Dual function coupling system and method
First Claim
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1. A signal coupling system comprising:
- an integrated circuit having a plurality of electronic circuit elements and a plurality of externally accessible terminals connected to said circuit elements;
voltage regulating means in said integrated circuit coupled to a selected one of said plurality of terminals;
signal means, external to said integrated circuit applying a signal to the selected terminal; and
signal detecting means, within said integrated circuit, recovering said signal by detecting the response of said voltage regulating means to said signal.
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Abstract
An additional signal is supplied to an integrated circuit, including a voltage regulator and a plurality of electronic circuit elements, by impressing the signal on a terminal coupled to the voltage regulator. Circuitry in the integrated circuit recover the signal by detecting the voltage regulator response thereto. Method and apparatus with voltage regulators of shunt and series type are described.
26 Citations
14 Claims
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1. A signal coupling system comprising:
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an integrated circuit having a plurality of electronic circuit elements and a plurality of externally accessible terminals connected to said circuit elements; voltage regulating means in said integrated circuit coupled to a selected one of said plurality of terminals; signal means, external to said integrated circuit applying a signal to the selected terminal; and signal detecting means, within said integrated circuit, recovering said signal by detecting the response of said voltage regulating means to said signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. In a signal processing system including an integrated circuit having a plurality of electronic circuit elements and a limited number of externally accessible terminals, said integrated circuit including voltage regulating means coupled to one of said terminals for maintaining a substantially constant voltage across a load impedance, the method of feeding an additional signal into said integrated circuit comprising:
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applying said signal to said one terminal and causing said voltage regulating means to make a compensating response to maintain said substantially constant load voltage; and detecting the response of said voltage regulating means to said applied signal. - View Dependent Claims (12, 13, 14)
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Specification