1. A method of downconverting a received radio-frequency (RF) signal in a wireless device, comprising: receiving the RF signal at an antenna in the wireless device; amplifying the received RF signal; filtering the amplified RF signals using a filter having an impedance matching that of a mixer via a matching network; inputting the filtered, amplified RF signals as a differential input signal to a common-gate common-source (CGCS) mixer input stage; mixing the filtered, amplified RF signals to output a downconverted RF signal by: conducting the differential input signal to a common-gate stage and to a common-source stage of the CGCS mixer input stage by conducting the differential input signal to a gate and source of each transistor forming the common-gate stage and to a gate of each transistor forming the common-source stage of the CGCS mixer input stage; conducting a signal from a common current source to a source of each transistor forming the common-source stage of the CGCS mixer input stage; and conducting a signal appearing at a drain of each transistor forming the common-source stage of the CGCS mixer input stage to a corresponding drain of each transistor forming the common-gate stage of the CGCS mixer input stage; and outputting the downconverted RF signal.