Communication diode driver circuit
First Claim
1. A communication diode driver circuit (CDDC) for selectively illuminating at least one communication diode (CD) in response to incoming digital data pulses, the communication diode driver circuit comprising:
- at least one Communication Light Emitting Circuit (CLEC) having a Communication Light Emitting Branch (CLEB) with at least one CD, and designed to drive said CLEB at a nominal LED drive current IN for selectively illuminating said at least one CD,each CLEC of said at least one CLEC including a driver unit for comparing a pulsed analog data voltage ADV(t) corresponding to the incoming digital data pulses, and a variable shift voltage SV(t) for issuing a pulsed drive voltage DV(t) for driving said CLEB with a pulsed LED drive current ILED(t) for selectively illuminating said at least one CD in accordance with the incoming digital data pulses, andeach CLEC of said at least one said CLEC including a closed loop feedback unit for tapping said CLEB for continuously monitoring a pulsed monitor voltage MV(t) directly proportional to said LED drive current ILED(t) for increasing said shift voltage SV(t) up to a maximum shift voltage SVmax less than a threshold drive voltage for continuously illuminating said at least one CD after a long absence of incoming digital data pulses, except for intermittently stepwise decreasing said shift voltage SV(t) in response to each single incoming digital data pulse contributing to a LED drive current satisfying the condition ILED(t)>
IN.
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Accused Products
Abstract
A Communication Diode Driver Circuit (CDDC) for selectively illuminating communication diodes (CDs) in response to incoming digital data pulses with a LED drive current ILED(t) close to a nominal LED drive current IN therefor in a steady state operation of the CDDC. The CDDC includes a driver unit for driving the LED drive current ILED(t), and a closed loop feedback unit for continuously monitoring the LED drive current ILED(t) for providing a variable shift voltage SV(t). The driver unit includes a shift amplifier for combining a pulsed analog data voltage ADV(t) corresponding to incoming digital data pulses, and the shift voltage SV(t).
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Citations
8 Claims
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1. A communication diode driver circuit (CDDC) for selectively illuminating at least one communication diode (CD) in response to incoming digital data pulses, the communication diode driver circuit comprising:
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at least one Communication Light Emitting Circuit (CLEC) having a Communication Light Emitting Branch (CLEB) with at least one CD, and designed to drive said CLEB at a nominal LED drive current IN for selectively illuminating said at least one CD, each CLEC of said at least one CLEC including a driver unit for comparing a pulsed analog data voltage ADV(t) corresponding to the incoming digital data pulses, and a variable shift voltage SV(t) for issuing a pulsed drive voltage DV(t) for driving said CLEB with a pulsed LED drive current ILED(t) for selectively illuminating said at least one CD in accordance with the incoming digital data pulses, and each CLEC of said at least one said CLEC including a closed loop feedback unit for tapping said CLEB for continuously monitoring a pulsed monitor voltage MV(t) directly proportional to said LED drive current ILED(t) for increasing said shift voltage SV(t) up to a maximum shift voltage SVmax less than a threshold drive voltage for continuously illuminating said at least one CD after a long absence of incoming digital data pulses, except for intermittently stepwise decreasing said shift voltage SV(t) in response to each single incoming digital data pulse contributing to a LED drive current satisfying the condition ILED(t)>
IN. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification