Amplitude Sweep Generator Using Time-Modulated Shift Register Control
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Solution Overview
Problem
Signal generators used in biomedical applications, such as biomedical radar systems, face challenges in achieving high accuracy and linearity in amplitude sweeps while maintaining low circuit complexity and efficiency.
Innovation Solution
A signal generator design utilizing a shift register controlled by a clock signal with time modulation, where activation or deactivation bits are shifted to control the activation of parallel control components, such as power amplifier units or resistors, to achieve a desired amplitude sweep with intrinsic dependence on the number of activated components, compensating for non-linearity through time-modulated clock signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If switchable parallel power amplifier units or switchable resistors are used to generate amplitude sweeps, then the amplitude sweep can be generated, but the circuit complexity increases and power consumption rises
Solution Approach 1:
The signal generator is divided into multiple parallel control components (power amplifier units or resistors) that can be independently switched. Each control component corresponds to a bit in the shift register, allowing granular control of the amplitude sweep through individual switching elements rather than a single complex component.
Solution Approach 2:
The clock signal is time-modulated to dynamically adjust the switching timing of control components. This dynamic timing control compensates for the non-linear intrinsic dependence of amplitude on the number of activated components, enabling accurate amplitude sweeps without requiring complex static circuit design.
2Manufacturing precision
If switchable parallel power amplifier units or switchable resistors are used to generate amplitude sweeps, then the amplitude sweep can be generated, but power consumption increases
Solution Approach 1:
Instead of activating all control components simultaneously or continuously, the system activates only the necessary number of components at each time step to achieve the desired amplitude. The shift register enables progressive activation (or deactivation) of components, ensuring minimal power consumption while maintaining sweep accuracy.
Solution Approach 2:
The amplitude sweep is generated through periodic clock signals that rhythmically switch control components on and off. This periodic switching, controlled by the time-modulated clock, creates the amplitude sweep pattern while allowing components to remain in low-power states when not actively switching.
3Device complexity
If a standard clock signal is used to pace the shift register, then the circuit operation is simple, but the amplitude sweep linearity is poor due to intrinsic non-linear dependence
Solution Approach 1:
The clock signal parameters (timing, frequency) are changed dynamically to compensate for the non-linear amplitude response. By adjusting the clock signal timing based on the intrinsic non-linear dependence of amplitude on the number of activated components, the system achieves linear amplitude sweeps without complicating the basic circuit architecture.
Data Source
AI summary
A signal generator is configured to generate a signal with an amplitude sweep, the signal generator having circuitry comprising: a set of control components, each control component of the set being arranged to be switchably activated in parallel in the circuitry such that an amplitude of the signal has an intrinsic dependence on the number of the control components activated; a shift register controllable by a clock line and comprising a number of bits, each bit of the number of bits controlling activation of a respective control component of the set of control components such that the control components are arranged to be activated or de-activated in a pre-determined order by shifting activation or de-activation bits into the shift register, wherein the shifting is paced by the clock line; and a clock signal generator configured to output a clock signal with a time modulation on the clock line.