US 2026/0291529 A1 · HARMONIC REJECTION CALIBRATION FOR PASSIVE MIXER

Abstract

A passive mixer includes an in-phase (I) mixer and a quadrature (Q) mixer configured to receive a single-ended communication signal from a low noise amplifier (LNA), an in-phase (I) local oscillator (LO) signal provided to the I mixer and a quadrature (Q) LO signal applied to the Q mixer, a first pair of I resistance banks connected to selected outputs of the I mixer, and a second pair of Q resistance banks connected to selected outputs of the Q mixer, wherein the first pair of I resistance banks comprises an I+ resistance bank having at least one adjustable I+ resistance and an I− resistance bank having at least one adjustable I− resistance, and the second pair of Q resistance banks comprises a Q+ resistance bank having at least one adjustable Q+ resistance and a Q− resistance bank having at least one adjustable Q− resistance.

Claims19

Dependent claims

A passive mixer, comprising:

an in-phase (I) mixer and a quadrature (Q) mixer configured to receive a single-ended communication signal from a low noise amplifier (LNA);
an in-phase (I) local oscillator (LO) signal provided to the I mixer and a quadrature (Q) LO signal applied to the Q mixer;
a first pair of I resistance banks connected to selected outputs of the I mixer;
and
a second pair of Q resistance banks connected to selected outputs of the Q mixer,
wherein the first pair of I resistance banks comprises an I+ resistance bank having at least one adjustable I+ resistance and an I− resistance bank having at least one adjustable I− resistance;
and
the second pair of Q resistance banks comprises a Q+ resistance bank having at least one adjustable Q+ resistance and a Q− resistance bank having at least one adjustable Q− resistance.

5 more elements

A method for harmonic signal rejection, comprising:

providing a transmit (Tx) signal and a reference tone to a low noise amplifier;
providing a single-ended communication signal from the low noise amplifier (LNA) to an in-phase (I) mixer and a quadrature (Q) mixer;
providing an in-phase (I) local oscillator (LO) signal to the I mixer and a quadrature (Q) LO signal applied to the Q mixer;
simultaneously sweeping a resistance value of at least one I+ resistance and at least one I− resistance to determine a resistance value corresponding to a maximum I harmonic rejection;
and
simultaneously sweeping a resistance value of at least one Q+ resistance and at least one Q− resistance to determine a resistance value corresponding to a maximum Q harmonic rejection.

3 more elements

An apparatus for harmonic signal rejection, comprising:

means for providing a transmit (Tx) signal and a reference tone to a low noise amplifier;
means for providing a single-ended communication signal from the low noise amplifier (LNA) to an in-phase (I) mixer and a quadrature (Q) mixer;
means for providing an in-phase (I) local oscillator (LO) signal to the I mixer and a quadrature (Q) LO signal applied to the Q mixer;
means for simultaneously sweeping a resistance value of at least one I+ resistance and at least one I− resistance to determine a resistance value corresponding to a maximum I harmonic rejection;
and
means for simultaneously sweeping a resistance value of at least one Q+ resistance and at least one Q− resistance to determine a resistance value corresponding to a maximum Q harmonic rejection.

3 more elements

Dependencies are inferred from the claim text.

Harmonic rejection calibration for passive mixer

Life of this patent

Harmonic rejection calibration for passive mixer

Life of this patent

Abstract

Claims19