Capacitance circuit

A capacitance circuit including an input terminal and configured to provide an increased capacitance between the input terminal and a first reference voltage, the capacitance circuit comprising:

• a current source structure configured to provide a compensation current at the input terminal;
• a first transistor including a first control terminal and configured to provide a first load current, wherein the first transistor is coupled to the input terminal;
• a second transistor including a second control terminal;
• a capacitance amplification circuit configured to provide a capacitance amplification factor, wherein the capacitance amplification circuit is coupled between the first control terminal and the second control terminal;
• and
• a capacitor that defines a core capacitance and being coupled between the first control terminal and the input terminal,
• wherein the compensation current corresponds to the first load current during direct current operation,
• wherein the increased capacitance is based on the core capacitance and the capacitance amplification factor,
• wherein:
• the capacitance amplification factor is a variable capacitance amplification factor, and
• the capacitance amplification circuit is configured to provide the variable capacitance amplification factor,
• wherein:
• the capacitance amplification circuit comprises a plurality of capacitance amplification branches arranged in parallel, wherein:
• each of the capacitance amplification branches comprises a capacitance amplification branch resistor and a capacitance amplification branch transistor coupled in series, and
• each capacitance amplification branch transistor is configured to couple a corresponding capacitance amplification circuit branch between the first control terminal and the second control terminal, and
• wherein the variable capacitance amplification factor corresponds to a combined resistance of capacitance amplification circuit branches coupled in parallel by corresponding capacitance amplification branch transistors.