Linear amplifier using non-linear cmos capacitors
AssigneeKoninklijke Philips Electronics N.V.
InventorMartin Reber
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Abstract
The invention provides an amplifier circuit made by digital CMOS processes, the amplifier circuit comprising a main operational amplifier with at least one input and at least one output and a feedback loop including a non-linear gateoxide capacitor, wherein a voltage control means is connected to the main operational amplifier to provide a voltage difference between the output common mode voltage and the input common mode voltage of the main operational amplifier to apply a DC biasing voltage across the non-linear gateoxide capacitor sufficient to operate the non-linear gateoxide capacitor in a bias range where the capacity of the none-linear gateoxide capacitor is almost independent of the applied voltage comprising the bias voltage plus a signal voltage.
Claims12
Amplifier circuit comprising a main amplifier with at least one input and at least one output and a feedback loop connected to the input and the output including a non-linear capacitor, wherein a voltage control means is connected to the main amplifier to provide a voltage difference between the output common mode voltage and the input common mode voltage of the main amplifier to apply a DC biasing voltage across the non-linear capacitor to operate the non-linear capacitor in a bias range where the capacity of the non-linear capacitor is substantially independent of the applied voltage comprising the bias voltage plus a signal voltage.
The circuit of any of the preceding claims, wherein the main amplifier circuit is made by digital CMOS processes.
Dependencies are inferred from the claim text.