Amplifier circuit with offset compensation
First Claim
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1. An amplifier circuit with offset compensation, comprising:
- a signal source for outputting a first measured signal in a first clock phase and a second measured signal in a second clock phase, each of the first and second measured signals having a useful component and, possibly, an offset component;
an amplifier having an input side connected to said signal source for receiving the measured signals and having an output side for carrying amplified measured signals;
an error signal demodulator connected to one of said input side and said output side of said amplifier for receiving the measured signals; and
said error signal demodulator having an output connected to an input at said input side of said amplifier for supplying the offset component in antiphase.
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Abstract
An amplifier circuit with offset compensation is particularly suited for a Hall element. In addition to the useful signal demodulation that is normally present and connected downstream of an amplifier, an error signal demodulator provides an error signal demodulation. The measured signals that are tapped off at the Hall sensor are coupled out at the input or output of the amplifier, and a demodulated error signal is fed back to the input of the amplifier. This makes it possible to reduce the drive range of the amplifier. The amplifier circuit is suitable in particular for Hall sensors that are operated in chopped mode.
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11 Claims
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1. An amplifier circuit with offset compensation, comprising:
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a signal source for outputting a first measured signal in a first clock phase and a second measured signal in a second clock phase, each of the first and second measured signals having a useful component and, possibly, an offset component;
an amplifier having an input side connected to said signal source for receiving the measured signals and having an output side for carrying amplified measured signals;
an error signal demodulator connected to one of said input side and said output side of said amplifier for receiving the measured signals; and
said error signal demodulator having an output connected to an input at said input side of said amplifier for supplying the offset component in antiphase. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification