Positive Feedback - The use of positive feedback is useful for producing oscillators. The condition for positive feedback is that a portion of the output is combined in phase with the input. For an amplifier with positive feedback the gain is given by the expression below. __ Designed by Carl R. Rod Nave Department of Physics and Astronomy Georgia State University Atlanta, Georgia 30302-4106 EmailRodNave @ gsu.edu Resonant Frequency of a Colpitts Oscillator - Using a circuit from the RF schematics section, and the formula from the theory section, you can calculate the resonant frequency for the Colpitts oscillator __ Designed by Andy Collison
RF front-end for triple conversion GPS receiver - A low-power, 1.57-GHz RF front-end for a global positioning system (GPS) receiver has been designed in a 1.0- m BiCMOS
technology. It consists of a low noise amplifier with 15 dB of gain, a single balanced mixer with 6.3 mS of conversion gm, a Colpitts LC local oscillator, and an emitter coupled logic (ECL) divide-by-eight prescaler. This front-end has a signal sideband (SSB) noise figure of 8.1 dB and is part of a triple conversion superheterodyne receiver whose IF frequencies are 179, 4.7, and 1.05 MHz. Low power consumption has been achieved, with 10.5 mA at 3-V supply voltage for the front-end, while the complete receiver is expected to draw about 12 mA __ Designed by Francesco Piazza & Qiuting Huang
Two Stage Chaotic Colpitts Oscillator for the UHF range - Chaos in the Colpitts oscillator was first reported at the kilohertz frequencies [1]. Later the circuit was investigated in the high frequency (HF: 3 to 30 MHz) range [2, 3]. Chaotic oscillations were demonstrated. __
Ultra Low Voltage Nanopower LC Colpitts Oscillator - Circuit Ideas for Designers App Note__ Advanced Linear Devices, Inc
Use of the CMOS
Unbuffered Inverter in Oscillator - Texas Instrument Application ReportSZZA043 January 2004 __ Designed by Moshiul Haque and Ernest Cox
Voltage Controlled Oscillator VCO - The oscillation frequency of the voltage controlled oscillator is controlled by the output of the PLL synthesizer and does the stable oscillation of 119.3 MHz __ Designed by Seiichi Inoue |