A method and apparatus for sensing a common mode feedback current are provided. The common mode feedback current may flow through a common mode resistive divider of a piezoresistive bridge. A first current mirror mirrors the common mode feedback current and provides a first mirrored common mode current. A current aggregation stage receives the first mirrored common mode current and determines a bridge current of the piezoresistive bridge based on the first mirrored common mode feedback current. A second current mirror may be used to mirror the first current mirror before determining the bridge current.

A method and apparatus for sensing a common mode feedback current are provided. The common mode feedback current may flow through a common mode resistive divider of a piezoresistive bridge. A first current mirror mirrors the common mode feedback current and provides a first mirrored common mode current. A current aggregation stage receives the first mirrored common mode current and determines a bridge current of the piezoresistive bridge based on the first mirrored common mode feedback current. A second current mirror may be used to mirror the first current mirror before determining the bridge current.

A comparator includes a folded cascode stage having positive and negative outputs. The folded cascode stage includes: a common-mode voltage regulation circuit that includes resistive elements that are respectively situated between each of the outputs and a common-mode node. A compensation circuit is configured to regulate a difference between the voltages on the outputs, and is configured to generate a constant and continuous compensation current in the two resistive elements. A hysteresis circuit is configured to offset voltages on the outputs, and to generate a hysteresis current in the two resistive elements.

A comparator includes a folded cascode stage having positive and negative outputs. The folded cascode stage includes: a common-mode voltage regulation circuit that includes resistive elements that are respectively situated between each of the outputs and a common-mode node. A compensation circuit is configured to regulate a difference between the voltages on the outputs, and is configured to generate a constant and continuous compensation current in the two resistive elements. A hysteresis circuit is configured to offset voltages on the outputs, and to generate a hysteresis current in the two resistive elements.

According to one embodiment, a voltage-current conversion circuit includes an amplifier first, second and third inputs, a transistor including a first and second terminals, and a control terminal electrically connected to an output of the amplifier, and a serial connection including resistors connected in series between the first terminal and an ac ground, wherein a predetermined connecting point, among a first connecting point between the first terminal and the serial connection, a second connecting point between the ac ground and the serial connection, and one or more third connecting points between the resistors, is connected to the second input, and one of the connecting points other than the predetermined connecting point is connected to the third input.

According to one embodiment, a voltage-current conversion circuit includes an amplifier first, second and third inputs, a transistor including a first and second terminals, and a control terminal electrically connected to an output of the amplifier, and a serial connection including resistors connected in series between the first terminal and an ac ground, wherein a predetermined connecting point, among a first connecting point between the first terminal and the serial connection, a second connecting point between the ac ground and the serial connection, and one or more third connecting points between the resistors, is connected to the second input, and one of the connecting points other than the predetermined connecting point is connected to the third input.