RF Switch Control Circuit With Dual Negative Voltage Modes
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Solution Overview
Problem
Existing radio frequency (RF) switch circuits face challenges in maintaining good harmonic characteristics in low power mode due to undefined voltage states of switches, leading to deteriorated performance.
Innovation Solution
A switch control circuit that includes charge pump circuits generating multiple negative voltages and switch drivers to manage switch states in both active and low power modes, ensuring defined voltage control for improved harmonic characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the series switch and shunt switch are turned off at 0V in low power mode, then power consumption is reduced, but the harmonic characteristics at the antenna terminal deteriorate
Solution Approach 1:
The patent applies parameter changes by switching between two different negative voltage levels (-1.8V and -3.6V) based on the operational mode. In low power mode, a less negative voltage (-1.8V) is applied to turn off the series switch while maintaining acceptable harmonic characteristics, whereas in active mode, a more negative voltage (-3.6V) ensures complete switch-off for optimal performance. This dynamic parameter adjustment resolves the contradiction between power consumption and harmonic characteristics.
2Use of energy by moving object
If elements supplying power supply voltage and negative voltage are turned off in low power mode, then power consumption is reduced, but the series switch and shunt switch cannot operate with defined voltage levels
Solution Approach 1:
The patent segments the voltage supply system into two independent charge pump circuits: a first charge pump that generates -1.8V and a second charge pump that generates -3.6V. This segmentation allows selective activation of voltage generation based on operational mode, enabling the system to maintain defined voltage control for switch operation while minimizing power consumption by activating only the necessary voltage level in low power mode.
Solution Approach 2:
The patent implements dynamic voltage control by using a control circuit that selectively enables or disables specific charge pump circuits based on the operational mode. In low power mode, the system dynamically switches to using only the first charge pump for series switch control, while the second charge pump remains inactive. This dynamic adaptation allows the system to maintain proper voltage control for switch operation while optimizing power consumption.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution maintains optimal harmonic characteristics in low power mode by providing controlled negative voltages to RF switches, reducing power consumption while maintaining signal integrity.
Implementation Method 1
a charge pump circuit configured to generate, in a first mode, a first negative voltage based on a first voltage
Data Source
AI summary
A switch control circuit that controls a first switch connected between a first port and a second port, and switches a radio frequency (RF) signal, is provided. The switch control circuit includes a first charge pump circuit configured to generate, in a first mode, a first negative voltage based on a first voltage; a second charge pump circuit configured to generate, in a second mode, a second negative voltage higher than the first negative voltage based on a second voltage; and a first switch driver configured to turn off, in the second mode, the first switch by providing the second negative voltage to a control terminal of the first switch.