Telefonaktiebolaget Lm Ericsson (publ)

Rolf M&aring;rtensson

Mats Goran Wilhelmsson

A phase locked loop includes at least one control circuit, where a voltage-controlled oscillator provides an output frequency which is arranged to strive to follow an input frequency. The phase locked loop also includes an outer, slow, negative feedback control circuit, having the input frequency as a setpoint, the output frequency as a process value and an outer output signal. The phase locked loop also includes an inner, fast, negative feedback control circuit, having the sum of a reference frequency from a stable oscillator and the outer output signal as a setpoint, the output frequency as the process value and an inner output signal for controlling the voltage controlled oscillator.

Growing community of inventors

Bandhagen, Sweden

Rolf Mårtensson

Growing community of inventors

Bandhagen, Sweden

Rolf M&aring;rtensson

Rolf Mårtensson