Abstract: A linear regulator is disclosed, comprising: a transistor having a control terminal, a first main terminal being a supply terminal connected to a supply input, and a second main terminal being an output terminal configured to provide a regulated output at an output connection; an error amplifier having a reference input, a feedback input and an output connected to the control terminal; a reference current source; a reference circuit configured to provide a reference voltage to the reference input from the reference current source; and a feedback circuit from the second main terminal through a feedback resistance (Rfb) and configured to provide a feedback voltage to the feedback input of the error amplifier; wherein the feedback circuit and the reference circuit include a common resistance (Rtail, Rd3), and at least one of the reference circuit and the reference circuit comprises a capacitive path (Cref) to a ground.

Abstract: A linear regulator is disclosed, comprising: a transistor having a control terminal, a first main terminal being a supply terminal connected to a supply input, and a second main terminal being an output terminal configured to provide a regulated output at an output connection; an error amplifier having a reference input, a feedback input and an output connected to the control terminal; a reference current source; a reference circuit configured to provide a reference voltage to the reference input from the reference current source; and a feedback circuit from the second main terminal through a feedback resistance (Rfb) and configured to provide a feedback voltage to the feedback input of the error amplifier; wherein the feedback circuit and the reference circuit include a common resistance (Rtail, Rd3), and at least one of the reference circuit and the reference circuit comprises a capacitive path (Cref) to a ground.

Abstract: A programmable variable admittance circuit may be used in a programmable filter or a variable gain amplifier in a number of different applications including tuners and other RF receiver circuits. A variable admittance circuit and operation is described including a number of switchable admittance elements arranged in parallel branches. The variable admittance circuit requires fewer transitions to change between successive admittance values than a binary weighted circuit and fewer branches for implementation then a thermometry admittance circuit.

Abstract: A programmable variable admittance circuit may be used in a programmable filter or a variable gain amplifier in a number of different applications including tuners and other RF receiver circuits. A variable admittance circuit and operation is described including a number of switchable admittance elements arranged in parallel branches. The variable admittance circuit requires fewer transitions to change between successive admittance values than a binary weighted circuit and fewer branches for implementation then a thermometry admittance circuit.

Abstract: The invention relates to a tuner for converting a radio frequency signal into an intermediate frequency signal, said tuner comprising a voltage converter supplying a control signal, a mixer associated with an oscillator which is voltage-controlled by said control signal. The invention is characterized in that said voltage converter comprises: an auto-oscillating circuit generating an alternating voltage signal of a variable level, rectifying means for supplying a direct voltage signal of a variable level based on said alternating voltage signal of a variable level, an additional circuit for reducing the variations of the attenuation coefficient of said auto-oscillating circuit, said additional circuit receiving said direct voltage signal of a variable level and supplying said control signal. The invention provides an inexpensive solution having an improved performance in terms of spectral purity, ease of implementation and stability of control of said intermediate frequency signal.

Abstract: This invention relates to a regulating system for regulating, with respect to a reference level (Vref), the level of an amplified signal (108), said regulating system comprising: -attenuation means (201) for generating an attenuated signal (202) from said amplified signal (108) according to a programmable attenuation factor, -conversion means (203) for converting said attenuated signal (202) in order to generate an output signal (204) intended to be compared with said reference level (Vref).

Abstract: The invention relates to a tuner for converting a radio frequency signal into an intermediate frequency signal, said tuner comprising a voltage converter supplying a control signal, a mixer associated with an oscillator which is voltage-controlled by said control signal.