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Transfer functions implemented by Gm-C filters depend on absolute values of transconductance and capacitances, which are greatly affected by variations in the fabrication process. Hence, a design procedure that makes the filter cutoff frequency precisely defined, despite the influences of fabrication process variations is necessary. This work develops a Phase-Locked Loop (PLL) in order to detect such...
We describe the design and development of an optoelectronic lock-in amplifier (LIA) for optical sensing and spectroscopy applications. The prototype amplifier is fabricated using Taiwan Semiconductor Manufacturing Co. complementary metal-oxide semiconductor 0.35-μm technology and uses a phototransistor array (total active area is 400 μm × 640μm) to convert the incident optical signals into electrical...
In this paper, we have presented a phase loop for controlling a chain of gm-C all-pass filters. It's called Delay Locked Loop for Analog Signal Processing, and it's used for signal's phase regulation. 0.35 ??m CMOS technology was used for design and verification of the circuit. According to the obtained results, we have concluded that it is possible to obtain a phase regulation in a wide frequency...
The phenomena of charge injection, clock feedthrough and charge sharing in charge pump are analyzed. A novel structure of charge pump for high-speed phase-locked loop is presented. The charge pump is designed with the Chartered 0.35 mum CMOS technology, and simulated with Eldo which is the analog circuits simulation tool of Mentor Graphics. Under 3.3 V DC supply voltage, the power consumption is 0...
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