Position: Index > Unclassified >

A current mode deglitcher circuit

2017-08-15 21:11  
Declaration:We aim to transmit more information by carrying articles . We will delete it soon, if we are involved in the problems of article content ,copyright or other problems.

The deglitcher presented here is based on current mode circuitry. The output is provided in the form of a current which eliminates the need for a buffer. A high speed is achieved by employing parallelism. The circuit
does not rely on matching, which makes it very robust and eliminates the need for calibration.Glitch has been a universal slang expression among electronics people for an unwanted transient condition. In D/A converters, the word has achieved semiofficial status for an output transient, which occurs when the digital input addressed is changed. The sample/hold amplifier does double duty, serving as a buffer amplifier as well as a glitch remover, delaying the output by 1/2-clock cycle. The sample/hold can be used to remove many other types of glitches in a system. If a delayed sample pulse is required, it can be generated using a dual monostable multivibratorIC .A current mode track-and-hold circuit designed for deglitching a 14-bit current steering DAC is presented. The deglitcher is based on a developed highly linear current memory. The prototype circuit is designed using a 0.35-µm BiCMOS (SiGe) technology. According to measurements, a -66.8-dBc THD is achieved with a 9.1-MHz input signal and 30-MHz clock frequency. Two-tone test gives intermodulation levels below 68 dBFS at 40-MS/s sampling rate. The power dissipation is 360 mW from a 3-V power supply.