A UHF CMOS Gm-C bandpass filter and automatic tuning design

Abstract

A CMOS Gm-C bandpass filter using improved Nauta's transconductor and its matched oscillator are presented. The filter can be operated at ultra high frequency (UHF) band with a high quality factor. Quality factor and frequency tuning is also considered. The simulated results show that the center frequency of the filter using TSMC 0.18µm CMOS process can be operated at about 800MHz under 3.3V supply. To match the filter, the oscillator designed is based on the archetype of the filter and the simulation presents that they are in a good match. An application of the above filter and oscillator in a phase lock loop (PLL) technique for continuous time auto-tuning filter is simply introduced.

A Cyber-Vigilance System for Anti-Terrorist Drives Based on an Unmanned Aerial Vehicular Networking Signal Jammer for Specific Territorial Security

“…To self-calibrate the jamming process, the radio transmitter is housed with the band-pass filter and the overall jammer set-up is attached to the surface of the vehicle. According to the design considerations and technology proposed in [4], TSMC 0.18 µm CMOS fabrication process based Gm-C band-pass filter module is used where active transconductor components and six CMOS inverters are incorporated. The quality factor is maintained more than 40 and the adjustable center frequency of the operating bandwidth can be configured within the range of 797.4 MHz to 819.5 MHz.…”

“…The automatic tuning procedure is enabled following an analog Phase-Locked-Loop (PLL) technique based on an adaptive integrated Voltage-Controlled-Oscillator (VCO). As described in [4], an inherently symmetric improved Nauta's Transconductor building block is introduced. The improved Nauta's Transconductor configuration, device parameters, equivalent circuit of the fabricated Gm-C band-pass filter, analog PLL topology for automatic frequency tuning system, architecture of the adaptive VCO and relative performance evaluation are presented in [4].…”

“…As described in [4], an inherently symmetric improved Nauta's Transconductor building block is introduced. The improved Nauta's Transconductor configuration, device parameters, equivalent circuit of the fabricated Gm-C band-pass filter, analog PLL topology for automatic frequency tuning system, architecture of the adaptive VCO and relative performance evaluation are presented in [4]. The signal jammer-cum-adaptive band-pass filter module tunes its center frequencies within an approximate range of 797 MHz to 819 MHz with a unity gain and it blocks other frequency signals as the commensurate suppressing noise parameters.…”

“…The process of the autonomous concatenated map generation of the traversed region is described in [2] and [3]. The auto center frequency reconfigurable bandpass filter to substantiate networking signal jammer is based on a novel design proposed in [4] where an ultra high frequency and high quality factor integrated Gm-C technology based bandpass filter is presented which is fabricated using the modified Nauta's Transconductor principle. Traditionally, a signal jammer enacts the role of an adaptive source of interfering noise suppressed onto a propagating message signal at the node of eavesdroppers so that the confidentiality of the relevant wireless protocol is maintained by not allowing any outsider to decode the inherent messaging information.…”