Six-bit digital phase shifter

Abstract

The invention discloses a six-bit digital phase shifter comprising a 5.625-degree phase shift circuit, a 11.25-degree phase shift circuit, a 22.5-degree phase shift circuit, a 45-degree phase shift circuit, a 90-degree phase shift circuit and a 180-degree phase shift circuit, wherein the 5.625-degree phase shift circuit, the 11.25-degree phase shift circuit, the 22.5-degree phase shift circuit andthe 45-degree phase shift circuit are cascaded between the 90-degree phase shift circuit and 180-degree phase shift circuit in any sequence. The higher phase shift circuits of the phase shifter are used as the output and the output of the phase shifter, thereby being able to not only improve the matching ability of the polarities of the phase shifter, but not effectively improve the phase shift precision.

Description

technical field

[0001] The invention relates to the field of phase shifters, in particular to a six-bit digital phase shifter. Background technique

[0002] The phase shifter is an important part of the T / R component of the phased array radar. It is used to change the transmission phase of the signal. It plays a non-negligible role in the communication equipment and radar system, and determines the performance of the entire system.

[0003] Phase shifters are generally divided into two types: analog and digital. Digital phase shifters are widely used in phased array radars because they are not affected by voltage and temperature changes. It has a variety of implementation methods, and the more commonly used ones are switch line type, load line type, reflection type and high-low pass filter type. The choice of phase shifter topology needs to be determined according to the specific design indicators. High precision, high performance, and low cost are what phase shifter design...

Examples

Embodiment 1

[0023] Such as figure 1 A six-bit digital phase shifter shown includes a 5.625° phase shift circuit, a 11.25° phase shift circuit, a 22.5° phase shift circuit, a 45° phase shift circuit, a 90° phase shift circuit and a 180° phase shift circuit. It is characterized in that the 5.625° phase shift circuit, the 11.25° phase shift circuit, the 22.5° phase shift circuit, and the 45° phase shift circuit are cascaded between the 90° phase shift circuit and the 180° phase shift circuit in any order.

Embodiment 2

[0025] Both 90° phase shift circuit and 180° phase shift circuit can be used as the input terminal of this digital phase shifter, and 5.625° phase shift circuit, 11.25° phase shift circuit, 22.5° phase shift circuit and 45° phase shift circuit can be used in any order Cascading, for example, it can be arranged in order from small to large, or from large to small, or in random order. However, in order to enhance the EDB output power of the phase shifter, the 180° phase shift circuit is used as this The input end of the digital phase shifter, and the 22.5° phase shift circuit, the 45° phase shift circuit, the 11.25° phase shift circuit, and the 5.625° phase shift circuit are cascaded in sequence.

[0026] The circuit with this structure can effectively improve the inter-electrode matching of the phase shifter, and can effectively improve the phase shifting precision.

Embodiment 3

[0028] Based on the principle of the above structure, this embodiment discloses a detailed implementation manner.

[0029] Such as figure 2 As shown, the 5.625° phase shift circuit includes a first field effect transistor M1, and a first inductor L1 is connected between the source and drain of the first field effect transistor M1. The 5.625° phase shift circuit uses a single switch tube To control, by changing the phase shift of the control relationship, when the first field effect transistor is turned on and the first inductance is large enough, the whole circuit can be regarded as a series resistor, so the phase shift of the circuit is very small, which can be used as a reference position, and the circuit Insertion loss is determined by the size of M1. When the first field effect tube is turned off, the circuit is equivalent to a parallel connection of a capacitor and an inductor, which can generate a small phase shift under the condition of ensuring standing wave performa...

technical field

[0001] The invention relates to the field of phase shifters, in particular to a six-bit digital phase shifter. Background technique

[0002] The phase shifter is an important part of the T / R component of the phased array radar. It is used to change the transmission phase of the signal. It plays a non-negligible role in the communication equipment and radar system, and determines the performance of the entire system.

[0003] Phase shifters are generally divided into two types: analog and digital. Digital phase shifters are widely used in phased array radars because they are not affected by voltage and temperature changes. It has a variety of implementation methods, and the more commonly used ones are switch line type, load line type, reflection type and high-low pass filter type. The choice of phase shifter topology needs to be determined according to the specific design indicators. High precision, high performance, and low cost are what phase shifter design...

Examples

Embodiment 1

[0023] Such as figure 1 A six-bit digital phase shifter shown includes a 5.625° phase shift circuit, a 11.25° phase shift circuit, a 22.5° phase shift circuit, a 45° phase shift circuit, a 90° phase shift circuit and a 180° phase shift circuit. It is characterized in that the 5.625° phase shift circuit, the 11.25° phase shift circuit, the 22.5° phase shift circuit, and the 45° phase shift circuit are cascaded between the 90° phase shift circuit and the 180° phase shift circuit in any order.

Embodiment 2

[0025] Both 90° phase shift circuit and 180° phase shift circuit can be used as the input terminal of this digital phase shifter, and 5.625° phase shift circuit, 11.25° phase shift circuit, 22.5° phase shift circuit and 45° phase shift circuit can be used in any order Cascading, for example, it can be arranged in order from small to large, or from large to small, or in random order. However, in order to enhance the EDB output power of the phase shifter, the 180° phase shift circuit is used as this The input end of the digital phase shifter, and the 22.5° phase shift circuit, the 45° phase shift circuit, the 11.25° phase shift circuit, and the 5.625° phase shift circuit are cascaded in sequence.

[0026] The circuit with this structure can effectively improve the inter-electrode matching of the phase shifter, and can effectively improve the phase shifting precision.

Embodiment 3

[0028] Based on the principle of the above structure, this embodiment discloses a detailed implementation manner.

[0029] Such as figure 2 As shown, the 5.625° phase shift circuit includes a first field effect transistor M1, and a first inductor L1 is connected between the source and drain of the first field effect transistor M1. The 5.625° phase shift circuit uses a single switch tube To control, by changing the phase shift of the control relationship, when the first field effect transistor is turned on and the first inductance is large enough, the whole circuit can be regarded as a series resistor, so the phase shift of the circuit is very small, which can be used as a reference position, and the circuit Insertion loss is determined by the size of M1. When the first field effect tube is turned off, the circuit is equivalent to a parallel connection of a capacitor and an inductor, which can generate a small phase shift under the condition of ensuring standing wave performa...

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