Koninklijke Philips Corporation N.v.

U.S. Philips Corporation

Stepmind

Fabrice Jovenin

David Canard

Pascal Philippe

Dominique Brunel

Zhizhong Wang

Sever Cercelaru

Beno&icirc;t Butaye

Mihai Murgulescu

A mixer circuit with image frequency rejection comprising a quadrature phase divider (') presenting an input connected to the input (F) of the mixer circuit and two outputs respectively delivering two signals in phase quadrature which are applied respectively to two simple mixers (&#x2032;), said mixer circuit comprising a quadrature phase and frequency divider (&#x2032;) having a frequency division ratio and presenting two inputs respectively connected to the respective outputs of the two simple mixers (&#x2032;) and a first output delivering a first output signal (F) of the mixer circuit, which signal is applied to the inputs of the two simple mixers.

Mixer circuit with image frequency rejection, in particular for an RF receiver with zero or low intermediate frequency

Frequency synthesizer and low-noise frequency synthesizing method

Fractional and rapid response frequency synthesizer, and corresponding frequency synthesizing method

A frequency synthesizer comprising a phase-locked loop that includes a phase-frequency comparator ( ), at least a voltage-controlled oscillator ( ) associated with a selection apparatus ( ) of an oscillation frequency band, and a frequency divider ( ) connected between the oscillator and the comparator. A voltage source proper ( ) is connected to the selection apparatus for supplying it with a control voltage proper.

Low-noise and rapid response frequency synthesizer, and corresponding frequency synthesizing method

An integrated circuit includes at least an inductive element and an active region which may include resistive, capacitive and semiconductor elements. The inductive element and part of the active region are superimposed. The integrated circuit has a screen for insulating the active region with respect to an electromagnetic field that the inductive element develops. The screen allows the implementation of inductive elements having high quality factors in integrated circuits of reduced size and in which the electromagnetic interactions between the inductive elements and the other elements are reduced.

Integrated circuit of inductive elements

Integrated circuit including a low-dispersion capacitive network

The invention relates to an oscillator OSC intended to provide an output signal having a frequency which is variable as a function of a tuning voltage Vtun. The oscillator OSC includes a passive part having two series-arranged variable capacitances Cs, biased by the tuning voltage Vtun, and connected to a power supply VCC via two inductances Lext, and an active part having a first transistor T1 and a second transistor T2 whose collectors are connected to the output terminals C1 and C2 of the passive part, the base of one transistor being connected to the collector of the other transistor via a coupling capacitor Cfb. According to the invention, the passive part includes two high-pass filters, each being inserted between one of the output terminals S1 or S2 and one of the variable capacitances Cs, which allows a reduction of the active part's sensitivity to low-frequency noise.

Integrated oscillator and radio telephone using such an oscillator

Growing community of inventors

Caen, France

Fabrice Jovenin