Patent ID: 8111181

Claim:
A single-ended polar transmitting circuit comprising: a DAC; a differential-to-single-ended converter; a GmC filter, the GmC filter comprising: a first and a second gain stage; a first filter, the first filter comprising a resistor R 1 and a first capacitor C 1 ; a second filter, the second filter comprising a capacitor C 2 ; a translinear loop; a current mirror; a first switching device; wherein the first gain stage has a transconductance Gm 1 and the second gain stage has a transconductance Gm 2 ; wherein the bandwidth of the GmC filter is approximately equal to the square root of the quantity (Gm 1 *Gm 2 )/(C 1 *C 2 ); a load device; wherein the bandwidth of the GmC filter is substantially a constant value.