Quadrature combining and adjusting

摘要

Certain aspects of the present disclosure provide methods and apparatus for performing quadrature combining and adjusting. One example circuit may include first through fourth mixing circuits. The first mixing circuit may multiply a radio frequency signal with a first local oscillating signal to generate a first frequency converted signal. The second mixing circuit may multiply a radio frequency (RF) signal with a second local oscillating signal, which may be about 90° out of phase with the first local oscillating signal, to generate a second frequency converted signal. The third and fourth mixing circuits may multiply the RF signal with the second and first signals, respectively, to generate third and fourth frequency converted signals, respectively. A first combining circuit may combine the first and third frequency converted signals, and a second combining circuit may combine the second and fourth frequency converted signals.

主权项

1. A circuit for frequency converting and quadrature combining, comprising:
a first mixing circuit configured to multiply a radio frequency (RF) signal with a first local oscillating signal to generate a first frequency converted signal; a second mixing circuit configured to multiply the RF signal with a second local oscillating signal to generate a second frequency converted signal, wherein the second local oscillating signal is about 90° out of phase with respect to the first local oscillating signal; a third mixing circuit configured to multiply the RF signal with the second local oscillating signal to generate a third frequency converted signal; a fourth mixing circuit configured to multiply the RF signal with the first local oscillating signal to generate a fourth frequency converted signal; a first combining circuit configured to combine the first frequency converted signal with the third frequency converted signal; a second combining circuit configured to combine the second frequency converted signal with the fourth frequency converted signal; a first scaling circuit interposed between the third mixing circuit and the first combining circuit and configured to scale the third frequency converted signal to have an amplitude that is a fraction of the first frequency converted signal; and a second scaling circuit interposed between the fourth mixing circuit and the second combining circuit and configured to scale the fourth frequency converted signal to have an amplitude that is a fraction of the second frequency converted signal.