PWM-to-voltage converter circuit and method

Details PWM-to-voltage converter circuit and method PWM-to-voltage converter circuit and method

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

Affiliated with

Also associated with

Rating

PWM-to-voltage converter circuit and method does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with PWM-to-voltage converter circuit and method, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and PWM-to-voltage converter circuit and method will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-4002382