Digital Techniques: Zero-Level Detector

What happens to the amplifier state when the sine wave input crosses zero and goes positive?

It is driven to its opposite state

What is the purpose of the zero-level detector?

To produce a square wave from a sine wave

How can the zero-level detector be modified to detect voltages other than zero?

By connecting a fixed reference voltage to the inverting input

What is the configuration of the op-amp in a non-inverting amplifier?

Closed-loop configuration Signup and view all the answers

What is the purpose of the feedback circuit in a non-inverting amplifier?

To apply the output back to the inverting input Signup and view all the answers

What is the overall circuit resistance of two parallel resistors of equal value in an R/2R ladder DAC circuit?

Half of the value of an individual resistor Signup and view all the answers

What is the most significant bit (MSB) in the R/2R ladder DAC circuit?

S1 Signup and view all the answers

What is the purpose of Analogue to Digital Conversion (ADC) in a system?

To convert analogue signals to digital signals Signup and view all the answers

How many comparators are required to convert a 0 to 9-V range to a binary number?

9 Signup and view all the answers

What is the relationship between the number of binary bits and the number of comparators required?

The number of comparators increases exponentially with the number of binary bits Signup and view all the answers

How many comparators are required for a typical 8-bit circuit?

255 Signup and view all the answers

What is a significant limitation of the flash ADC approach?

It requires a large number of comparators, making it component-intensive Signup and view all the answers

What is the primary advantage of the flash ADC over other ADC technologies?

It is the most efficient in terms of speed Signup and view all the answers

What is the result of having a large change in angle for little change in fuel level at the extremities of the fuel tank?

A large change in output voltage. Signup and view all the answers

How can the highest-order-input selection effect be realised in a flash ADC?

Through a set of Exclusive-OR (XOR) gates Signup and view all the answers

What is the purpose of adjusting the value of the resistors in the reference voltage divider network?

To make each change of Binary 1 at the output represent the same change in fuel quantity. Signup and view all the answers

What is the effect of having unequal-value resistors in the reference voltage divider network?

A nonlinear response to the analogue input signal. Signup and view all the answers

What is the advantage of using equal-value resistors in the reference voltage divider network?

A proportional response to the analogue input signal. Signup and view all the answers

What is a key characteristic of the sequential comparator output states in a flash ADC?

Each comparator saturates 'high' in sequence from lowest to highest Signup and view all the answers

What is a possible implementation of the encoder circuit in a flash ADC?

A matrix of diodes Signup and view all the answers