CN-122026846-A - Switch self-phase-shifting passive phase shifter

CN122026846ACN 122026846 ACN122026846 ACN 122026846ACN-122026846-A

Abstract

The invention discloses a switch self-phase-shifting passive phase shifter which comprises a switch self-phase shifting unit, a transmission line segment network and a phase error compensation network, wherein the switch self-phase shifting unit comprises a single-pole double-throw switch, the single-pole double-throw switch comprises a public end, a first throw end and a second throw end, the transmission line segment network is electrically connected with the single-pole double-throw switch and is used for providing different path lengths or equivalent phase responses for signals when the single-pole double-throw switch is in different switch states so as to generate a preset phase difference, the phase error compensation network comprises an inductance element connected between a preset node of the single-pole double-throw switch and a reference potential in parallel, and the inductance element and the inherent parasitic capacitance of the single-pole double-throw switch jointly form an LC network which presents a negative group delay characteristic in a target working frequency band and is used for compensating frequency related errors of the preset phase difference.

Inventors

CHEN JIXIN
WANG YANG
ZHOU PEIGEN
Li Jinben
KONG LINGZHENG
ZHENG ZICHUN

Assignees

东南大学

Dates

Publication Date: 20260512
Application Date: 20260413

Claims (9)

1. A switch self-phase-shifting passive phase shifter is characterized by comprising at least one switch self-phase shifting unit, a transmission line segment network and a phase error compensation network, wherein the switch self-phase shifting unit comprises a single-pole double-throw switch, the single-pole double-throw switch comprises a public end, a first throwing end and a second throwing end, the transmission line segment network is electrically connected with the single-pole double-throw switch and is used for providing different path lengths or equivalent phase responses for signals when the single-pole double-throw switch is in different switch states so as to generate a preset phase difference at an output end of the switch self-phase shifting unit, the phase error compensation network comprises an inductance element connected between a preset node of the single-pole double-throw switch and a reference potential in parallel, and the inductance element and the inherent parasitic capacitance of the single-pole double-throw switch jointly form an LC network which presents a negative group delay characteristic in a target working frequency band and is used for compensating frequency-dependent errors of the preset phase difference.
2. The switched self-phase-shifting passive phase shifter of claim 1, wherein the transmission line network comprises a quarter-wavelength equivalent transmission line integrated into the structure of a single pole double throw switch or multiplexed as part of the signal path in which the first or second throw is located.
3. The switched self-phase shifting passive phase shifter of claim 1, wherein the LC network utilizes an inherent parasitic capacitance of the single pole double throw switch itself as a capacitive component thereof, the inherent parasitic capacitance comprising one or more of an equivalent output capacitance, drain-source capacitance, or junction capacitance of a transistor in an off state in the single pole double throw switch.
4. The switched-mode phase-shifting passive phase shifter of claim 1, wherein the phase error compensation network further comprises a resistive element connected in series or parallel with the inductive element for adjusting the quality factor of the LC network to suppress amplitude fluctuations of the switched-mode phase shifting unit under different operating conditions.
5. The switched-mode passive phase shifter of claim 1, wherein the inductive element is an adjustable inductance for programmable adjustment of the amount of phase error compensation.
6. The switched-mode phase-shifting passive phase shifter of claim 1, wherein the switched-mode phase-shifting unit further comprises an impedance matching module sharing a transmission line or a lumped element with the transmission line network to enable the switched-mode phase-shifting unit to perform the phase-shifting function while simultaneously achieving port impedance matching.
7. The passive phase shifter of claim 1, comprising a plurality of cascaded switching self-shifting units, each of the switching self-shifting units implementing a predetermined phase step value, and the phase step values implemented by the different switching self-shifting units being in a binary weighted relationship or a piecewise weighted relationship, thereby forming a multi-bit phase shifter.
8. The switch self-phase shifting unit is applied to the phase shifter of any one of claims 1 to 7, and is characterized by comprising a single-pole double-throw switch, a transmission line segment and a parallel inductor, wherein the transmission line segment is electrically connected with the single-pole double-throw switch and is used for generating a basic phase difference under different switch states of the single-pole double-throw switch, the parallel inductor is electrically connected between an internal node of the single-pole double-throw switch and a reference ground, and the parallel inductor and a parasitic capacitor of the single-pole double-throw switch resonate to form a network with a negative group delay characteristic and is used for correcting deviation of the basic phase difference along with frequency change.
9. A phased array transceiver front-end implemented with a phase shifter as claimed in any one of claims 1 to 7, comprising a plurality of transceiver channels, each transceiver channel switching a self-shifting passive phase shifter for independently adjusting the phase of a corresponding channel signal.

