Variable capacitance voltage shifter and amplifier and a method for amplifying and shifting voltage

A voltage shifter comprising a capacitor and an isolator;

• the isolator is being coupled to the capacitor, the capacitor is adapted to be charged by an input signal, to receive a control signal and to provide an output signal, the capacitor comprising of:
• an insulator layer;
• a diffusion layer, coupled to the insulator layer;
• a substrate, coupled to the insulator and to the diffusion layer;
• a conductive layer, coupled to the isolator, wherein a capacitance between the conductive layer, the diffusion layer and the substrate is responsive to a the control signal and the input signal;
• and
• wherein the isolator is adapted to electrically isolate the capacitor when the capacitance of the capacitor is changed.

A voltage shifter comprising a capacitor and an isolator;

• the isolator is coupled to the capacitor;
• wherein the capacitor is comprised of a substrate, a gate and a drain;
• the gate is adapted to receive an input signal and to provide an output signal, the drain is adapted to receive a control signal,
• wherein the substrate is adapted to produce at least a first and a second electrically charged regions, in response to the control signal and to the input signal;
• wherein there is a first capacitance Cgf between the gate and the first electrically charged region, and there is a second capacitance Cgs between the gate and the second electrically charged region, Cgf and Cgs are responsive to the input signal and to the control signal and are adapted to be charged by an input signal;
• wherein a change in either one of Cgf and Cgs forces a change in the level of an output signal provided by the gate of the capacitor;
• and
• wherein the isolator is adapted to electrically isolate the capacitor when either one of Cgf and Cgs is changed.

A sigma delta modulator comprising:

• a noise shaping element, having an input and an output, the noise shaping element is adapted to receive an analog input signal, to perform a noise shaping process and provide an noise shaped signal;
• a voltage shifter, having an input and an output, the input of the voltage shifter is coupled to the output of the noise shifting element, the output of the voltage shifter is coupled to a first input of an comparator, the voltage shifter further comprises a capacitor and an isolator;
• the isolator is coupled to the capacitor, the capacitor is adapted to receive a control signal, to be charged by the noise shaped signal, and to provide an voltage shifter output signal to a comparator;
• the capacitor has a capacitance that is responsive to a level of the control signal, and a change in the capacitance of the capacitor forces a change in a level of the voltage shifter output signal, the isolator is adapted to electrically isolate the capacitor when the capacitance is changed;
• and
• a comparator, having an output for providing a sigma delta modulator output signal the output of the comparator is coupled, via a feedback loop to the noise shaping element, the comparator is adapted to receive the voltage shifter output signal, the control signal and the reference voltage and provide the sigma delta modulator output signal reflecting a comparison between the voltage shifter output signal and the reference voltage;
• the comparison is initiated by the control signal.