Patent claim: An electronic circuit for amplifying an electrical input signal including a first input component VCORin and a second input component VQUADin which have one and the same period and are in phase quadrature said electronic circuit comprisingan amplifier 2 including a first input terminal and a first output terminal the first input terminal being coupleable to a first input capacitor Ci1 the charge of which varies as a function of said electrical input signala first feedback capacitor Cr1 connected between the first input terminal and the first output terminal of the amplifier 2 anda first switch RESET1 configured to operate alternatively in a first operating mode where it is configured to discharge said first feedback capacitor Cr1 and a second operating mode where it is open said electronic circuit being configured to amplify said electrical input signal as a function of the value of capacitance present between the first input terminal and the first output terminal of the amplifier 2 said electronic circuit further comprisinga first additional capacitor CRES1 anda first coupling circuit RD1 RD2 configured to operate alternatively in a respective first operating modewhere it connects the first additional capacitor CRES1 in parallel to the first feedback capacitor Cr1 and in a respective second operating mode where it decouples the first additional capacitor CRES1 from the first feedback capacitor Cr1and wherein said first switch RESET1 is configured to switch from the first operating mode to the second operating mode at a first instant t2 in which one VCORin of the first and second input components VCORin VQUADin assumes a first zero value and in which the other VQUADin of said first and second input components VCORin VQUADin assumes a nonzero value in such a way that following upon said first instant t2 the amplifier 2 generates an electrical output signal including a first output component VCORout and a second output component VQUADout which are a function of the first and second input components VCORin VQUADinrespectively the output component VQUADout that is a function of said other VQUADin of said first and second input components VCORin VQUADin differing at said first instant t2 from a corresponding first ideal value said first ideal value being a function of said nonzero value and of a steadystate gain value equal to the gain of said electronic circuit when the first switch RESET1 and the first coupling circuit RD1 RD2 operate in the respectivesecond operating mode and wherein the first coupling circuit RD1 RD2 is configured to carry out a switching from the respective first operating mode to the respective second operating mode in a way synchronous with a second instant t3 which is at a distance in time from the first instant t2 that is half of said period and in which said one VCORin of the first and second input components VCORin VQUADin assumes a second zero value in such a way that following upon said switching said electronic circuit amplifies both the first input component VCORin and the second input component VQUADin with a gain equal to said steadystate gain value and wherein the first coupling circuit RD1 RD2 is further configured to operate between said first instant t2 and said switching in such a way that when said switching takes place the output component VQUADout that is a function of said other VQUADin of said first and second input components VCORin VQUADin is equal to a corresponding second ideal value said second ideal value being a function of said steadystate gain value and of the value assumed by said other VQUADin of said first and second input components VCORin VQUADin when said switching takes place.

Related passage: The sensing mass 8 is drawn in motion along the driving axis X by the driving mass 7.Consequently when the microstructure 2 rotates about a gyroscopic axis perpendicular to the plane of the axes X Y with a certain instantaneous angular velocitythe sensing mass 8 is subject to a Coriolis force which is parallel to the sensing axis Y and is proportional to the angular velocityof the microstructure 2 and to the velocity of the two masses 7 8 along the driving axis X.More precisely the Coriolis force FC is given by the equation FC2MSx where MS is the value of the sensing mass 8is the angular velocity of the microstructure 2 and x is the velocity of the two masses 7 8 along the driving axis X.The velocity x varies sinusoidally at the driving frequency D with a phase shift of 90 with respect to the position x along the driving axis X and amplitude that are substantially constant as the temperature varies the variations are usually less than 1.The displacements to which the sensing mass 8 is subject on account of the Coriolis force are read through the signal sensing units 15 Figure 3 and the reading device 5.In response to the excitation of the sensing mass 8 by the reading signal VRthe signal sensing units 15 transfer to the charge amplifier 32 differential sensing charge packets QRS1 QRS2 which are proportional to the capacitive unbalancing caused by the displacement of the sensing mass 8 along the sensing axis Y.The sensing charge packets QRS1 QRS2 are hence correlated to the Coriolis force and to the instantaneous angular velocityof the microstructure 2.The sensing charge packets QRS1 QRS2 are converted and processed by the reading device 5 for generating the reading signal SOUT which indicates the angular velocitysee also Figure 5.