Radio frequency apparatus

Abstract

The radio frequency (RF) device includes a power amplifier circuit, a signal coupling circuit, an extraction circuit, and a harmonic filter circuit. The power amplifier circuit outputs a signal to be filtered. The signal coupling circuit receives the signal to be filtered through a primary-side inductor and outputs a single-ended signal through a secondary-side inductor. The extraction circuit includes a first capacitor and a second capacitor. One end of the first capacitor is coupled to one end of the primary-side inductor, and one end of the second capacitor is coupled to the other end of the primary-side inductor, so that differential-mode signals are output from the other ends of the first and second capacitors, respectively. The harmonic filter circuit performs harmonic filtering on the single-ended signal based on the differential-mode signal, so that the secondary-side inductor of the signal coupling circuit outputs a filtered signal.

Claims

1. A radio frequency device, comprising: a power amplifier circuit for amplifying a differential input signal to output a signal to be filtered; a signal coupling circuit including a primary inductor and a secondary inductor, the signal coupling circuit being used to receive the signal to be filtered through the primary inductor and output a single-ended signal through the secondary inductor; an extraction circuit including a first capacitor and a second capacitor, one end of the first capacitor being coupled to one end of the primary inductor and one end of the second capacitor being coupled to the other end of the primary inductor, to output a differential signal from the other end of the first capacitor and the other end of the second capacitor respectively; and a harmonic filtering circuit for performing harmonic filtering on the single-ended signal based on the differential signal, so that the secondary inductor of the signal coupling circuit outputs a filtered signal.

2. The radio frequency device as described in claim 1, wherein, The harmonic filtering circuit includes: a first amplifier circuit coupled to the other end of the first capacitor for outputting a first amplified signal at a first phase; a second amplifier circuit coupled to the other end of the second capacitor for outputting a second amplified signal at a second phase; and a resonant circuit for coupling the single-ended signal to the first amplified signal at the first phase of the differential-mode signal, and coupling the single-ended signal to the second amplified signal at the second phase of the differential-mode signal, so as to perform harmonic filtering on the single-ended signal.

3. The radio frequency device as described in claim 2, wherein, The resonant circuit includes a resonant inductor, the two ends of which are coupled to the extraction circuit. The first amplifier circuit and the second amplifier circuit respectively constitute an inverting amplifier circuit. The direction of the magnetic field generated by the resonant inductor is opposite to the direction of the magnetic field generated by the primary inductor.

4. The radio frequency device as described in claim 2, wherein, The resonant circuit includes a resonant inductor, the two ends of which are coupled to the extraction circuit. The resonant frequency formed by the resonant inductor and the extraction circuit is an odd multiple of the fundamental frequency of the primary inductor, which is the main operating frequency of the radio frequency device.

5. The radio frequency device as described in claim 1, wherein, The primary inductor of the signal coupling circuit has a first conductive layer pattern, which is wound from a first starting point around a winding center to a first ending point. The secondary inductor of the signal coupling circuit has a second conductive layer pattern, which is wound around the winding center and coupled to the first conductive layer pattern. The harmonic filter circuit includes a resonant inductor, which has a third conductive layer pattern, which is wound from a second starting point around the winding center to a second ending point. The second starting point is used to couple to the first starting point and the second ending point is used to couple to the first ending point. The third conductive layer pattern is a linearly symmetrical pattern with respect to a central axis. The first conductive layer pattern, the second conductive layer pattern, and the third conductive layer pattern form an inductor device.

6. The radio frequency device as claimed in claim 5, wherein the inductor device further comprises: the first capacitor, one end of which is coupled to the first starting point of the first conductive layer pattern; a first amplification circuit coupled to the other end of the first capacitor and coupled to the second starting point of the third conductive layer pattern; the second capacitor, one end of which is coupled to the first ending point of the first conductive layer pattern; and a second amplification circuit coupled to the other end of the second capacitor and coupled to the second ending point of the third conductive layer pattern.

7. The radio frequency device as claimed in claim 5, wherein the first conductive layer pattern of the inductor has a first central tap for coupling to a system power supply, the third conductive layer pattern has a second central tap for coupling to the system power supply, and the first central tap and the second central tap are substantially located on the central axis.

8. The radio frequency device as claimed in claim 7, wherein the third conductive layer pattern of the inductor is wound from the second starting point along a winding direction to the second central tap, and from the second ending point along the reverse of the winding direction to the second central tap.

9. The radio frequency device as claimed in claim 8, wherein the first conductive layer pattern of the inductor is wound from the first starting point along the winding direction to the first central tap, and from the first ending point in the opposite direction of the winding direction to the first central tap.

10. The radio frequency device as claimed in claim 5, wherein the first conductive layer pattern and the second conductive layer pattern of the inductor device surround the third conductive layer pattern.

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