CN-121643662-B - Radio frequency front-end chip with power-off non-mismatch matching function

Abstract

The invention discloses a radio frequency front-end chip with a power-off non-mismatch function, which comprises a receiving circuit amplifier, a transmitting circuit amplifier, a receiving power-off non-mismatch circuit and a transmitting power-off non-mismatch circuit, wherein the receiving power-off non-mismatch circuit is connected with the input end of the receiving circuit amplifier, the receiving power-off non-mismatch circuit works when the receiving circuit amplifier does not work, the transmitting power-off non-mismatch circuit is connected with the input end of the transmitting circuit amplifier, and the transmitting power-off non-mismatch circuit works when the transmitting circuit amplifier does not work. The invention can make the impedance of the output end of the transmitting circuit amplifier match with the impedance of the 90-degree bridge at the front end when the transmitting circuit amplifier is closed, and can make the impedance of the input end of the receiving circuit amplifier match with the impedance of the 90-degree bridge at the front end when the receiving circuit amplifier is closed.

Inventors

• JIANG YIFAN
• SONG JIAYING
• WANG JIANQIN

Assignees

• 厦门科塔电子有限公司

Dates

Publication Date

20260512

Application Date

20260203

Claims (6)

1. 1. The radio frequency front end chip with the power-off non-mismatch matching function is characterized by comprising a receiving circuit amplifier, a transmitting circuit amplifier, a receiving power-off non-mismatch matching circuit and a transmitting power-off non-mismatch matching circuit; The receiving power-off uninterrupted matching circuit is connected with the input end of the receiving circuit amplifier, the receiving power-off uninterrupted matching circuit is used for adjusting the impedance of the input end of the receiving circuit amplifier, the receiving power-off uninterrupted matching circuit is controlled by the receiving circuit amplifier, the receiving power-off uninterrupted matching circuit comprises a resistor R11, a resistor R12, a capacitor C11, a capacitor C12 and a switch tube SW11, the first end of the capacitor C11 is connected with the input end of the receiving circuit amplifier, the second end of the capacitor C11 is connected with the drain electrode of the switch tube SW1, the first end of the resistor R11 is connected with the grid electrode of the switch tube SW1, the second end of the resistor R11 is grounded, the first end of the resistor R12 is connected with the source electrode of the switch tube SW1, and the second end of the resistor R12 is connected with the control end of the receiving circuit amplifier; The transmitting power-off uninterrupted matching circuit is connected with the output end of the transmitting circuit amplifier, the transmitting power-off uninterrupted matching circuit is used for adjusting the impedance of the output end of the transmitting circuit amplifier, the transmitting power-off uninterrupted matching circuit is controlled by the transmitting circuit amplifier, the transmitting power-off uninterrupted matching circuit comprises a resistor R21, a resistor R22, a resistor R23, a capacitor C21, a capacitor C22, a switching tube SW21 and a switching tube SW22, the first end of the capacitor C21 is connected with the output end of the transmitting circuit amplifier, the second end of the capacitor C21 is connected with the drain electrode of the switching tube SW21, the first end of the resistor R21 is connected with the gate electrode of the switching tube SW21, the second end of the resistor R21 is grounded, the first end of the resistor R22 is connected with the source electrode of the switching tube SW22, and the second end of the resistor R23 is connected with the control end of the transmitting circuit amplifier, and the source electrode of the switching tube SW21 is connected with the drain electrode of the switching tube SW 22; When the receiving circuit amplifier is operated, the transmitting circuit amplifier is not operated, the transmitting power-off non-mismatch circuit is operated, the receiving power-off non-mismatch circuit is not operated, and when the transmitting circuit amplifier is operated, the receiving circuit amplifier is not operated, the receiving power-off non-mismatch circuit is operated, and the transmitting power-off non-mismatch circuit is not operated.
2. 2. The RF front-end chip with power-down mismatch function of claim 1, wherein the receive amplifier, the transmit amplifier, the receive power-down mismatch circuit, and the transmit power-down mismatch circuit are integrated in the RF front-end chip with power-down mismatch function using GAAS PHEMT process, siGe BiCMOS process, or SOI CMOS process.
3. 3. The RF front-end chip with power-off mismatch function of claim 1, wherein the receive path amplifier is a low noise amplifier and the transmit path amplifier is a power amplifier.
4. 4. The radio frequency front end chip with the power-off non-mismatch matching function is characterized by comprising a receiving circuit amplifier, a transmitting circuit amplifier, a receiving power-off non-mismatch matching circuit and a transmitting power-off non-mismatch matching circuit; The receiving power-off non-mismatch matching circuit is connected with the input end of the receiving circuit amplifier, the receiving power-off non-mismatch matching circuit is used for adjusting the impedance of the input end of the receiving circuit amplifier, the receiving power-off non-mismatch matching circuit is controlled by the transmitting circuit amplifier, the receiving power-off non-mismatch matching circuit comprises a resistor R11', a resistor R12', a capacitor C11', a capacitor C12' and a switching tube SW11', the first end of the capacitor C11' is connected with the input end of the receiving circuit amplifier, the second end of the capacitor C11 'is connected with the drain electrode of the switching tube SW11', the first end of the capacitor C12 'is connected with the source electrode of the switching tube SW11', the second end of the resistor R11 'is connected with the control end of the transmitting circuit amplifier, the first end of the resistor R12' is connected with the source electrode of the switching tube SW11', and the second end of the resistor R12' is connected with the power supply VCC when the transmitting circuit amplifier works; The transmitting power-off non-mismatch matching circuit is connected with the output end of the transmitting circuit amplifier, the transmitting power-off non-mismatch matching circuit is used for adjusting the impedance of the output end of the transmitting circuit amplifier, the transmitting power-off non-mismatch matching circuit is controlled by the receiving circuit amplifier, the transmitting power-off non-mismatch matching circuit comprises a resistor R21', a resistor R22', a resistor R23', a capacitor C21', a capacitor C22', a switching tube SW21' and a switching tube SW22', the first end of the capacitor C21' is connected with the output end of the transmitting circuit amplifier, the second end of the capacitor C21' is connected with the drain electrode of the switching tube SW21', the first end of the capacitor C22' is connected with the source electrode of the switching tube SW11', the second end of the resistor R21' is directly grounded, the second end of the resistor R21' is connected with the first end of the resistor R22' and then connected with the control end of the receiving circuit amplifier, the second end of the resistor R22' is connected with the gate electrode of the switching tube SW22', the first end of the resistor R23' is connected with the source electrode of the switching tube SW22', and the second end of the resistor R23' is connected with the source electrode of the switching tube SW21' when the receiving circuit amplifier is in a low-level state; When the receiving circuit amplifier is operated, the transmitting circuit amplifier is not operated, the transmitting power-off non-mismatch circuit is operated, the receiving power-off non-mismatch circuit is not operated, and when the transmitting circuit amplifier is operated, the receiving circuit amplifier is not operated, the receiving power-off non-mismatch circuit is operated, and the transmitting power-off non-mismatch circuit is not operated.
5. 5. The RF front-end chip with power-down mismatch function of claim 4, wherein the receive amplifier, the transmit amplifier, the receive power-down mismatch circuit, and the transmit power-down mismatch circuit are integrated in the RF front-end chip with power-down mismatch function using GAAS PHEMT process, siGe BiCMOS process, or SOI CMOS process.
6. 6. The RF front-end chip with power-off mismatch function of claim 4, wherein the receive path amplifier is a low noise amplifier and the transmit path amplifier is a power amplifier.

