Method and apparatus for precise modulation of a reference curre

Electricity: power supply or regulation systems – Self-regulating – Using a three or more terminal semiconductive device as the...

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363 73, 327103, 327530, G05F 320, H03K 301

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active

053672488

ABSTRACT:
The invention provides a method and apparatus for precise modulation of a reference current. A current generating apparatus in accordance with the invention is provided on an integrated circuit chip and includes a series connected chain comprising in the recited order: (a) an externally-set reference current source; (b) a current-to-voltage (I/V) converter for converting the reference current into an on-chip reference voltage, V.sub.ref ; (c) a voltage-to-current (V/I) converter for converting the reference voltage V.sub.ref into an on-chip, internal reference current I.sub.iref ; (d) a single-ended, voltage-operated current switch for modulating the internal reference current I.sub.iref to produce therefrom a modulated current signal, I.sub.M ; (e) a current-driven filter which receives the modulated current signal I.sub.M and produces therefrom a filtered voltage signal, V.sub.F ; (f) a voltage-to-current (V/I) converter for converting the filtered output voltage signal V.sub.F of the filter back into a current, I.sub.F, and (g) a current multiplier for multiplying the magnitude of the current output by the V/I converter to thereby produce an output current, I.sub.OUT.

REFERENCES:
patent: Re29619 (1978-04-01), Pastoriza
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patent: 4461991 (1984-07-01), Smith
patent: 4862015 (1989-08-01), Grandfield
patent: 4999567 (1991-03-01), Morigami
patent: 5054890 (1991-10-01), Yoshikawa et al.
patent: 5223743 (1993-06-01), Nakagawara
Robert Amantea, "Voltage-to-current Converter", May 28, 1980, RCA Technical Notes, TN No. 1242.

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