Monolithically integratable phase shifter vco

Abstract

A phase shifter VCO has at least first and last fundamental circuits each including an amplifier adding circuit, a control input connected to all of the other control inputs for a tuning potential varying an amplification operative ratio between the first input and the output to the second input and the output of the adding circuit, a reference input for a reference potential, symmetrical first and second non-inverting and inverting circuit input pairs, a symmetrical non-inverting and inverting circuit output pair, and a symmetrical timing element having an input connected to the first circuit input and having an output forming the first input of the adding circuit. The first non-inverting input of the first fundamental circuit is connected to the non-inverting output of the last fundamental circuit, and the first inverting input of the first fundamental circuit is connected to the inverting output of the last fundamental circuit. The non-inverting output of the first fundamental circuit is connected to the first inverting input of the last fundamental circuit and to the second inverting inputs of all of the fundamental circuits, and the inverting signal output of the first fundamental circuit is connected to the first non-inverting input of the last fundamental circuit and to the second non-inverting inputs of all of the fundamental circuits. At least one of the signal outputs of at least one of the fundamental circuits forms a signal output of the phase shifter oscillator.