Exponential current generator and method

An apparatus and method of generating a current pair Ip, Im where the ratio of the pair is exponentially related to a control signal, and where either Ip or Im is greater than or less than a minimum or maximum value includes a feedback correction circuit used to sense the value of Im or Ip. The corr...

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Bibliographische Detailangaben
Hauptverfasser:	WALKER BRETT CHRISTOPHER, GAZZERRO PETER C
Format:	Patent
Sprache:	eng
Schlagworte:	AMPLIFIERS ANALOGUE COMPUTERS BASIC ELECTRONIC CIRCUITRY CALCULATING COMPUTING CONTROL OF AMPLIFICATION COUNTING ELECTRICITY PHYSICS
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Beschreibung
Zusammenfassung:	An apparatus and method of generating a current pair Ip, Im where the ratio of the pair is exponentially related to a control signal, and where either Ip or Im is greater than or less than a minimum or maximum value includes a feedback correction circuit used to sense the value of Im or Ip. The correction circuit supplies a boost current Iboost when the sensed value of Ip or Im is less than or greater than the minimum or maximum value. Iboost is preferably maintained proportional to the difference of the desired value and Ip or Im.