Current-Mode RF Pulse Generator Circuit With Programmable Gain
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Solution Overview
Problem
Quantum computing systems face challenges with high power consumption and distortion in signal generation, particularly in cryogenic environments, due to the use of voltage mode representations which lead to nonlinear behavior and increased noise, limiting the coherence time of qubits and scalability of quantum systems.
Innovation Solution
Implementing a current-mode end-to-end signal path in RF pulse generators, utilizing a baseband filter and output stage with a current source and diode-connected transistor in parallel, allowing for adjustable gain and reduced static bias to signal current ratio, thereby reducing power consumption and distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If voltage mode representations are used in RF pulse generators, then signal generation capability is maintained, but power consumption increases and distortion occurs
Solution Approach 1:
The patent replaces voltage mode signal processing with current mode signal processing throughout the RF pulse generator signal chain. This substitution fundamentally changes the domain of operation from voltage to current, eliminating the need for high impedance nodes and voltage swings that cause power consumption and distortion in voltage mode systems.
Solution Approach 2:
The patent changes the operating parameter domain from voltage to current. By operating the entire signal chain (DAC, baseband filter, mixer, attenuator, amplifier) in current mode, the system achieves lower power consumption and reduced distortion while maintaining signal generation capability.
2Loss of energy
If current-mode signal path is implemented, then power efficiency improves, but device complexity increases
Solution Approach 1:
The patent merges the entire signal chain components (DAC, baseband filter, mixer, attenuator, amplifier) into a unified current mode architecture. By designing all components to operate natively in current mode rather than converting between voltage and current, the patent eliminates intermediate conversion stages and reduces overall system complexity despite the specialized current mode implementation.
3Loss of energy
If static bias current ratio is reduced at output stage, then power consumption decreases, but signal linearity may be affected
Solution Approach 1:
The patent segments the bias current management by implementing independent bias control at different stages of the signal chain. The output stage can operate with lower static bias current ratio optimized for power efficiency, while earlier stages maintain appropriate bias levels for linearity, allowing each segment to be optimized independently.
Solution Approach 2:
The patent applies different bias current ratios at different locations in the signal chain. The output stage uses a reduced static bias to signal current ratio optimized for power efficiency, while other stages maintain bias ratios optimized for their specific functions, creating local optimization throughout the system.
Data Source
AI summary
One or more systems, devices and/or methods of use provided herein relate to a device that can facilitate a signal generation. A current-mode end-to-end signal path can include a digital to analog converter (DAC) operating in current-mode and an upconverting mixer, operating in current-mode and operatively coupled to the DAC. Analog inputs and analog outputs of the DAC and the upconverting mixer can be represented as currents, and the DAC can generate a baseband signal. In one or more embodiments, a current source and a diode-connected transistor can be arranged in parallel in the current-mode signal path between a baseband filter and an output stage comprising the upconverting mixer. The device and/or system can be a radio frequency DAC. The diode-connected transistor can be programmable to vary gain and/or can be directly connected to the output stage absent a turnaround current mirror connected therebetween.