Appeal No. 96-3902
Application 08/442,742
BACKGROUND
Claim 1 is representative of the claimed invention and reproduced below:
1. A mixed signal processing system comprising:
first regulation means coupled to first and common power supply
voltage terminals respectively providing first and common power
supply voltages thereon, for providing a second power supply voltage
at a first predetermined potential referenced to said common power
supply voltage, an absolute value of said first predetermined potential
being less than an absolute value of a nominal potential of said first
power supply voltage referenced to said common power supply
voltage and characterized as being substantially constant with
respect to changes in said first power supply voltage;
means coupled to said first and common power supply voltage
terminals, for providing a third power supply voltage at a second
predetermined potential referenced to said common power supply
voltage, an absolute value of said second predetermined potential
being greater than said absolute value of said nominal potential, and
including second regulation means for keeping said second
predetermined potential substantially constant with respect to
changes in said first power supply voltage;
a digital subsystem coupled to said common power supply voltage
terminal for receiving said second power supply voltage at a power
supply voltage terminal thereof and a digital signal at an input terminal
thereof; and
an analog subsystem coupled to said digital subsystem and to said
common power supply voltage terminal, for receiving said third power
supply voltage at a power supply voltage terminal thereof and an
analog signal at an input terminal thereof.
The present invention relates to a system for improving the operation of a mixed
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