# US 12,119,802 B2 · Radio frequency transceiver device

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- Number: US 12,119,802 B2
- Document ID: US12119802B2
- Status: Granted
- Kind: B2
- Application number: 17/830,970
- Filed: 2022-06-02
- Published: 2023-06-22
- Granted: 2024-10-15
- Earliest claimed: 2021-12-22
- Assignees: Realtek Semiconductor Corp.
- Applicants: Realtek Semiconductor Corp.
- Inventors: Chia-Yi Lee; Kuan-Yu Shih; Chia-Jun Chang
- Web page: https://patentgrep.com/patent/US12119802B2

## CPC

- H03H 7/38: Impedance-matching networks
- H03F 1/3205: {in field-effect transistor amplifiers}
- H03F 1/565: {using inductive elements}
- H03F 3/19: with semiconductor devices only
- H03F 3/195: in integrated circuits
- H03F 3/245: {with semiconductor devices only}
- H04B 1/0458: {Arrangements for matching and coupling between power amplifier and antenna or between amplifying stages (matching circuits in general H03H)}
- H04B 1/18: Input circuits, e.g. for coupling to an antenna or a transmission line (coupling networks between antennas or lines and receivers independent of the nature of the receiver H03H)
- H04B 1/44: Transmit/receive switching
- H04B 1/525: with means for reducing leakage of transmitter signal into the receiver
- H03F 2200/294: the amplifier being a low noise amplifier [LNA]
- H03F 2200/451: the amplifier being a radio frequency amplifier
- H03F 2200/537: A transformer being used as coupling element between two amplifying stages
- H03F 2200/541: Transformer coupled at the output of an amplifier
- H03H: IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS (waveguides, resonators, lines or other devices of the waveguide type H01P)
- H03F: AMPLIFIERS
- H04B: TRANSMISSION

## Abstract

A radio frequency transceiver device includes an antenna unit, a first matching circuit, a receiver circuit, a second matching circuit, a transmitter circuit, and an auxiliary circuit. The receiver circuit includes a mixer unit. The auxiliary circuit includes a first transformer coil and a second transformer coil. The first matching circuit and the receiver circuit are configured to form a first signal reception channel to receive, process, and transmit the first radio frequency signal to the mixer unit when the first radio frequency signal is a high gain radio frequency signal. The second matching circuit and the auxiliary circuit are configured to form a second signal reception channel to receive, process, and transmit the first radio frequency signal to the mixer unit when the first radio frequency signal is a middle-low gain radio frequency signal. Another radio frequency signal transceiver device further includes a third matching circuit.

## Claims

### Claim 1

A radio frequency transceiver device comprising:
an antenna unit configured to receive a first radio frequency signal or transmit a second radio frequency signal;
a first matching circuit coupled to the antenna unit;
a receiver circuit coupled to the first matching circuit and comprising a mixer unit;
a second matching circuit coupled to the antenna unit;
a transmitter circuit coupled to the second matching circuit, wherein the second matching circuit and the transmitter circuit form a signal transmission channel configured to transmit the second radio frequency signal; and
an auxiliary circuit comprising a first transformer coil and a second transformer coil, wherein the first transformer coil is coupled between the second matching circuit and the transmitter circuit, and the second transformer coil is coupled to the mixer unit;
wherein the first matching circuit and the receiver circuit are configured to form a first signal reception channel: when the first radio frequency signal is a high gain radio frequency signal, the first signal reception channel receives and processes the first radio frequency signal and then transmits the first radio frequency signal to the mixer unit; the second matching circuit and the auxiliary circuit are configured to form a second signal reception channel: when the first radio frequency signal is a middle-low gain radio frequency signal, the second signal reception channel receives the first radio frequency signal and then transmits the first radio frequency signal to the mixer unit.

### Claim 2 (depends on 1)

The radio frequency transceiver device according to claim 1, wherein a turns ratio of the first transformer coil to the second transformer coil is determined by a first impedance and a second impedance: the first impedance is the equivalent impedance looking into the transmitter circuit seen by the first transformer coil, and the second impedance is the equivalent impedance looking into the mixer unit seen by the second transformer coil.

### Claim 3 (depends on 2)

The radio frequency transceiver device according to claim 2, wherein the turns ratio is the square root of the ratio of the first impedance to the second impedance.

### Claim 4 (depends on 1)

The radio frequency transceiver device according to claim 1, wherein the receiver circuit further comprises:
a low-noise amplifier coupled to the first matching circuit, wherein the low-noise amplifier is configured to receive and amplify the first radio frequency signal matched by the first matching circuit when the first radio frequency signal is the high gain radio frequency signal.

### Claim 5 (depends on 4)

The radio frequency transceiver device according to claim 4, wherein the mixer unit comprises a first mixer coupled to the low-noise amplifier, and the second transformer coil is coupled between the first mixer and the low-noise amplifier.

### Claim 6 (depends on 4)

The radio frequency transceiver device according to claim 4, wherein the mixer unit comprises a first mixer and a second mixer, the first mixer is coupled to the low-noise amplifier, and the second mixer is coupled to the second transformer coil.

