Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
159 words
In combination: capacitive DAC means for capacitively coupling a charge to an output portion thereof in proportion to a voltage coupled to an input portion thereof; input switching means for coupling the input portion of the capacitive DAC means to a first reference voltage in response to a first enable signal; filter means for providing an output signal on an output portion thereof at a voltage related to the charge coupled to an input portion thereof; output switching means for coupling the output portion of the capacitive DAC means to the input portion of the filter means in response to a second enable signal, and to a second reference voltage in response to a third enable signal, and clock generator means for sequentially providing the third enable signal during a discharge period, the second enable signal during a settling period, the first and second enable signals during a sample period, and the first enable signal during a hold period.
Claim 2
Dependent Claim
159 words
In combination: capacitive DAC means for capacitively coupling a charge to an output portion thereof in proportion to a voltage coupled to an input portion thereof; input switching means for coupling the input portion of the capacitive DAC means to a first reference voltage in response to a first enable signal; filter means for providing an output signal on an output portion thereof at a voltage related to the charge coupled to an input portion thereof; output switching means for coupling the output portion of the capacitive DAC means to the input portion of the filter means in response to a second enable signal, and to a second reference voltage in response to a third enable signal, and clock generator means for sequentially providing the third enable signal during a discharge period, the second enable signal during a settling period, the first and second enable signals during a sample period, and the first enable signal during a hold period.
Claim 3
Dependent Claim
91 words
The combination of claim 1 wherein the capacitive DAC means comprise: unswitched capacitance means having an input portion coupled to the second reference voltage, and an output portion coupled to the output portion of the capacitive DAC means; switched capacitance means having an input portion coupled to the input switching means, and an output portion coupled to the output portion of the capactive DAC means; and DAC switching means for coupling the input portion of the switched capacitance means to the second reference voltage in response to the third enable signal.
Claim 4
Dependent Claim
54 words
The combination of claims 1 or 2 wherein the filter means comprise: operational amplifier means having inverting and non-inverting inputs and an output; feedback capacitance means coupled between the inverting input and the output of the operational amplifier; and feedback resistance means coupled between the inverting input and the output of the operational amplifier.
Claim 5
Independent Claim
65 words
A method of decoding an encoded signal, comprising the steps of: charging said encoded signal onto capacitance means of a D/A converter to provide a charge related to said encoded signal; and coupling said charge directly to a filter which uses said capacitance means as an input capacitor, thereby eliminating the need to convert said charge to a voltage before said encoded signal is filtered.
Claim 6
Independent Claim
65 words
A method of decoding an encoded signal, comprising the steps of: charging said encoded signal onto capacitance means of a D/A converter to provide a charge related to said encoded signal; and coupling said charge directly to a filter which uses said capacitance means as an input capacitor, thereby eliminating the need to convert said charge to a voltage before said encoded signal is filtered.