CALIBRATION OF SIGNAL PROCESSING APPARATUS
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Abstract
A signal processing apparatus is provided that comprises a signal path including first and second signal processing stages for processing a signal. A switch, in a first state couples and in a second state de-couples an output of the first signal processing stage to an input of the second signal processing stage. An auxiliary stage coupled to the output of the first signal processing stage generates a control signal dependent to a DC level at the output of the first signal processing stage, on a DC level in the auxiliary stage, and indicates a DC offset at an output of the second signal processing stage. A calibration circuit, responsive to the control signal, adjusts a DC level in the signal path preceding the output of the first signal processing stage when the switch is in the second state.
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Citations
22 Claims
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1-11. -11. (canceled)
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12. A signal processing apparatus comprising:
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a signal path including first and second signal processing stages for processing a signal; a switch for, in a first state, coupling an output of the first signal processing stage to an input of the second signal processing stage, and, in a second state, de-coupling the output of the first signal processing stage from the input of the second signal processing stage; an auxiliary stage, coupled to the output of the first signal processing stage, arranged to generate a control signal dependent on a DC level at the output of the first signal processing stage and on a DC level in the auxiliary stage and indicative of a DC offset at an output of the second signal processing stage; and a calibration block for, responsive to the control signal and adapted to adjust a DC level in the signal path at a location preceding the output of the first signal processing stage when the switch means is in the second state. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A method of operating a signal processing apparatus comprising a signal path including first and second signal processing stages for processing a signal and comprising an auxiliary stage coupled to an output of the first signal processing stage, the method comprising:
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a method for processing the signal, comprising coupling the output of the first signal processing stage to an input of the second signal processing stage; and a method for calibrating the signal processing apparatus comprising; de-coupling the output of the first signal processing stage from the input of the second signal processing stage, generating in the auxiliary stage a control signal dependent on a DC level at the output of the first signal processing stage and on a DC level in the auxiliary stage and indicative of a DC offset at an output of the second signal processing stage, and adjusting, responsive to the control signal, a DC level in the signal path at a location preceding the output of the first signal processing stage.
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Specification