Patent application number | Description | Published |
20100039180 | AMPLIFYING CIRCUIT - An amplifier having an output stage with a complementary pair of first and second transistors each coupled to an output node of the amplifier; control circuitry arranged to provide a control signal at a control node of the first transistor based on the voltage at an input node of the amplifier; and adjustment circuitry arranged to adjust the control signal to maintain the current through the first transistor above a minimum value. | 02-18-2010 |
20100225379 | ANALOG SWITCH - An analog switch including at least one first MOS transistor capable of transferring a signal from a first terminal to a second terminal; a connection circuit for bringing a substrate terminal of the first transistor to a voltage which is a function of the voltages of the first and second terminals; and a circuit for controlling a control voltage of the first transistor with the signal. | 09-09-2010 |
20110148533 | CRYSTAL OSCILLATOR WITH FAST START-UP AND LOW CURRENT CONSUMPTION - An oscillator comprises an inverter, with a resonator connected between an input and an output of the inverter. A transistor external to the inverter is connected in a current mirror mode with a transistor of the inverter so that the inverter's transistor copies the current of the external transistor. The external transistor has its drain terminal connected to the gate terminals of the inverter's transistor and of the external transistor. A current source is connected to the gate terminal of the inverter's transistor, and a switch is connected between the drain and gate terminals of the external transistor. Circuitry controls the switch so as to open the connection between the drain and gate terminals of the external transistor at the beginning of a start-up phase of the oscillator. | 06-23-2011 |
20130015892 | DOUBLE-POINT MODULATOR WITH ACCURATE AND FAST GAIN CALIBRATIONAANM Badets; FranckAACI VoironAACO FRAAGP Badets; Franck Voiron FRAANM Ramet; SergeAACI JarrieAACO FRAAGP Ramet; Serge Jarrie FRAANM Ayraud; MichelAACI VoreppeAACO FRAAGP Ayraud; Michel Voreppe FR - A phase-locked loop double-point modulator may include a frequency divider having a ratio which can be changed by a first modulation signal, and an oscillator, a frequency of which can be changed by a second modulation signal correlated to the first modulation signal. A calibration circuit may be configured, in a calibration mode, to match the gains of the first and second modulation signals based on frequency measurements of the oscillator for two different calibration values of the second modulation signal. The phase-locked double-point modulator may also include an attenuator having a constant ratio greater than 1 and placed in the path of the second modulation signal, and a selector switch configured to be controlled by the calibration circuit to reduce the ratio of the attenuator in the calibration mode. | 01-17-2013 |
20130088298 | HIGH PERFORMANCE CLASS AB OPERATIONAL AMPLIFIER - A class AB operational amplifier includes an input stage, an output stage and a level shifter stage to control the quiescent current of the output stage and to transfer the signal from the input stage to the output stage, and a control circuit of the level shifter stage. The control circuit includes a transistor differential pair having a differential input terminals and the differential voltage at the differential terminals of the differential pair controls the level shifter stage. | 04-11-2013 |
20130127536 | FULLY DIFFERENTIAL OPERATIONAL AMPLIFIER WITH COMMON-MODE FEEDBACK CIRCUIT - A fully differential operational amplifier includes a differential input stage, at least one output stage and a common-mode feedback circuit connected with the input stage. The differential input stage includes a differential pair of transistors and a bias circuit for the differential pair of transistors. A start-up circuit operates to detect an operating condition of the differential pair of transistors of the input stage and in response thereto turn on the bias circuit. | 05-23-2013 |
20140292411 | HIGH PERFORMANCE CLASS AB OPERATIONAL AMPLIFIER - A class AB operational amplifier includes an input stage, an output stage and a level shifter stage to control the quiescent current of the output stage and to transfer the signal from the input stage to the output stage, and a control circuit of the level shifter stage. The control circuit includes a transistor differential pair having a differential input terminals and the differential voltage at the differential terminals of the differential pair controls the level shifter stage. | 10-02-2014 |