Description

Switch self-phase-shifting passive phase shifter Technical Field The invention relates to the technical field of sub-terahertz (sub-THz) radio frequency integrated circuits and phased array front ends, in particular to a switch self-phase-shifting passive phase shifter. Background Future 6G wireless systems are expected to realize multi-gigabit short-range communication links using atmospheric windows near the D-band, while compromising high-resolution sensing and imaging applications. Silicon-based integrated platforms (e.g., siGe BiCMOS) have higher integration and cost advantages and can be used to implement large-scale D-band phased arrays. In phased arrays, phase shifters are used to assign precise phase control to each antenna channel, whose performance will directly affect the array gain, equivalent omni-directional radiated power (EIRP), and receiver signal-to-noise ratio (SNR). Therefore, the phase shifter facing the D band is generally required to meet the requirements of low insertion loss, higher phase resolution, low power consumption, higher linearity and the like at the same time so as to support the implementation of the energy-efficient optimized transceiver front end. Existing passive switching phase shifters and phase shifters based on True Time Delay (TTD) often face problems of large insertion loss, accumulation of phase errors, or large implementation area in the D band. The pi-type or T-type topology employing lumped capacitance networks typically controls the lumped capacitance array through a single series switch, which is susceptible to parasitic parameters and bandwidth limitations in the D-band, resulting in increased insertion loss and reduced phase accuracy compared to structures employing quarter-wavelength parallel switches [1]. On the other hand, a delay line network like "flex/slide" can achieve lower losses, higher phase accuracy and usually no calibration, but it relies on low-loss rf switches, in addition to which for n-bit shifters the number of switches grows exponentially with the number of phase states (2 n), and when the phase steps are further refined, the switching cascade will cause the insertion loss to rise rapidly. Reflective phase shifters rely on high performance tunable capacitors or low loss rf switches, and it is difficult to achieve high Q and low on-resistance in the D band, often relying on more advanced or costly process platforms. Although the vector synthesis phase shifter can realize higher phase resolution and broadband characteristics, an active gain and vector modulation module is generally introduced, and the trade-off problem between power consumption and linearity is faced. Disclosure of Invention The invention aims to provide a switch self-phase-shifting passive phase shifter, which solves the problems in the background technology through a passive switch phase shifter with compact low-loss high-precision design. The technical scheme is that the switch self-phase-shifting passive phase shifter comprises at least one switch self-phase shifting unit, a transmission line segment network and a phase error compensation network, wherein the switch self-phase shifting unit comprises a single-pole double-throw switch, the single-pole double-throw switch comprises a public end, a first throw end and a second throw end, the transmission line segment network is electrically connected with the single-pole double-throw switch and is used for providing different path lengths or equivalent phase responses for signals when the single-pole double-throw switch is in different switch states so as to generate a preset phase difference at an output end of the switch self-phase shifting unit, the phase error compensation network comprises an inductance element connected between a preset node of the single-pole double-throw switch and a reference potential in parallel, and the inductance element and the inherent parasitic capacitance of the single-pole double-throw switch jointly form an LC network which presents negative group delay characteristics in a target working frequency band and is used for compensating frequency-dependent errors of the preset phase difference. Further, the transmission line segment network comprises a quarter-wavelength equivalent transmission line segment, wherein the quarter-wavelength equivalent transmission line segment is integrated in the structure of the single pole double throw switch or multiplexed as a part of the signal path where the first throw end or the second throw end is located. Further, the LC network utilizes the inherent parasitic capacitance of the single pole double throw switch itself as its capacitive component, including one or more of the equivalent output capacitance, drain-source capacitance, or junction capacitance of the transistors in the off state in the single pole double throw switch. Further, the phase error compensation network further comprises a resistor element connected in series or parallel with