Description

Radio frequency front-end chip with power-off non-mismatch matching function Technical Field The invention relates to the field of radio frequency communication, in particular to a radio frequency front-end chip with a power-off matching function. Background Satellite internet technology is a technology that has been rapidly developed in recent years, and in order to achieve low noise figure of reception, high power of transmission and high efficiency, a radio frequency front-end chip becomes an indispensable part of the whole radio frequency link. In order to overcome the problem of polarization mismatch generated by the low-orbit satellite and the ground terminal in high-speed relative motion, and ensure the stability and reliability of a communication link under a complex propagation condition, a circularly polarized antenna must be adopted. In the traditional architecture, the rear end of the circularly polarized antenna is connected with a 90-degree bridge, and the rear side of the 90-degree bridge is connected with a transmitting-path amplifier (generally a power amplifier) and a receiving-path amplifier (generally a low-noise amplifier) of a radio-frequency front-end chip through a single-pole double-throw switch. Such an architecture may cause deterioration of the reception noise figure and the transmission power, and in particular, the former is more seriously affected. Therefore, if the single pole double throw switch can be removed, the noise coefficient of the whole system is greatly improved, but the main problem of the conventional amplifier is that when the amplifier is turned off, the mismatch of the input port or the output port is serious, and the 90-degree bridge required by the circularly polarized antenna also requires that the impedance of the isolation port is close to 50 ohms so as to absorb any reflected power or energy leaked between the ports and maintain the amplitude and phase balance of the output signal. This means that the receiving-side amplifier is turned off when the transmitting-side amplifier is in operation (i.e. when the transmitting-side amplifier is in operation) and the impedance of the input of the receiving-side amplifier must also be close to 50 ohms, and that the transmitting-side amplifier is turned off when the receiving-side amplifier is in operation (i.e. when the receiving-side amplifier is in operation) and the impedance of the output of the transmitting-side amplifier must also be close to 50 ohms, contrary to the normal amplifier operation. In view of the above, it is necessary to develop a radio frequency front end chip with a power-off matching function, which can match the impedance of the output end of the transmitting amplifier with the impedance of the 90 degree bridge of the front end when the transmitting amplifier is turned off, and can match the impedance of the input end of the receiving amplifier with the impedance of the 90 degree bridge of the front end when the receiving amplifier is turned off. Disclosure of Invention The invention aims to provide a radio frequency front-end chip with a power-off non-mismatch matching function, which can enable the impedance of an output end of a transmitting-circuit amplifier to be matched with the impedance of a 90-degree bridge at the front end when the transmitting-circuit amplifier is closed, and can enable the impedance of an input end of a receiving-circuit amplifier to be matched with the impedance of the 90-degree bridge at the front end when the receiving-circuit amplifier is closed. In order to achieve the above object, the solution of the present invention is: The radio frequency front end chip with the power-off non-mismatch matching function comprises a receiving circuit amplifier, a transmitting circuit amplifier, a receiving power-off non-mismatch matching circuit and a transmitting power-off non-mismatch matching circuit, wherein the receiving power-off non-mismatch matching circuit is connected with the input end of the receiving circuit amplifier and used for adjusting the impedance of the input end of the receiving circuit amplifier, the receiving power-off non-mismatch matching circuit is connected with the control end of the receiving circuit amplifier or the control end of the transmitting circuit amplifier, the receiving power-off non-mismatch matching circuit is controlled by the receiving circuit amplifier or the transmitting circuit amplifier, the transmitting power-off non-mismatch matching circuit is connected with the output end of the transmitting circuit amplifier and used for adjusting the impedance of the output end of the transmitting circuit amplifier, the transmitting power-off non-mismatch matching circuit is connected with the control end of the receiving circuit amplifier or the control end of the transmitting circuit amplifier, the transmitting power-off non-mismatch matching circuit is controlled by the receiving circuit amplifier or the transmitting circuit ampli