Receiver having integrated mixer and Sigma-Delta analog-to digital conversion

A receiver comprising:

• a mixer (MX) for mixing an oscillator signal (LO2) with a carrier signal (IF) modulated by an information signal, and
• an analog-to-digital converter for converting the information signal to a digital signal (DS), wherein the analog-to-digital converter is a Sigma-Delta Modulator comprising:
• an input stage (DRVR, MX) for coupling the information signal to an input (IT1, IT2) of a continuous-time loop filter (F1, F2),
• a quantizer (Q) for quantizing an output signal of the loop filter (F1, F2) and for generating the digital signal (DS), and
• a digital-to-analog converter (DAC) for feeding back the digital signal (DS) to the input (IT1, IT2) of the continuous-time loop filter (F1, F2), the input stage comprising the mixer (MX) and having a first input (IF) for receiving the carrier signal, a second input (LO) for receiving the oscillator signal (LO2) and an output coupled to the input (IT1, IT2) of the continuous-time loop filter (F1, F2) for providing the information signal to the continuous-time loop filter (F1, F2),
• wherein the continuous-time loop filter comprises a balanced integrator (F1) having an inverting and a non-inverting input terminal connected to respective terminals (IT1, IT2) of the input of the continuous-time loop filter, and wherein the input stage comprises means (DRVR) for converting the carrier signal to a balanced carrier signal and means (SW1, SW2, SW3, SW4) for alternately coupling and cross-coupling the balanced carrier signal to the respective terminals (IT1, IT2) of the input of the continuous-time loop filter in response to the oscillator signal (LO2).