Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Rectangular or pulse waveform width control
Reexamination Certificate
2006-09-27
2008-08-05
Cox, Cassandra (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Rectangular or pulse waveform width control
C327S100000
Reexamination Certificate
active
07408392
ABSTRACT:
A converter circuit and method for converting a pulse-width modulated input signal into a voltage output signal eliminates an offset due to component mismatch. The converter circuit includes at least two channels. Each channel has an operational amplifier with differential inputs and differential outputs. A first capacitor in each channel provides a negative feedback from a first output to a first input and a second capacitor in each channel provides a negative feedback from a second output to a second input. Each channel is conditioned by a switch array in response to the pulse-width modulated signal to operate in a selected one of an integration mode, a sampling mode and a reset mode. In each channel, in the integration mode, the switch array selectively connects the reference current source of first polarity either to the first or to the second input of the operational amplifier, and the reference current source of second polarity to the other of the first and second inputs. In the sampling mode, the switch array selectively disconnects the reference current sources of first and second polarity and the outputs of the operational amplifier provide the voltage output signal. In the reset mode, the switch array selectively disconnects the reference current sources of first and second polarity and short-circuits the first and second capacitors.
REFERENCES:
patent: 6208280 (2001-03-01), Baker et al.
patent: 6456051 (2002-09-01), Darzy
patent: 6844710 (2005-01-01), Lipcsei et al.
patent: 7342385 (2008-03-01), Capodivacca et al.
patent: 0734123 (1996-09-01), None
Brady III Wade J.
Cox Cassandra
Franz Warren L.
Telecky , Jr. Frederick J.
Texas Instruments Deutschland GmbH
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