Discussion Overview
The discussion revolves around the design of an ultralow power, narrow band Analog-to-Digital Converter (ADC) with specific requirements: a 20MHz input frequency, a bandwidth of 20MHz, an effective number of bits (ENOB) greater than 4, and a power consumption of less than 1mW. Participants explore various architectures and approaches suitable for these specifications.
Discussion Character
- Exploratory
- Technical explanation
- Debate/contested
- Mathematical reasoning
Main Points Raised
- One participant suggests that to convert a 20MHz signal, a converter operating at 40Msps is needed, or two converters at 20Msps, noting that the best commercial unit available operates at 50mW for 8 bits.
- Another participant proposes using a resistive divider with 15 comparators, but highlights that this configuration would consume about 45mW, which exceeds the power requirement.
- Some participants discuss the possibility of reducing power consumption through signal preprocessing, asking for more details about the signal modulation characteristics.
- A later reply mentions the potential of a 4-bit ADC design using a flash architecture, which would require only 15 comparators, depending on the fabrication process used.
- References to existing literature are provided, including a specific paper on a low power asynchronous SAR ADC that could be relevant to the design challenge.
- One participant questions whether the original poster intends to design an integrated circuit (IC), suggesting that the search for suitable ADCs may not have been thorough enough.
- Another participant references a discussion on very low power SAR ADCs, indicating that various methods, including switched capacitors, could be explored.
Areas of Agreement / Disagreement
Participants express differing views on the feasibility of achieving the specified power consumption with the desired performance. While some suggest potential architectures, there is no consensus on a definitive solution or approach.
Contextual Notes
Participants note limitations related to the power consumption of proposed architectures and the dependency on specific fabrication processes. There are also unresolved questions regarding the modulation of the input signal, which could influence design choices.
Who May Find This Useful
Individuals interested in low-power electronics design, particularly in the context of ADCs, as well as those exploring innovative approaches to signal processing and circuit design.