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US 2024/0186948 A1Published application
Switched capacitor based harmonic rejection mixer with the clocks having two different duty cycles
AssigneeNewracom, Inc.
InventorsSeong-Sik MYOUNG, Jonghoon PARK, Chang Hun SONG, Haejoon YANG
Life of this patent
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Abstract
A harmonic rejection mixer that uses switched capacitors for amplitude control and uses two different duty cycle local oscillator (LO) signals for phase control for each harmonic. The harmonic rejection mixer uses 2-vector variable duty harmonic rejection. which allows for the harmonic rejection mixer to be less complex. consume less power, and/or use less components/space compared to conventional harmonic rejection mixers.
Claims15
A radio frequency (RF) transmitter comprising:
- a harmonic rejection mixer comprising:
- a first switch to receive an I-path differential baseband input signal, wherein the first switch is to be controlled by a first I-path differential local oscillator (LO) signal having a 50 percent duty cycle;
- a second switch to receive the I-path differential baseband input signal, wherein the second switch is to be controlled by a second I-path differential LO signal having a 25 percent duty cycle;
- a third switch to receive a Q-path differential baseband input signal, wherein the third switch is to be controlled by a first Q-path differential LO signal having a 25 percent duty cycle;
- a fourth switch to receive the Q-path differential baseband input signal, wherein the fourth switch is to be controlled by a second Q-path differential LO signal having a 50 percent duty cycle;
- a first output capacitor coupled to the first switch, wherein the first output capacitor has a first capacitance;
- a second output capacitor coupled to the second switch and the third switch, wherein the second output capacitor has a second capacitance that is larger than the first capacitance by a multiple of a scaling factor;
- and
- a third output capacitor coupled to the fourth switch, wherein the third output capacitor has the first capacitance.
6 more elements
A harmonic rejection mixer comprising:
- a first switch to receive an I-path differential baseband input signal, wherein the first switch is to be controlled by a first I-path differential local oscillator (LO) signal having a 50 percent duty cycle;
- a second switch to receive the I-path differential baseband input signal, wherein the second switch is to be controlled by a second I-path differential LO signal having a 25 percent duty cycle;
- a third switch to receive a Q-path differential baseband input signal, wherein the third switch is to be controlled by a first Q-path differential LO signal having a 25 percent duty cycle;
- a fourth switch to receive the Q-path differential baseband input signal, wherein the fourth switch is to be controlled by a second Q-path differential LO signal having a 50 percent duty cycle;
- a first output capacitor coupled to the first switch, wherein the first output capacitor has a first capacitance;
- a second output capacitor coupled to the second switch and the third switch, wherein the second output capacitor has a second capacitance that is larger than the first capacitance by a multiple of a scaling factor;
- and
- a third output capacitor coupled to the fourth switch, wherein the third output capacitor has the first capacitance.
5 more elements
Dependencies are inferred from the claim text.