Patent ID: 8457586
Filing Date: 2013-06-04
Classification: H03D

Abstract:
1. An RF (Radio Frequency) circuit, comprising: a transformer, receiving an RF signal so as to generate a pair of transformed signals; a local oscillator, generating a 1st oscillating signal, a 2nd oscillating signal, a 3rd oscillating signal, and a 4th oscillating signal according to a local oscillating signal; a 1st mixer, generating a 1st mixed signal according to the pair of transformed signals and the 1st and 2nd oscillating signals, and comprising: a 2nd mixer, generating a 2nd mixed signal according to the pair of transformed signals and the 3rd and 4th oscillating signals, and comprising: a 1st VGA (Variable Gain Amplifier), generating a mid-band in-phase differential signal; and a 2nd VGA, generating a mid-band quadrature differential signal.