Title :
Comparison of Two Filtering Techniques in Differential LC VCO Using Asymmetric Tank Structure
Author :
Lee, Sang-Yeol ; Son, Byung-Kook ; Ko, Jae-Wook ; Kim, Dae-Heum ; Shrestha, Bhanu ; Kim, Nam-Young
Author_Institution :
Kwangwoon Univ., Seoul
Abstract :
This paper presents two InGaP/GaAs HBT differential cross coupled VCOs designed with low phase noise for adaptive feedback-interference cancellation systems (AF-ICS). The main idea is using low pass and band pass filtering technique for noise frequency. With this the designed VCO, Is´ one achieved a phase noise of -130.40 dBc/Hz at 1 MHz offsets from the carrier frequency of 1.619 GHz and 2nd one achieved - 127.93 dBc/Hz at 1 MHz offsets from the carrier frequency of 1.604 GHz. Each VCO dissipates output power of-6.68 dBm and -10 dBm by supplying 5 V. Two pairs of BC junction diode are used as varactor to get a broad band tuning range for both VCOs.
Keywords :
III-V semiconductors; UHF filters; UHF oscillators; band-pass filters; circuit tuning; gallium arsenide; heterojunction bipolar transistors; low-pass filters; phase noise; varactors; voltage-controlled oscillators; BC junction diodes; HBT differential cross coupled VCO; adaptive feedback-interference cancellation systems; asymmetric tank structure; band pass filtering technique; broadband tuning; differential LC VCO; frequency 1.619 GHz; low pass filtering technique; phase noise; varactors; voltage 5 V; Adaptive systems; Band pass filters; Filtering; Frequency; Gallium arsenide; Heterojunction bipolar transistors; Noise cancellation; Phase noise; Power generation; Voltage-controlled oscillators; Filtering technique; asymmetric inductance tank; heterojunction bipolar transistor (HBT); phase noise; symmetric capacitance;
Conference_Titel :
Microwave Conference, 2007. APMC 2007. Asia-Pacific
Conference_Location :
Bangkok
Print_ISBN :
978-1-4244-0748-4
Electronic_ISBN :
978-1-4244-0749-1
DOI :
10.1109/APMC.2007.4554708
