Vco - circuit with a wide output frequency range and pll - circuit with the vco - circuit

摘要

A voltage-controlled oscillation circuit (10) according to the present invention has a driver - voltage generating circuit (11), which an initial tension (vos, science) corresponding to a control voltage (of), and a ring oscillator circuit (20), which for the operation of a supply of said bias voltage (vos, science) receives. The drivers - voltage generating circuit (11), the initial stress generates (vos, science) with the use of a feedback circuit, which consists of an operational amplifier (12) is formed for the operation of the supply of a power supply voltage (vdd) receives. Therefore, the influence of a said power supply voltage (vdd) that is acted upon by high frequency portion, that is to say a influence of a disturbance suppressed, as a result of which a stable generating an output clock (clko) is made possible with a small phase variation.