Wireless user terminal and system having signal clipping circuit for switched capacitor sigma delta analog to digital converters

A radio frequency (RF) enabled communications system, comprising:

• a base station;
• and
• a wireless user terminal capable of communicating with said base station via radio frequency (RF) communication, said wireless user terminal further comprising:
• a digital baseband;
• an RF section;
• an analog baseband coupling said digital baseband to said RF section, wherein said analog baseband further comprises:
• a switch having a first lead coupled to an input and a second lead coupled to an analog-to-digital converter (ADC);
• a signal clipping circuit having a first input coupled to said first input of said switch, a second input coupled to receive a first reference voltage, a third input coupled to receive a second reference voltage, and an output coupled to said second lead of said switch.

A wireless user terminal having radio frequency (RF) communication capability, comprising:

• a digital baseband;
• an RF section;
• an analog baseband coupling said digital baseband to said RF section, wherein said analog baseband further circuitry for providing an analog-to-digital (ADC) function, wherein said circuitry comprises:
• a first input;
• a switch having a first lead coupled to an first input and a second lead coupled to an analog-to-digital converter (ADC);
• a second input coupled to said analog-to-digital converter (ADC), said second input being further coupled to receive an input signal;
• a signal clipping circuit having a first input coupled to said first input of said switch, a second input coupled to receive a first reference voltage, a third input coupled to receive a second reference voltage, and an output coupled to said second lead of said switch.

A wireless user terminal having radio frequency (RF) communication capability, comprising:

• circuitry for providing a digital baseband function;
• circuitry for providing an RF function;
• circuitry for providing an analog baseband function, said circuitry for providing an analog baseband function being coupled to said circuitry for providing a digital baseband function and said circuitry for providing an RF function, wherein said circuitry for providing an analog baseband function comprises:
• a first input;
• a switch having a first lead coupled to an first input and a second lead coupled to an analog-to-digital converter (ADC);
• a second input coupled to said analog-to-digital converter (ADC), said second input being further coupled to receive an input signal;
• a signal clipping circuit having a first input coupled to said first input of said switch, a second input coupled to receive a first reference voltage, a third input coupled to receive a second reference voltage, and an output coupled to said second lead of said switch.