The monostable circuit (48) maintains the first comparator output level constant until the APD (22) has recharged.
The second comparator (C2) is also connected to a monostable circuit (48) arranged to latch the first comparator output response to resetting.
Disclosed are an NFC mobile terminal and an NFC mobile phone, including an NFC chip, a key, and a monostable trigger circuit.
The key is connected to the NFC chip via the monostable trigger circuit and further used for starting up the NFC function of the NFC mobile terminal when the NFC terminal is shut down.
The detection system includes an ion detector, a comparator/discriminator, a mono-stable circuit and a counter.
A single-shot circuit (24) generates a signal of accurate pulse width by using the signal output from a reference oscillator in a frequency synthesizer (20).
For example, an edge-triggered one-shot circuit can be used to generate a reference clock from the preamble until lock is detected.
A monostable (48) and latch (50) discriminate which sensor produced the output signal, making use of the inherent time delay between the two sensor signals.
By means of a one-shot circuit (OS) the electronic switch (18) is driven into conduction during a fixed portion of the time period during which the diode (16) would be conductive without the electronic switch (18).
The extension of the dead time occurs because the mono-stable circuit requires a rising edge to trigger and can only be triggered again after the output pulse from the comparator/discriminator has gone low.