A circuit for wireless communication, the circuit comprising: a radio transceiver to transmit or receive a wireless communication signal with a carrier frequency; and a voltage controlled oscillator, VCO, coupled to the radio transceiver and configured to provide the transceiver with an output signal of the VCO produced across output nodes, the VCO including a transformer including a primary inductor and a secondary inductor having a same number of turns, wherein the secondary inductor is configured to be inductively coupled to the primary inductor; a capacitor bank conductively coupled to the secondary inductor, the capacitor bank to provide a majority of a total capacitance of the VCO; and a gain stage conductively coupled to the primary inductor, the gain stage to receive a supply signal and to drive a differential current in the primary inductor to induce the output signal of the VCO across the secondary inductor having a frequency equal to a resonant frequency of the VCO; wherein the primary inductor includes a first terminal and a second terminal, the secondary inductor includes a third terminal and a fourth terminal, and the gain stage includes a first transistor having a first drain and a first gate and a second transistor having a second drain and a second gate, wherein: the first drain is coupled to the first terminal; the second drain is coupled to the second terminal; the first gate is coupled to the fourth terminal; the second gate is coupled to the third terminal; and the third and fourth terminals (130, 132) comprising the output nodes (114a, 114b); and wherein the capacitor bank comprises a plurality of switched capacitors, the switched capacitors being selectively coupled between the third terminal and the fourth terminal when switched on. a radio transceiver to transmit or receive a wireless communication signal with a carrier frequency; and a voltage controlled oscillator, VCO, coupled to the radio transceiver and configured to provide the transceiver with an output signal of the VCO produced across output nodes, the VCO including a transformer including a primary inductor and a secondary inductor having a same number of turns, wherein the secondary inductor is configured to be inductively coupled to the primary inductor; a capacitor bank conductively coupled to the secondary inductor, the capacitor bank to provide a majority of a total capacitance of the VCO; and a gain stage conductively coupled to the primary inductor, the gain stage to receive a supply signal and to drive a differential current in the primary inductor to induce the output signal of the VCO across the secondary inductor having a frequency equal to a resonant frequency of the VCO; wherein the primary inductor includes a first terminal and a second terminal, the secondary inductor includes a third terminal and a fourth terminal, and the gain stage includes a first transistor having a first drain and a first gate and a second transistor having a second drain and a second gate, wherein: the first drain is coupled to the first terminal; the second drain is coupled to the second terminal; the first gate is coupled to the fourth terminal; the second gate is coupled to the third terminal; and the third and fourth terminals (130, 132) comprising the output nodes (114a, 114b); and wherein the capacitor bank comprises a plurality of switched capacitors, the switched capacitors being selectively coupled between the third terminal and the fourth terminal when switched on. a transformer including a primary inductor and a secondary inductor having a same number of turns, wherein the secondary inductor is configured to be inductively coupled to the primary inductor; a capacitor bank conductively coupled to the secondary inductor, the capacitor bank to provide a majority of a total capacitance of the VCO; and a gain stage conductively coupled to the primary inductor, the gain stage to receive a supply signal and to drive a differential current in the primary inductor to induce the output signal of the VCO across the secondary inductor having a frequency equal to a resonant frequency of the VCO; wherein the primary inductor includes a first terminal and a second terminal, the secondary inductor includes a third terminal and a fourth terminal, and the gain stage includes a first transistor having a first drain and a first gate and a second transistor having a second drain and a second gate, wherein: the first drain is coupled to the first terminal; the second drain is coupled to the second terminal; the first gate is coupled to the fourth terminal; the second gate is coupled to the third terminal; and the third and fourth terminals (130, 132) comprising the output nodes (114a, 114b); and wherein the capacitor bank comprises a plurality of switched capacitors, the switched capacitors being selectively coupled between the third terminal and the fourth terminal when switched on. the first drain is coupled to the first terminal; the second drain is coupled to the second terminal; the first gate is coupled to the fourth terminal; the second gate is coupled to the third terminal; and the third and fourth terminals (130, 132) comprising the output nodes (114a, 114b); and wherein the capacitor bank comprises a plurality of switched capacitors, the switched capacitors being selectively coupled between the third terminal and the fourth terminal when switched on.