A VHF Oscillator Design Based on BJT Active Load Differential Amplifier

Author

Tsai, Cher-Shiung ; Guo, Ming-Yuan ; Chang, Chien-Hua ; Jiang, Shu-Yin ; Lin, Ming-Hsin ; Gan, Kwang-Jow ; Chang, Pei-Hua ; Liang, Dong-Shong ; Chen, Yaw Hwang

Author_Institution

Kun Shan Univ., Tainan

fYear

2007

fDate

20-22 Dec. 2007

Firstpage

917

Lastpage

920

Abstract

In this paper, we present a VHF (Very High Frequency) band oscillator which mainly composed of a BJT active load differential amplifier (Diff. amp). We use H-spice to verify that the active load differential amplifier oscillator output frequency is 900 MHz at 2.0 volts power supply under CIC 0.18 um-Si process. We also use discrete devices on bread board to prove the circuit is an oscillator circuit. Those experiments show such an oscillator can work stably from 3.8 to 5.9 volts. Their output frequency will be 161.1 MHz, 186.7 MHz under 3.8 volts and 5.9 volts respectively. We use FFT (Fast Fourier Transform) diagram to analyse these oscillators and shows SNR (Signal-to-Noise Ratio) values. Finally, those experimental results reveal that the oscillator is a nice voltage controlled oscillator (VCO) and also have good SNR characteristics.

Keywords

VHF oscillators; bipolar transistors; differential amplifiers; voltage-controlled oscillators; BJT; BJT active load differential amplifier; FFT; H-spice; SNR; VCO; VHF oscillator design; fast Fourier transform; signal-to-noise ratio; voltage controlled oscillator; CMOS logic circuits; Design engineering; Differential amplifiers; Frequency; Gallium nitride; Inverters; MOS devices; Power supplies; Switches; Voltage-controlled oscillators; Diff Amp; EFT; SNR; VCO;

fLanguage

English

Publisher

ieee

Conference_Titel

Electron Devices and Solid-State Circuits, 2007. EDSSC 2007. IEEE Conference on

Conference_Location

Tainan

Print_ISBN

978-1-4244-0637-1

Electronic_ISBN

978-1-4244-0637-1

Type

conf

DOI

10.1109/EDSSC.2007.4450275

Filename

4450275