High performance sigma delta based analog modem front end

Details High performance sigma delta based analog modem front end High performance sigma delta based analog modem front end

H - Electricity

04

B

354/69, 328/0.7

H04B 14/06 (2006.01) H03M 3/02 (2006.01)

Patent

CA 1314629

"IMPROVED HIGH PERFORMANCE SIGMA DELTA BASED ANALOG MODEM FRONT END" Abstract An improved analog front end circuit for a high performance modem comprising an oversampling sigma delta modulator analog-to-digital converter which employs a novel four phase clocked MOSFET switched capacitor integrator. The integrator is switched in a manner as to eliminate signal dependent charges in the MOSFET switches. The sigma delta modulator shifts quantization noise of the analog-to-digital conversion process out of baseband of the analog signal. A novel integrated decimating FIR low pass filter filters the quantization noise from the digital output signals, and reduces the number of digital signals to obtain a sufficient number of signal samples in order to provide operation at high speeds, for example 9600 bps. The improved four phase switched capacitor integrator is also suitable for use in sigma delta modulator circuits, analog-to- digital converter circuits, integrating circuits, and the like. A novel return-to-zero circuit eliminates distortion in a sigma delta modulator based analog-to-digital conversion process which can result from unequal rise and fall times of the digital output, by insuring that the energies in signals represented by a "one" and signals represented by a "zero" are equal, even during portions of the bit stream wherein there is a consecutive sequence of "ones".

586437

Affiliated with

Also associated with

Rating

High performance sigma delta based analog modem front end does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with High performance sigma delta based analog modem front end, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and High performance sigma delta based analog modem front end will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFCA-PAI-O-1203021