Design and Analysis of Frequency Synthesizer for Implantable Cardioverter Defibrillator (ICD) in 90 NM Technology

Abstract

This article briefs on a low power 450 MHz a PLL-based frequency synthesizer for implantable medical devices (IMD). The technological devices inserted into human bodies to monitor and conduct medical diagnosis. Regular monitoring of normal functionality of the bodily physiological signals, such as hypertension, temperature, electrocardiograms, etc., is necessary for medical diagnoses. The charge pump circuit’s current mismatching problem is resolved and the frequency synthesizer’s power consumption is reduced by using a voltage-controlled LC oscillator with current reuse (CRVCO) and the cascaded gm boosting approach. At an output frequency of 450 MHz, the designed frequency synthesizer uses 0.223 mW of power. According to the test results, a 1. 2V supply voltage (VDD) corresponds to 0.45 mW/GHz is the Figure-of-merit (FOM)power.