An electrical circuit (10) is provided. The electrical circuit can have an input terminal (12) to receive an input
signal and an output terminal (20) at which an output
signal can be provided. The electrical circuit further comprises, a
local oscillator (14), a first mixer (16), a second mixer (18), and a
delay element (22). In the electrical circuit the first mixer is configured to receive an input
signal from the input terminal and to mix the input signal with a
local oscillator signal. Also, the second mixer is configured to receive said input signal from the input terminal and to mix the input signal with a delayed
local oscillator signal, where the delayed
local oscillator signal is said
local oscillator signal fed via the
delay element to the second mixer. The electrical circuit is configured to combine the output signal from the first mixer with the output signal from the second mixer to form an output signal at the output terminal. Hereby, an electrical circuit is provided thatcan efficiently
handle the non-idealities of a local oscillator, LO, signal in receivers or transmitters. This is achieved by the electrical circuit that uses a form of
finite impulse response, FIR,filter mixer. For example, in receivers, the electrical circuit can be used to filter
harmonic components of a pulse-shaped LO signal, resulting in attenuation of the unwanted
harmonic down-conversionproducts. The electrical circuit can also be used in other applications, such as but not limited to, filtering of the quantization
noise or spurious tones of a digitally generated LO signal.