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10 MHz CMOS OTA-C voltage-controlled quadrature oscillator

10 MHz CMOS OTA-C voltage-controlled quadrature oscillator

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© The Institution of Electrical Engineers
Published

A quadrature-type voltage-controlled oscillator with operational transconductance amplifiers and capacitors (OTA-C is presented. A monolithic integrated CMOS test circuit is introduced to verify theoretical results. The attainable frequency range of oscillation of the chip test circuit is 3–10.34 MHz. The total harmonic distortion (THD) is 020– 1.87% for corresponding peak-to-peak amplitude voltages between 100 mV and 1 V. This amplitude can be controlled either by using a diode connection of two MOS transistors or a proposed nonlinear resistor.

Inspec keywords: variable-frequency oscillators; CMOS integrated circuits; operational amplifiers

Other keywords: 3 to 10.34 MHz; operational transconductance amplifiers; peak-to-peak amplitude voltages; monolithic integrated CMOS test circuit; voltage-controlled quadrature oscillator; nonlinear resistor; total harmonic distortion; diode connection

Subjects: CMOS integrated circuits; Oscillators

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      • A. Nedungadi , R.L. Geiger . High-frequency voltage-controlled continous-time lowpass filter using linearised CMOS integrators. Electron.Lett. , 729 - 730
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