Compensation circuit
AssigneeHoneywell International Inc.
InventorJohn K. Tillotson
Life of this patent
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Abstract
A device for adjusting a signal to a thermally sensitive bridge circuit that may have an impedance coupled to the bridge circuit and an impedance circuit also coupled to the bridge circuit. The impedance circuit may incorporate an amplifier having a non-inverting input coupled to the bridge circuit, a signal adjusting circuit coupled to the output terminal of the amplifier and to the bridge circuit, and an amplifier circuit coupled to the output of the amplifier. The signal adjusting circuit may include a unidirectional current flow mechanism such as a diode.
Claims20
A device for adjusting a signal to a thermally sensitive bridge circuit, the device comprising:
- a first impedance having a first terminal coupled to a terminal of the bridge circuit;
- and
- an impedance circuit coupled to the terminal of the bridge circuit, the impedance circuit comprising:
- an amplifier having a non-inverting input terminal coupled to the terminal of the bridge circuit, an inverting input terminal, and an output terminal;
- a signal adjusting circuit having a second impedance with a first terminal coupled to the output terminal of the amplifier and a second terminal coupled to the terminal of the bridge circuit, the second impedance incorporating a unidirectional conductor, such as a diode;
- and
- an amplifier circuit having a third impedance with a terminal coupled to the output terminal of the amplifier.
A compensation circuit for a piezo-resistive bridge circuit having an output terminal coupled to a bridge output node and a first impedance having a terminal coupled to the bridge output node, the compensation circuit comprising:
- an amplifier having a non-inverting input terminal coupled to the bridge output node, an inverting input terminal coupled to an inverting input node, and an amplifier output terminal coupled to an amplifier output node;
- a negative feedback loop having a second impedance with a first terminal coupled to the inverting input node and a second terminal coupled to the amplifier output node;
- and
- a positive feedback loop having a third impedance with a first terminal coupled to the bridge output node and a second terminal coupled to the amplifier output node, the third impedance incorporating a diode such that exceeding a forward threshold voltage of the diode allows current to flow from the amplifier output node through the positive feedback loop to the bridge output node.
A compensation circuit for a piezo-resistive bridge circuit, the compensation circuit comprising:
- a first impedance having a terminal coupled to a bridge output node that is also coupled to a terminal of the piezo-resistive bridge circuit;
- an operational-amplifier having a non-inverting input terminal coupled to the bridge output node, an inverting input terminal coupled to an inverting input node, and an operational-amplifier output terminal coupled to an amplifier output node;
- a negative feedback loop having a second impedance with a first terminal coupled to the inverting input node and a second terminal coupled to the amplifier output node;
- and
- a positive feedback loop having a third impedance with a first terminal coupled to the bridge output node and a second terminal coupled to the amplifier output node, the third impedance incorporating a diode such that exceeding a forward threshold voltage of the diode allows current to flow from the amplifier output node through the positive feedback loop to the bridge output node.
Dependencies are inferred from the claim text.