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ADC Resolution - Coggle Diagram
ADC Resolution
Advantages
High speed
Input-to-output conversion almost instantaneous
Ideal for fast-changing signals
No clock required
Works asynchronously
Reduces timing circuitry complexity
Small input-to-output delay
Suitable for high-speed applications
Video signal conversion
Digital audio sampling
Other applications needing rapid conversion
Comparator & Encoder Operation
Comparator outputs
If output = 1, all less significant outputs = 1
Converts analog voltage to preliminary digital code
Priority Encoder
Encodes most significant '1'
Converts to standard binary number
Used in floating-point mantissa detection
Voltage conversion
Positive voltages → digital values
Negative voltages → require extensions
ADC Resolution
Bits
Resolution measured in bits
Example: 16-bit ADC for audio
Voltage step
Q = (V_FSR) / n
V_FSR: full-scale voltage
n: number of voltage intervals
Disadvantages
Speed-limited for high-frequency applications
Not ideal for video or RF signals
Conversion rate constrained by SAR and D/A circuitry
Slower than Flash ADC
Requires O(log₂(n)) steps for conversion
Input-to-output delay accumulates for high resolution
Extensions & Related ADCs
Pipelined ADCs
Chain of small-bit converters
Residue passed to next stage
Improves throughput but adds latency
Integrating ADCs
Two-phase measurement
integrate input over t1 → Vout ∝ Vin·t1
decrement at constant rate