Simultaneous common-mode and differential mode offset compensation in analog circuits
AssigneeBAE Systems Information and Electronic Systems Integration Inc.
InventorGary M. Madison
Life of this patent
Estimating the term…
Abstract
An amplifier circuit includes an amplifier configured to produce two output voltages based on two input voltages; a first capacitor and a second capacitor each coupled to inputs of the amplifier; and a calibration circuit configured, while operating in a calibration mode, to cause each of the two output voltages to equal a reference voltage and to concurrently charge the first capacitor and a second capacitor, the first capacitor and the second capacitor each coupled to a first input of the amplifier and a second input of the amplifier, respectively.
Claims20
An amplifier circuit comprising:
- an amplifier having a first input and a second input each configured to receive an input signal, and a first output and a second output each configured to produce an output signal based on the input signal;
- a first capacitor coupled to the first input of the amplifier;
- a second capacitor coupled to the second input of the amplifier;
- and
- a calibration circuit having a first terminal coupled to the first input of the amplifier, a second terminal coupled to the second input of the amplifier, a third terminal coupled to the first output of the amplifier, a fourth terminal coupled to the second output of the amplifier, and a fifth terminal configured to receive a reference voltage.
A method of compensating for a bias voltage of an amplifier, the method comprising:
- comparing, while operating in a calibration mode, each of two output voltages of the amplifier to a reference voltage to obtain voltage differences between each of the output voltages and the reference voltage;
- and
- causing, while operating in the calibration mode, each of two input voltages to the amplifier to change such that each of the two output voltages of the amplifier equal the reference voltage.
An amplifier circuit comprising:
- an amplifier configured to produce two output voltages based on two input voltages;
- a first capacitor and a second capacitor each coupled to inputs of the amplifier;
- and
- a calibration circuit configured, while operating in a calibration mode, to cause each of the two output voltages to equal a reference voltage and to concurrently charge the first capacitor and a second capacitor, the first capacitor and the second capacitor each coupled to a first input of the amplifier and a second input of the amplifier, respectively.
Dependencies are inferred from the claim text.