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What is the conversion time for dual slope ADC?
Dual-slope converter. As an example, to obtain 10-bit resolution, you would integrate for 1024 (210) clock cycles, then deintegrate for up to 1024 clock cycles (giving a maximum conversion of 2 × 210 cycles).
How does ADC dual slope work?
As the name suggests, a dual slope ADC produces an equivalent digital output for a corresponding analog input by using two (dual) slope technique. The dual slope ADC mainly consists of 5 blocks: Integrator, Comparator, Clock signal generator, Control logic and Counter. This input voltage is applied to an integrator.
What is the meaning of dual slope in dual slope ADC?
In dual slope type ADC, the integrator generates two different ramps, one with the known analog input voltage VA and another with a known reference voltage –Vref. Hence it is called a s dual slope A to D converter.
What is ADC integration time?
An integrating ADC is a type of analog-to-digital converter that converts an unknown input voltage into a digital representation through the use of an integrator. The input voltage is computed as a function of the reference voltage, the constant run-up time period, and the measured run-down time period.
What is the main drawback of dual slope ADC?
Its main disadvantage is a slow conversion rate, often in the range of 10 samples/second. In applications where this is not a problem, such as in measuring temperature transducers, a dual-slope ADC is a good choice.
What is the significant of the name dual slope method?
What is the significance of the name dual slope method? Explanation: The input signal is integrated only for a fixed interval of time and this is the basis for the dual slope method. Reference voltage is integrated with a negative slope. Hence the method is known as dual slope integrating type DVM.
What are the advantages of a dual slope ADC?
The dual-slope ADC has many advantages. Noise present on the input voltage is reduced by averaging. The value of the capacitor and conversion clock do not affect conversion accuracy, since they act equivalently on the up-slope and down-slope.
How is clock frequency related to slope of ADC?
The accurate correspondence of this ADC’s output with its input is dependent on the voltage slope of the integrator being matched to the counting rate of the counter (the clock frequency). With the digital ramp ADC, the clock frequency had no effect on conversion accuracy, only on update time.
Which is an example of a dual slope converter?
Another common ADC is the dual-slope converter, which relies on integration. As shown in Figures 4-10a and 4-10b, the voltage to be measured ( Vx) is input to an integrator, charging the capacitor for a fixed time interval t1, which corresponds to a certain number of clock cycles.
How does single slope ADC escape calibration drift?
This technique of analog-to-digital conversion escapes the calibration drift problem of the single-slope ADC because both the integrator’s integration coefficient (or “gain”) and the counter’s rate of speed are in effect during the entire “winding” and “unwinding” cycle portions.