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High linearity RF circuit and method for improving linearity thereof

a high-linearity, rf circuit technology, applied in electrical equipment, phase shifting networks, logic circuit coupling/interface arrangements, etc., can solve problems such as limiting the linearity of varactors, and achieve the effect of improving linearity performance and confirming the effectiveness of reverse cascaded configurations

Active Publication Date: 2021-10-14
CHENGDU SICORE SEMICON CORP LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent describes a diode module that is made up of multiple diodes coupled together in series. The module includes cascaded diodes, meaning they are connected in a way that allows for their performance to be enhanced. The module also includes connecting bias branches, which help to improve RF isolation and linearity of the RF circuit. This module design can be used in various RF circuits such as phase shifters, filters, and amplifiers. The results of simulation show that the RF phase shifters using the cascaded diode module have significantly improved linearity performance. Overall, the patent provides a solution for improving the performance of RF circuits.

Problems solved by technology

When handling higher input power, larger voltage swing may change the diode DC biasing point which limits the linearity of the varactors.

Method used

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  • High linearity RF circuit and method for improving linearity thereof
  • High linearity RF circuit and method for improving linearity thereof
  • High linearity RF circuit and method for improving linearity thereof

Examples

Experimental program
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Effect test

embodiment 1

[0026]FIG. 2 depicts a schematic diagram of a diode module 250 comprising cascaded diodes and connecting bias branches according to embodiment 1 of the invention. The diode module 250 comprises a first diode 252, a second diode 254, and a third diode 256, which are reversely coupled in series. Specifically, the first diode 252 has its cathode connected to a RF path (RF) between an RF input port (RFin) and an RF output port (RFout); the second diode 254 has its anode connected to the anode of the first diode 252 at a first node 272; the third diode 256 has its cathode connected to the cathode of the second diode 254 at a second node 274 and its anode grounded. Additionally, the diode module 250 further comprises a first connecting bias branch 262 coupled between the RF path and the second node 274, and a second connecting bias branch 264 coupled between the first node 272 and ground. In this embodiment, the first connecting bias branch 262 and the second connecting bias branch 264 ar...

embodiment 2

[0029]FIG. 3 depicts a schematic diagram of a diode module 300 comprising cascaded diodes, connecting resistors, and a series capacitor according to embodiment 2 of the invention. The diode module 300 comprises a first diode 312 and a second diode 314, which are reversely coupled in series. Specifically, the first diode 312 has its cathode connected to a RF path (RF) and its anode connected to an anode of the second diode 314 at a first node 332. A series capacitor 316 couples between the cathode of the second diode 314 at a second node 334 and ground. Additionally, the diode module 300 further comprise a first connecting resistor 322 coupled between the RF path and the second node 334, and a second connecting resistor 324 coupled between the first node 332 and ground. Compared to the diode module 250 in the embodiment 1, the diode module 300 incorporates the series capacitor 316 for further DC blocking between the RF path and ground.

embodiment 3

[0030]FIG. 4 depicts a schematic diagram of a diode module 400 comprising cascaded diodes, connecting resistors, a series capacitor, and a bias voltage source according to embodiment 3 of the invention. The diode module 400 comprises two diodes 412 and 414, which are reversely coupled in series. Specifically, a first diode 412 has its anode connected to a RF path (RF) via a series capacitor 416 at a first node 432 and its cathode connected to a cathode of a second diode 414 at a second node 434. The second diode 414 has its anode grounded. Additionally, the diode module 400 further comprises a first connecting resistor 422 coupled between the first node 432 and ground, and a second connecting resistor 424 coupled between a DC voltage source VDC and the second node 434, and, similar to the series capacitor 316 in the diode module 300 of the embodiment 2, the series capacitor 416 in the diode module 400 also provides further DC blocking between the RF path and ground. In one or more e...

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Abstract

Various embodiments of the invention relate to high linearity RF circuits that may operate or function consistently under various levels of voltage, current or power. Embodiments of a diode module comprising cascaded diodes and connecting bias branches are disclosed for improved linearity of RF circuits. The diode module may comprise multiple diodes reversely coupled in series. Additionally, the diode module further comprises connecting bias branches coupled in parallel with diode pairs. Such configuration of reversely cascaded diodes coupled with alternatively connecting bias branches increases the robustness of the diode module to handle high input voltage or power from the RF path, thus provides enhanced linearity for the RF circuit as compared to single diode configuration.

Description

BACKGROUNDA. Technical Field[0001]The present invention relates generally to RF circuits, and more particularly to RF circuits with high linearity.B. Background of the Invention[0002]A radio frequency (RF) circuit is an interconnection of electrical components (e.g., resistors, inductors, capacitors, switches, transistors, voltage sources, current sources, etc.) used to transmit, receive or process radio signals. A phase shifter is a microwave network module which provides a controllable phase shift of the radio frequency (RF) signal. RF circuits have been used widely in various applications, such as satellite communications, automotive radar, 5G cellular communications, imaging and sensing, etc. It is desirable that a RF circuit has a high linearity such that the RF circuit may operate or function consistently under various levels of voltage, current or power in the RF circuit.[0003]Many RF circuits, e.g. RF phase shifters, filters, voltage controlled oscillators, mixers, or freque...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H03H11/18
CPCH03H11/18H03K19/0175H04B1/582H03H7/20H03H2210/033H03H2210/025
Inventor ZHANG, CEMIN
Owner CHENGDU SICORE SEMICON CORP LTD