What is clock feedthrough and charge injection?
A basic charge injection/clock feedthrough model is first introduced to identify key components and explain fundamental behavior. This model is expanded upon by using Technology Computer Aided Design (TCAD) simulations, which can more accurately model the distribution of channel charge.
How can charge injection be reduced?
A small-geometry switch, slow switching rate, and small source resistance can help reduce the charge injection effect.
What is charge feedthrough?
In digital electronics, clock feedthrough is the coupling of the clock signal to the nodes where coupling is not intended. Such coupling happens because of the gate-to-source capacitance, interconnects parasitic capacitance or because of the substrate coupling.
What is charge injection?
Charge injection occurs in a switched-capacitor. circuit when the transistor turns off and disperses channel charge into the source and. drain. The source, which is the sampling capacitor, experiences an error in the sampled. voltage due to the incoming channel charge.
What is charge injection capacity?
The charge injection capacity is measured from the change in electrode potential when a current pulse is applied. The charge injection capacity is related to CSC, with larger CSC generally resulting in a larger charge injection capacity (smaller change in potential during a current pulse).
What is charge injection device?
A solid-state imaging device utilizing an image sensor composed of a two-dimensional array of coupled MOS (metal-oxide semiconductor) charged storage capacitors and designed to convert near-infrared energy to electrical signals, providing broad gray shade or tonal rendition.
What is clock feedthrough effect?
Which are errors contributes by charge injection in MOS sampling circuits?
The major error mechanism in charge storing is known as charge injection. When a MOS switch is turned off, the channel charge is evacuated through source and drain terminals. This charge can alter the voltage stored on a capacitor, resulting in data accuracy loss.
How is charge injection capacity measured?
The maximum reversible charge injection capacity per unit area is determined by analyzing voltage transients (VTs). This technique consists of applying a controlled current pulse to the WE while measuring its voltage relative to the RE.
What is a CID detector?
CID detectors were originally developed by General Electric in 1972 for use in imaging cameras, typically capturing images of space. They enabled astronomers to capture long exposures of distant bodies without the light from nearby stars saturating the image.
How does a CID detector work?
CIDs and CCDs are both composed of doped silicon wafers, containing a two dimensional array of light sensitive elements called pixels. When polychromatic light passes from the plasma through the optical spectrometer it is separated in to constituent wavelengths and then focused onto the detector.
How do you solve a feedthrough clock?
Methods to reduce clock feedthrough include:
- Slew rate reduction of the clock signal, usually by the resistor in series with the controlled gate.
- Reduction of the voltage swing of the clock signal.
- Reduction of the interconnects parasitic capacitance by rerouting interconnects.
