A Bulk-Controlled Low-Voltage CMOS Quadrature Oscillator

TL;DR

This paper introduces a novel method for controlling the frequency of a CMOS quadrature oscillator by adjusting the bulk bias voltage of PMOS transistors, validated through simulations and experiments.

Contribution

It presents a new bulk-control technique for low-voltage CMOS quadrature oscillators, enhancing frequency tuning capabilities.

Findings

Effective frequency control demonstrated in simulations.

Experimental validation with discrete components confirms the method.

Technique suitable for low-voltage applications.

Abstract

In this paper, an schema for controlling the oscillation frequency of a quadrature oscillator is proposed. The method involves controlling the threshold voltage of the PMOS transistors in the inverter through control of the bulk bias voltage. Results obtained using HSPICE simulation are presented in a technology of 0.35{\mu}m, and experimental results using discrete elements (HEF4007) are also shown. Both sets of experiments show the effectiveness of the technique.