Corres-Matamoros, AntonioMartínez-Guerrero, EstebanRayas-Sánchez, José E.2019-08-292019-08-292017-06A. Corres-Matamoros, E. Martínez-Guerrero and J. E. Rayas-Sanchez, "A programmable CMOS voltage controlled ring oscillator for radio-frequency diathermy on-chip circuit," 2017 International Caribbean Conference on Devices, Circuits and Systems (ICCDCS), Cozumel, 2017, pp. 65-68. doi: 10.1109/ICCDCS.2017.79597212165-3550http://hdl.handle.net/11117/5998In this work we present the design of a digitally controlled ring type oscillator in 0.5 μm CMOS technology for a low-cost and portable radio-frequency diathermy (RFD) device. The oscillator circuit is composed by a low frequency ring oscillator (LFRO), a voltage controlled ring oscillator (VCRO), and a logic control. The digital circuit generates an input signal for the LFO, which generates a voltage ramp that controls the oscillating output signal of the VCRO in the range of 100 KHz to 1 MHz. Simulation results show that the proposed circuit exhibits controllable output characteristics in the range of 100 KHz – 1 MHz, with low power consumption and low phase noise, making it suitable for a portable RFD device.engLow-frequency OscillatorVoltage-controlled OscillatorRing OscillatorRadio-frequency DiathermyRFDinfo:eu-repo/semantics/article