Patent ID: 8457586

Claim:
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 positive in-phase input, receiving the 1st oscillating signal; a negative in-phase input, receiving the 2nd oscillating signal; and a 1st inductor, coupled between the positive in-phase input and the negative in-phase input; 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 positive quadrature input, receiving the 3rd oscillating signal; a negative quadrature input, receiving the 4th oscillating signal; and a 2nd inductor, coupled between the positive quadrature input and the negative quadrature input; 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.