US 12,537,535 B2Granted

Symmetrical resistive harmonic rejection mixer (HRM)

AssigneeQUALCOMM Incorporated

InventorsRahul Singh, Mehran Bakhshiani

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Abstract

This disclosure provides systems, methods, and devices for wireless communications that support downconversion of signals with improved harmonic rejection. In a first aspect, an apparatus includes a first plurality of mixers with each mixer coupled to two oscillating signals that are 180 degrees apart in phase; a second plurality of mixers with each mixer coupled to two oscillating signals that are 180 degrees apart in phase, wherein a combined load of the first plurality of mixers and the second plurality of mixers on the plurality of oscillating signals is symmetric as to each oscillating signal of the plurality of oscillating signals; and a shared capacitor coupling the RF input to the first plurality of mixers and the second plurality of mixers. Other aspects and features are also claimed and described.

Claims20

Dependent claims

An apparatus, comprising:

a first plurality of mixers, wherein each mixer of the first plurality of mixers is configured to be coupled to two oscillating signals that are 180 degrees apart in phase from among a plurality of oscillating signals;
a second plurality of mixers, wherein each mixer of the second plurality of mixers is configured to be coupled to two oscillating signals that are 180 degrees apart in phase from among the plurality of oscillating signals,
wherein each oscillating signal of the plurality of oscillating signals is out of phase with other oscillating signals of the plurality of oscillating signals, and
wherein a combined load of the first plurality of mixers and the second plurality of mixers on the plurality of oscillating signals is symmetric as to each oscillating signal of the plurality of oscillating signals;
and
a capacitor coupled to the first plurality of mixers and the second plurality of mixers and configured for coupling a radio frequency (RF) signal to the first plurality of mixers and the second plurality of mixers.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 17/934,467Filed 22 Sep 2022
Published: US 2024/0106445 A128 Mar 2024
Granted: 27 Jan 2026
Term ends: Not estimatedThe source records don’t support an estimate.

Classification12 codes

H03L 7/20
Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop:…
H04B 1/10
Receivers: means associated with receiver for limiting or suppressing noise or interference
H03D 7/1458
With transistors: double balanced arrangements, i.e. where both input signals are differential
H03D 7/1466
With transistors: passive mixer arrangements