Patent ID: 11876543
Assignee: HANGZHOU GEO-CHIP TECHNOLOGY CO., LTD.
Field: Basic communication processes (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A mixer circuit comprising an I-channel digital-to-analog converter, a Q-channel digital-to-analog converter, a low-pass filter, and a passive quadrature mixer, wherein
the passive quadrature mixer is configured to generate a radio frequency signal based on an output of the I-channel digital-to-analog converter, an output of the Q-channel digital-to-analog converter and a local oscillation signal,
the low-pass filter is arranged ahead of the passive quadrature mixer, so that low-pass filtered signals are received between an I-channel non-inverting input terminal and a Q-channel non-inverting input terminal of the passive quadrature mixer and between an I-channel inverting input terminal and a Q-channel inverting input terminal of the passive quadrature mixer, respectively,
wherein the low-pass filter includes an active device, so that an output admittance of the mixer circuit contains conductance dependent of frequency,
wherein the low-pass filter comprises two voltage amplifiers that are connected in parallel between the I-channel non-inverting input terminal and the Q-channel non-inverting input terminal and have respective signal directions opposite to each other.