusting a duplicate reference current in accordance with the compensation voltage so as to match the duplicate reference current to the primary reference current. - View Dependent Claims (8)
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9. A reference current generator apparatus comprising:
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a primary reference generator circuit disposed to produce a first reference current; a duplicate reference generator circuit disposed to produce a second reference current based on the first reference current; and an adjustment circuit coupled to the primary reference generator and the duplicate reference generator to isolate and digitally match the primary reference generator and duplicate reference generator, said digital adjustment circuit including; a register; a primary mirror transistor disposed to mirror a current in the primary reference generator; an adjustment circuit resistor coupled to the primary mirror transistor; a comparator circuit coupled to the primary circuit mirror transistor and an input of the register; a first digital to analog converter coupled to an output of the register and the adjustment circuit resistor; and a second digital to analog converter coupled to the output of the register and the duplicate reference generator. - View Dependent Claims (10, 11)
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Specification