### Claim 7 (depends on 4)

The radio frequency transceiver device according to claim 4, wherein the first matching circuit further comprises:
a first inductor coupled to the antenna unit and the low-noise amplifier; and
a switching element having a first end and a second end, wherein the first end of the switching element is coupled between the first inductor and the low-noise amplifier, and the second end of the switching element is coupled to a ground;
wherein, the switching element is configured to be turned off when the first radio frequency signal is the high gain radio frequency signal, so that the first inductor and the low-noise amplifier form the first signal reception channel to receive and process the first radio frequency signal: the switching element is configured to be turned on and the low-noise amplifier is configured to be turned off when the first radio frequency signal is a middle-low gain radio frequency signal, so that the second matching circuit and the auxiliary circuit form the second signal reception channel to receive and process the first radio frequency signal.

### Claim 8 (depends on 4)

The radio frequency transceiver device according to claim 4, wherein the second matching circuit further comprises:
a capacitor coupled to the antenna unit and a ground; and
an inductor pair comprising a second inductor and a third inductor, wherein the second inductor is shunted with the capacitor and coupled to the antenna unit and the ground, and the third inductor is coupled to the transmitter circuit and the first transformer coil of the auxiliary circuit.

### Claim 9

A radio frequency transceiver device comprising:
an antenna unit configured to receive a first radio frequency signal or transmit a second radio frequency signal;
a first matching circuit coupled to the antenna unit;
a receiver circuit coupled to the first matching circuit and comprising a mixer unit;
a second matching circuit coupled to the antenna unit;
a transmitter circuit coupled to the second matching circuit, wherein the second matching circuit and the transmitter circuit form a signal transmission channel configured to transmit the second radio frequency signal;
a third matching circuit coupled to the antenna unit; and
an auxiliary circuit comprising a first transformer coil and a second transformer coil, wherein the first transformer coil is coupled to the third matching circuit, and the second transformer coil is coupled to the mixer unit;
wherein the first matching circuit and the receiver circuit are configured to form a first signal reception channel; when the first radio frequency signal is a high gain radio frequency signal, the first signal reception channel receives and processes the first radio frequency signal and then transmits the first radio frequency signal to the mixer unit; the third matching circuit and the auxiliary circuit are configured to form a second signal reception channel: when the first radio frequency signal is a middle-low gain radio frequency signal, the second signal reception channel receives the first radio frequency signal and then transmits the first radio frequency signal to the mixer unit.

### Claim 10 (depends on 9)

The radio frequency transceiver device according to claim 9, wherein the receiver circuit further comprises:
a low-noise amplifier coupled to the first matching circuit, wherein the low-noise amplifier is configured to receive and amplify the first radio frequency signal matched by the first matching circuit when the first radio frequency signal is the high gain radio frequency signal.

### Claim 11 (depends on 10)

The radio frequency transceiver device according to claim 10, wherein the mixer unit comprises a first mixer coupled to the low-noise amplifier, and the second transformer coil is coupled between the first mixer and the low-noise amplifier.

### Claim 12 (depends on 10)

The radio frequency transceiver device according to claim 10, wherein the mixer unit comprises a first mixer and a second mixer, the first mixer is coupled to the low-noise amplifier, and the second mixer is coupled to the second transformer coil.

### Claim 13 (depends on 10)

The radio frequency transceiver device according to claim 10, wherein the first matching circuit further comprises:
a first inductor coupled to the antenna unit and the low-noise amplifier; and
a switching element having a first end and a second end, wherein the first end of the switching element is coupled between the first inductor and the low-noise amplifier, and the second end of the switching element is coupled to a ground;
wherein, the switching element is configured to be turned off when the first radio frequency signal is the high gain radio frequency signal, so that the first inductor and the low-noise amplifier form the first signal reception channel to receive and process the first radio frequency signal: the switching element is configured to be turned on and the low-noise amplifier is configured to be turned off when the first radio frequency signal is a middle-low gain radio frequency signal, so that the third matching circuit and the auxiliary circuit form the second signal reception channel to receive and process the first radio frequency signal.

### Claim 14 (depends on 10)

The radio frequency transceiver device according to claim 10, wherein the second matching circuit further comprises:
a capacitor coupled to the antenna unit and a ground; and
an inductor pair comprising a second inductor and a third inductor, wherein the second inductor is shunted with the capacitor and coupled to the antenna unit and the ground, and the third inductor is coupled to the transmitter circuit and the first transformer coil of the auxiliary circuit.

### Claim 15 (depends on 10)

The radio frequency transceiver device according to claim 10, wherein the third matching circuit further comprises:
a capacitor coupled to the antenna unit and a ground; and
an inductor pair comprising a fourth inductor and a fifth inductor, wherein the fourth inductor is shunted with the capacitor and coupled to the antenna unit and the ground, and the fifth inductor is coupled to the transmitter circuit and the first transformer coil of the auxiliary circuit.