Stmicroelectronics S.a.

Centre National De La Recherche Scientifique

Stephane Razafimandimby

Andreia Cathelin

Didier Belot

Jean-François Carpentier

Cyrille Tilhac

Andreas Kaiser

A controlled oscillator includes, connected in parallel, a capacitor configured to be tuneable based upon a first signal, an inductor, and an active impedance. The active impedance is formed by a pair of cross-coupled transistors connected so as to produce a negative resistive component at the terminals of the active impedance. Circuitry produces a degeneracy tuneable by a second signal in the cross-coupled pair, such that the cross-coupled pair produces a capacitive component tuneable based upon the second signal at the terminals of the active impedance.

Multiband voltage controlled oscillator without switched capacitor

A lattice tunable filtering circuit includes a first input and a second input, and a first output and a second output. The circuit includes two series branches and two parallel branches. The first and second series branches include a Tunable Resonator Component (TRC) which presents a first series resonance frequency whereas the third and fourth parallel branches present a second series resonance frequency which has a value being lower than that of the first series resonance frequency. The first and second series resonance frequencies are tunable by one analog control quantity. The filtering circuit further includes a feedback control loop for the control of the analog quantity, which feedback is based on a criterion of equality between the modulus of impedances Zs and Zp.

Frequency tuning circuit for lattice filter

A negative capacitances circuit includes first and second branches connected between a first reference voltage and a second reference voltage. The first branch includes, in series, a first biasing resistor, a first diode, a first bipolar transistor, and a first current source. The second branch includes, in series, a second biasing resistor, a second diode, a second bipolar transistor, and a second current source. The first transistor has a base coupled to a collector of the second transistor and to one input, and the second transistor has a base coupled to a collector of the first transistor and to another input. A capacitor is connected between the emitter of said first transistor and the emitter of said second transistor. A linearization resistor is coupled in parallel between the two emitters of said first and said second transistors.

Negative capacity circuit for high frequencies applications

An electronic circuit includes: an acoustic resonator of BAW or SAW type, said resonator having a series resonance frequency and a parallel resonance frequency; an active circuit which is coupled in parallel to said acoustic resonator, said active circuit having a negative capacity acting on the parallel resonance frequency of said resonator.

Integrated electronic circuitry comprising tunable resonator

An electronic circuit comprises a resonator meant to be integrated into a semiconductor product including a resonator having first and second resonant frequencies. The electronic circuit comprises: a first inductive partner element for canceling out said second resonant frequency, said partner element having a quality coefficient QI (f) having a first value in a predetermined frequency band and a second value outside said frequency band; a second capacitive partner element for adjusting tuning of said resonator to said first frequency.

Electronic circuit comprising a resonator to be integrated into a semiconductor product

An amplitude-locked loop (ALL) includes: a comparator circuit having a first input, a second input and an output, said first input receiving an electric reference signal; a loop filter having an input connected to said output of said comparator circuit and having an output generating an electric control signal (Vtune); a circuit generating an electric signal to be controlled, transmitted to said second input of said comparator circuit. The circuit comprises an acoustic resonator having a BAW-type resonator having a first and second resonant frequencies and associated with a first inductive partner element for removing said second resonant frequency and with a second capacitive partner element for tuning said first resonant frequency, said at least first resonator component being adjustable via said electric control signal (Vtune).

Integrable amplitude-locked loop including an acoustic resonator

An integrated electronic circuit comprises at least first and second variable resonator elements that can be tuned by means of an electric signal (V) and that are arranged on the same silicon substrate, and that are respectively integrated into a Master circuit and a Slave circuit. Each resonator element is associated with a first inductive partner element set in the vicinity of the resonant and antiresonant frequencies; and with a second capacitive partner element, at least one of said partner elements being adjustable by means of said electric signal (V). Controlling both partner elements could be done either by means of an adjustable capacitor, as a varactor, or by means of an inductor, passive or active, fixed or variable.

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Grenoble, France

Stephane Razafimandimby