US 2006/0145769 A1 · VCO center frequency tuning and limiting gain variation

Abstract

This invention describes a method for simultaneous precise center frequency tuning and limiting a gain variation of a voltage controlled oscillator (VCO) of a phase locked loop (PLL) of an electronic device (e.g., a communication device, a mobile electronic device, a mobile phone, etc.). The invention utilizes frequency measurements and arithmetical optimizations. More specifically, the invention implementation is based on an analysis which includes measuring a frequency of a VCO and calculating a gain of the voltage controlled oscillator (VCO) using a predetermined criterion. The key element for implementing said analysis is a control and arithmetic block. The present invention can be used in any radio architecture that requires limiting of the VCO gain variation and tuning its center frequency.

Claims27

Dependent claims

A method for simultaneous center frequency tuning and limiting a gain variation of a voltage controlled oscillator (VCO) of a phase locked loop (PLL), comprising the steps of:

providing a VCO output signal (24) of said voltage controlled oscillator to a calibration control module of said phase locked loop (PLL);
providing a reference frequency signal containing a stable reference frequency to said calibration control module;
and
generating in response to said VCO output signal and to said reference frequency signal by said calibration control module and providing to said voltage controlled oscillator a VCO tuning voltage signal and a calibration signal for simultaneously implementing said center frequency tuning of said VCO output signal and said limiting of said gain variation of said voltage controlled oscillator (VCO) according to a predetermined criterion.

1 more element

An electronic device capable of simultaneous center frequency tuning and limiting a gain variation of a voltage controlled oscillator (VCO) of a phase locked loop (PLL), comprising:

a voltage controlled oscillator, for providing a VCO output signal;
a reference frequency block (15), for providing a reference frequency signal containing a stable reference frequency;
and
a calibration control module, responsive to said VCO output signal and to said reference frequency signal, for providing a VCO tuning voltage signal and a calibration signal to said voltage controlled oscillator for simultaneously implementing said center frequency tuning and said limiting of said gain variation of said VCO output signal of said voltage controlled oscillator (VCO) according to a predetermined criterion.

1 more element

Dependencies are inferred from the claim text.

VCO center frequency tuning and limiting gain variation

Life of this patent

VCO center frequency tuning and limiting gain variation

Life of this patent

Abstract

Claims27