Reference voltage generator

A reference voltage generator comprising:

• an amplifier;
• a first capacitor;
• and
• a switch controller operable to control connectivity of the first capacitor in a feedback path of the amplifier to generate a reference voltage, the switch controller operable to switch between:
• i) a first mode in which the first capacitor is absent from the feedback path of the amplifier during charging of the first capacitor, and ii) a second mode of inserting the charged first capacitor into the feedback path of the amplifier;
• the reference voltage generator further comprising:
• a second capacitor;
• a first current driver;
• a first semiconductor device;
• a second current driver;
• a second semiconductor device;
• and
• wherein, during the first mode, the switch controller is operable to:
• i) couple the first current driver to the first semiconductor device to generate a first voltage applied to a non-inverting input of the amplifier, and ii) couple the second current driver to the second semiconductor device to generate a second voltage inputted to the second capacitor, the second capacitor coupled to an inverting input of the amplifier;
• the reference voltage generator further comprising:
• a third capacitor;
• and
• wherein during the second mode, the switch controller is operable to couple the second current driver to the first semiconductor device to generate a third voltage, the third voltage being applied to the non-inverting input of the amplifier.

A reference voltage generator comprising:

• an amplifier;
• a first capacitor;
• and
• a switch controller operable to control connectivity of the first capacitor in a feedback path of the amplifier to generate a reference voltage, the switch controller operable to switch between:
• i) a first mode in which the first capacitor is absent from the feedback path of the amplifier during charging of the first capacitor, and ii) a second mode of inserting the charged first capacitor into the feedback path of the amplifier;
• the reference voltage generator further comprising:
• a second capacitor;
• a first current driver;
• a first semiconductor device;
• a second current driver;
• a second semiconductor device;
• and
• wherein, during the first mode, the switch controller is operable to:
• i) couple the first current driver to the first semiconductor device to generate a first voltage applied to a non-inverting input of the amplifier, and ii) couple the second current driver to the second semiconductor device to generate a second voltage inputted to the second capacitor, the second capacitor coupled to an inverting input of the amplifier, the method further comprising:
• a third capacitor;
• and
• wherein during the second mode, the switch controller is operable to:
• i) couple the second current driver to the first semiconductor device to generate a third voltage applied to the non-inverting input of the amplifier, and ii) couple the second capacitor in parallel with the third capacitor.

A method comprising:

• generating control signals to control a reference voltage generator, the reference voltage generator including an amplifier and a first capacitor, generation of the control signals including:
• during a first mode of controlling the reference voltage generator:
• i) producing the control signals to disconnect the first capacitor from a feedback path of the amplifier, ii) charging the first capacitor, and iii) inputting a first voltage to a non-inverting input of the amplifier;
• and
• during a second mode of controlling the reference voltage generator:
• i) inserting the first capacitor into the feedback path of the amplifier to produce a reference voltage, and ii) inputting a second voltage to the non-inverting input of the amplifier;
• wherein generating control signals includes:
• during the first mode, controlling a switch network of the reference voltage generator to:
• i) couple a first current driver of the reference voltage generator to a first semiconductor device to generate the first voltage inputted to the non-inverting input of the amplifier ii) couple a second current driver of the reference voltage generator to a second semiconductor device to generate a third voltage inputted to a second capacitor of the reference voltage generator, the second capacitor coupled between the second semiconductor device and the inverting input of the amplifier, the method further comprising:
• during the second mode, controlling the switch network of the reference voltage generator to:
• i) couple the second current driver to the first semiconductor device to generate the second voltage inputted to the non-inverting input of the amplifier, and ii) couple the second capacitor in parallel with a third capacitor of the reference voltage generator.