What is a peak detector used for?
Definition: Peak detector circuits are used to determine the peak (maximum) value of an input signal. It stores the peak value of input voltages for infinite time duration until it comes to reset condition.
What is the function of phase detector?
A phase detector or phase comparator is a frequency mixer, analog multiplier or logic circuit that generates a voltage signal which represents the difference in phase between two signal inputs. It is an essential element of the phase-locked loop (PLL).
What is the function of hold circuit?
In electronics, a sample and hold (also known as sample and follow) circuit is an analog device that samples (captures, takes) the voltage of a continuously varying analog signal and holds (locks, freezes) its value at a constant level for a specified minimum period of time.
How to choose a Schottky diode for input protection?
A good protection to use is the dual series Schottky devices that have 3 terminals. You connect them from VSS to the pin, to VDD. The MAZ793, from panasonic, is a very nice and small one.
How is a Schottky diode formed in a junction?
A Schottky barrier diode is a metal-semiconductor. A junction is formed by bringing metal contact with a moderately doped N-type semiconductor material. The Schottky barrier diode is a unidirectional device conducting current flows only in one direction (Conventional current flow from the metal to the semiconductor)
Can a Schottky be used as an ESD resistor?
Although Schottkys are very fast diodes, ESD wavefronts dv/dt can be extremelly large, and the 100R series resistor will form a RC pole with the pin capacitance, enhancing the chip robustness to ESD. As kalpak said, the Schottky will dump the under/over voltage to the power supply.
How is the reverse recovery charge measured on a Schottky diode?
It is the time taken to switch the diode from its forward conducting or ‘ON’ state to the reverse ‘OFF’ state. The charge that flows within this time is referred to as the ‘reverse recovery charge’. The time for this parameter for a Schottky diode is normally measured in nanoseconds, ns.