Multiple-Ramp Attenuator Switching for Low Distortion
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Solution Overview
Problem
Existing variable attenuators suffer from undesirable distortion and insertion loss due to switch devices used to achieve various levels of attenuation, which are not adequately addressed by current technologies.
Innovation Solution
The design incorporates multiple switches with staggered voltage control transitions and resistors connected in series with the gate and back gate of switches to mitigate distortion while maintaining low fully on resistance and minimal insertion loss, using a configuration of field effect transistors and voltage-controlled switch devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If switch devices are used to achieve various levels of attenuation, then variable attenuation is enabled, but distortion and insertion loss increase
Solution Approach 1:
The attenuator is divided into multiple attenuation segments (first attenuation segment and second attenuation segment) with different attenuation values. Switches selectively connect these segments to achieve variable attenuation levels. This segmentation allows the system to provide multiple discrete attenuation levels while maintaining better signal integrity compared to using a single switch with continuous variable attenuation.
2Object-generated harmful factors
If multiple switches are used with staggered voltage control, then distortion is reduced, but device complexity increases
Solution Approach 1:
The controller implements staggered voltage control where the first voltage control signal transitions the first switch before the second voltage control signal transitions the second switch. This preliminary action sequence ensures that switches are activated in a controlled manner, preventing simultaneous switching transients that would cause distortion. The staggered timing is pre-planned and executed to optimize signal integrity.
Solution Approach 2:
The controller uses periodic voltage control signals with specific timing relationships to manage the switching of multiple switches. By applying voltage control signals in a periodic sequence with staggered timing, the system achieves smooth transitions between attenuation levels while minimizing distortion caused by simultaneous switching events.
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
This approach significantly reduces distortion and maintains minimal insertion loss, achieving effective attenuation with improved performance compared to traditional switch-based attenuators.
Implementation Method 1
The first switch, the second switch, and/or the third switch can be a field effect transistor
Data Source
AI summary
The present disclosure provides an attenuator and associated methods of operations. An exemplary attenuator includes an input terminal, an output terminal, a voltage reference terminal, a first attenuation segment coupled with the input terminal and the output terminal, and a second attenuation segment coupled with the first attenuation segment and the voltage reference terminal. The attenuator further includes at least two switches coupled with the input terminal and the output terminal in parallel with the first attenuation segment, where at least some of the at least two switches have an associated voltage control terminal. For example, the attenuator includes a first switch and a second switch coupled with the input terminal and the output terminal in parallel with the first attenuation segment, wherein a first voltage control terminal is coupled with the first switch and a second voltage control terminal is coupled with the second switch.