Patent ID: 8798216

Claim:
A circuit comprising: a trans-admittance amplifier receiving a Radio Frequency (RF) signal and generating in response a pair of differential current signals; a trans-impedance amplifier comprising at least four mixers and at least four amplifiers, the at least four mixers down-converting a frequency of the received pair of differential current signals to generate a first differential signal pair TZ 0 having a relative phase of 0 degrees, a second differential signal pair TZ 45 having a relative phase of 45 degrees, a third differential signal pair TZ 90 having a relative phase of 90 degrees, and a fourth differential signal pair TZ 135 having a relative phase of 135 degrees, each of the four pairs of differential signals having a phase corresponding to a different phase of a local oscillator signal, each of the at least four amplifiers being associated with a different one of the four pairs of differential signals; and a summing block adapted to: generate an in-phase signal using a first weighted sum of the four differential signals; and generate a quadrature phase signal using a second weighted sum of the four differential signals, wherein the generated in-phase signal is defined substantially by TZ 0 +(√2+1) TZ 45 +(√2+1) TZ 90 +TZ 135 .