DELAY CIRCUIT AND RING OSCILLATOR TYPE VOLTAGE CONTROLLED OSCILLATING CIRCUIT

摘要

PROBLEM TO BE SOLVED: To ensure an oscillation frequency variable range with a little margin by reducing the influence of variations in transistor elements constituting a delay circuit 1.

SOLUTION: A delay circuit includes: a third transistor element Q3 with a source and a drain connected to those of a second transistor Q2 respectively; and a bias generation circuit 10 which is connected to a gate of the third transistor element Q3 and applies a bias voltage for correcting variations in the characteristics of transistor elements to the gate of the third transistor element Q3. The bias generation circuit 10 includes at least one transistor element Q6 formed from the same substrate as the delay circuit 1 and generates the bias voltage using the transistor element Q6.

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