The invention relates to a mixer circuit comprising an input node for
receiving an input signal, a first output node 202, and a second output
node 203, voltage to current conversion means and switching means
operatively coupled to each other and to the input node, the first output
node and the second output node to generate a mixed input signal at the
first output node and the second output node in response to an oscillator
signal. In an embodiment the voltage to current conversion means
comprises a first and a second voltage to current converter, implemented
as N-MOSFETs M2 and M3, with their gates connected to the input node. The
drain of M2 is connected to the first output node 202, while the drain of
the M3 is connected to the second output node M3. The source of M2 is
connected to the switching node 221, while the source of M3 is connected
to the second switching node 222. The switches SW are arranged to couple
the first switching node 221 to a first supply voltage VDD and the second
switching node 222 to a second supply voltage VSS during a first phase of
the oscillator signal, and the first switching node 221 to VDD and the
second switching node 222 to VSS during a second phase of the oscillator
signal. The mixer circuit according to the invention may operate at low
supply voltages by using switches connected only to the supply voltages
VSS and VDD. Mixing is achieved by voltage to current converters GM1 and
GM2, which are alternatingly activated by the switches SW.