Contents
When does an ADC accept a differential signal?
Though ADCs with differential inputs can accept single-ended input signals, optimum ADC performance is achieved when the input signal is differential.
How to increase the dynamic range of an ADC?
There are a number of other ways to increase the dynamic range of an ADC, such as operating multiple ADCs in parallel and digital postprocessing the output to get the averaged result or using programmable gain amplifiers.
How does oversampling increase the dynamic range of SAR ADCs?
Increasing the oversampling ratio (OSR) results in overall reduced noise and the DR improvement due to oversampling is ΔDR = 10log10 (OSR) in dB. Besides oversampling with a Δ-Σ ADC, oversampling a high throughput SAR ADC can improve antialiasing and reduce overall noise.
Which is the ideal closed loop gain for differential ADC?
The ideal closed-loop gain for a differential ADC driver with matched feedback factors is seen in Equation 9. Output balance, an important performance metric for differential ADC drivers, has two components: amplitude balance and phase balance.
How is a receive chain used in a differential filter?
It is used for rejecting the aliasing signals along with the spurs generated by active components. The spurs include harmonics and IMD products, among others. With the filter, the receive chain can provide high SNR signals for the ADC to analyze.
Which is the output terminal of a differential amplifier?
Differential amplifier. A basic fully differential voltage-feedback ADC driver is shown in Figure 1. Two differences from a traditional op-amp feedback circuit can be seen. The differential ADC driver has an additional output terminal (V ON) and an additional input terminal (V OCM ).
What makes an ADC a high precision circuit?
These ADCs are fundamentally characterized by their overall metrological precision, which relates both to the static (dc) and dynamic (ac) parameters, and therefore the converters and the accompanying analog conditioning circuitry in these systems must have top tier specifications.
Is there an applet for aliasing in an A / D converter?
An applet for demonstrating aliasing effects in idealized A/D converters. The applet above illustrates aliasing and its suppression through filtering and oversampling in a classic (non-sigma-delta) A/D converter. An ideal ADC is assumed – distortion free, unlimited bandwidth, etc. – in order to focus solely on aliasing effects.
Which is an ideal assumption for an ADC?
An ideal ADC is assumed – distortion free, unlimited bandwidth, etc. – in order to focus solely on aliasing effects. The input signal is also assumed to be noise free, but the most practical use of this applet is to find a combination of filtering and oversampling that pushes aliasing below the noise floor of the input, or the system overall.
Do you need a controlled impedance connection with an ADC?
The driver is generally placed close to the ADC, so controlled-impedance connections are not required between them; but the incoming signal connection to the ADC driver input is often long enough to require a controlled-impedance connection, terminated in the proper resistance.