Localized Frequency-Multiplying DAC Cells for Lower-Power RF Output
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Solution Overview
Problem
Existing digital-to-analog converters (DACs) require multiple stages and high clock signal frequencies, leading to increased power consumption and complexity, which can be mitigated by incorporating localized frequency multiplication circuits.
Innovation Solution
Incorporating frequency multiplication circuitry within each cell of the DAC to generate analog signals at higher frequencies, reducing the need for additional amplification and filtration stages, thereby lowering operating frequencies and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple stages and high clock signal frequencies are used in existing DACs, then signal generation capability is improved, but power consumption and complexity increase
Solution Approach 1:
The patent combines the frequency multiplication function with the DAC cell structure by integrating local oscillators and frequency multiplication circuitry directly within each DAC cell. This merging eliminates the need for separate frequency multiplication stages, reducing overall device complexity while maintaining signal generation capability at higher frequencies
Solution Approach 2:
The patent divides the frequency multiplication function into individual DAC cells, where each cell operates independently with its own local oscillator and frequency multiplication circuitry. This segmentation allows parallel operation of multiple cells, achieving high-frequency signal generation without requiring a single complex high-frequency stage
2Reliability
If multiple stages and high clock signal frequencies are used in existing DACs, then signal generation capability is improved, but power consumption increases
Solution Approach 1:
The patent changes the operating parameters by using lower frequency clock signals combined with frequency multiplication at the output stage of each cell. This approach allows the main DAC logic to operate at lower, more power-efficient frequencies while still achieving high-frequency output signals through the integrated frequency multiplication circuitry
3Speed
If frequency multiplication circuitry is integrated within each cell, then operating frequency is reduced, but circuit complexity per cell increases
Solution Approach 1:
The patent makes each DAC cell a universal building block that performs multiple functions: digital-to-analog conversion, local oscillation, frequency multiplication, and signal output. This multi-functionality distributes the complexity across many simple, identical cells rather than requiring complex centralized control logic
4Device complexity
If frequency multiplication circuitry is integrated within each cell, then number of components is reduced, but manufacturing precision requirements increase
Solution Approach 1:
Each DAC cell generates its own local oscillator signal and performs its own frequency multiplication, making the system self-sufficient at the cell level. This self-service approach eliminates the need for precise external frequency distribution and synchronization, as each cell operates independently with identical internal circuitry
Data Source
AI summary
The current disclosure is related to digital-to-analog converters (DACs) with localized frequency multiplication circuits. For example, an electronic device may include a local oscillator (LO) providing clock signals, a digital front-end providing digital signals, a DAC, (e.g., a radio frequency DAC (RFDAC)), and one or more antennas. The DAC may include a number of cells (e.g., unit power amplifiers). Moreover, each cell may provide a unit power analog signal upon activation with a higher frequency than the received digital signals and clock signals. The DAC may provide an output signal (e.g., an analog signal) based on combining (e.g., aggregating) the unit power analog signals of the activated cells for transmission by the one or more antennas.