Koninklijke Philips Corporation N.V.

Ams Ag

Nigel Greer

Matthias Steiner

A transconductor circuitry () with adaptive biasing comprises a first input terminal (E) to apply a first input signal (inp), and a second input terminal (E) to apply a second input signal (inn). A control circuit () is configured to control a first controllable current source () in a first current path () and a second controllable current source () in a second current path () in response to at least one of a first potential of a first node (N) of the first current path () and a second potential of a second node (N) of the second current path (). The first node (N) is located between a first transistor () and the first controllable current source (), and the second node (N) is located between a second transistor () and the second controllable current source ().

Transconductor circuitry with adaptive biasing

A radiotelephony device employing filters and methods for eliminating a DC component from an electronic signal provide for circuitry having a zero corresponding to a cut-off frequency, and circuitry for shifting the zero by an amount corresponding to the absolute value of that cut-off frequency. In such radiotelephony device, the filters and methods, which include integration and operation of gyrators, tend to be (a) suited for incorporation in integrated circuits by virtue of reducing the physical size of the required capacitors and (b) reduce time-dependent inertia.

Method of eliminating a DC component and filtering device obtained by this method

The invention relates to a method of demodulating a signal (I, Q) that has a main component and harmonics. According to the invetion, this method includes the following of a selection of one of the harmonics, and a demodulation of the selected harmonic. The invention enables the elimination of a parasitic component introduced by the demodulation into the demodulated signal SD without altering the data carried by the signal SD.

Demodulation method preserving a high spectral purity

Filters and methods for eliminating a DC component from an electronic signal provide for circuitry having a zero corresponding to a cut-off frequency, and circuitry for shifting the zero by an amount corresponding to the absolute value of that cut-off frequency. The filters and methods, which include integration and operation of gyrators, are particularly well-suited for incorporation in integrated circuits by virtue of reducing the physical size of the required capacitors. A further advantage is the reduction of time-dependent inertia. Applications of the filters and methods include, but are not limited to, radiotelephony.

Growing community of inventors

Hottot les Bagues, France

Nigel Greer