What is Tiq comparator?
Threshold inverter quantizer (TIQ) comparator uses a built-in reference voltage (threshold voltage). Threshold voltage is the point where is the static input voltage equals to the static output voltage V_\mathrm{in}=V_\mathrm{out} [24].
What is function of comparator in flash type ADC?
The comparator is a major block used in the flash ADC for analog to digital conversion. The use of comparators count is varied depends on the resolution of the flash ADC. Comparator count increases as 2n for an n-bit resolution flash ADC.
How many comparators are in the flash ADC?
This three-bit flash ADC requires seven comparators. A four-bit version would require 15 comparators. With each additional output bit, the number of required comparators doubles.
Why it is called flash ADC?
A flash ADC (also known as a direct-conversion ADC) is a type of analog-to-digital converter that uses a linear voltage ladder with a comparator at each “rung” of the ladder to compare the input voltage to successive reference voltages.
Why is flash ADC the fastest?
1)It is the fastest type of ADC because the conversion is performed simultaneously through a set of comparators, hence referred as flash type ADC. Typical conversion time is 100ns or less. 2)The construction is simple and easier to design.
How many comparators are required for 8bit parallel ADC?
256 comparators
An 8-bit ADC, for example, will require 256 comparators (28 = 256).
How many comparators do I need?
A number of comparators used for N-bit Flash type ADC are (2N -1) and, so for 4 bit Flash type ADC will require 15 no. of the comparator. Flash type ADC requires (2N × N) priority encoder and 2N no. of the resistor, so for 4-bit flash type ADC requires 16 × 4 priority encoders and 16 resistors.
How many comparators are used in 2 bit ADC?
If we now create a 2-bit ADC, then we will need 22– 1 which is “3” comparators as we need four different voltage levels corresponding to the 4 digital values required for a 4-to-2 bit encoder circuit as shown.
Why flash type ADC is fastest?
A flash type ADC produces an equivalent digital output for a corresponding analog input in no time. Hence, flash type ADC is the fastest ADC. The 3-bit flash type ADC consists of a voltage divider network, 7 comparators and a priority encoder.
How many comparators are used for a 6 bit flash type ADC?
63 numbers
A 6-bit Flash ADC requires 63 numbers of comparator at the input side of the block diagram.
How many comparators are required in an N-bit flash ADC?
An n-bit flash ADC applies the input voltage to an array of 2n – 1 comparators, via a ladder of 2n resistors.
Why is it called flash ADC?
Introduction. Flash analog-to-digital converters, also known as parallel ADCs, are the fastest way to convert an analog signal to a digital signal. Flash ADCs are suitable for applications requiring very large bandwidths.
Which ADC has highest accuracy?
Detailed Solution. Dual slope integration type ADC has the highest accuracy.
Why flash type ADC is faster?
What is TIQ comparator in ADC?
TIQ comparators compare the input signal with internal built threshold, it eliminates the need for power hunger resistor ladder network. An n-bit flash ADC requires 2-n-1 number of TIQ comparators. TIQ output is thus encoded into a binary value using an encoder.
What is the DNL of the TIQ flash ADC?
The high speed and low power TIQ flash ADC architecture is designed and simulated using level 3 spice models. The ADC is designed with a 4 bit resolution and is simulated in 0.12 μm standard CMOS that offers a high data conversion rate of 4 Giga Samples/sec. Differential (DNL) errors measured are between -0.174 LSB to +0.256LSB.
What is the power consumption of a TIQ comparator?
The ADC has been designed in CMOS 90nm technology using Cadence virtuoso and cadence specter based simulation result shows that TIQ comparator significantly lowers the power consumption i.e. 1.7 uW and 7.54 uW and conversion speed 342 us and 328 us for 2-bit and 4-bit respectively. … … … …